Assalamaualaikum & Salam Satu Malaysia.
Saya ucapkan selamat kembali semula ke sekolah kepada semua pelajar. Bagi pelajar2 ting 3 dan 5 selamat menduduki peperiksaan PMR dan SPM yang tak berapa lama lagi....
Jumaat, 17 September 2010
Rabu, 8 September 2010
Experimental Design Diagrams
Name: Alex, Josie, and Kendra HR: 7
Bottle Rockets...
The Distance the Rocket goes Depends on The Amount of Water
Source: Kendra, Alex, and Josie May 2009
HYPOTHESIS:
If we have more water, then it will go the farthest, because it will have more pressure and more weight.
A. List 5 controlled variables.
The rocket, the type of launch pad, the angle of the launch, the amount of water in the nose cone (1 cup), the time, the number of wings (4)...
INDEPENDENT VARIABLE: Amount of water in the bottom/body of rocket
DEPENDENT VARIABLE: Distance of rocket.
PROCEDURES:
1. Make the rocket.
2. Change amount of water in the body and record.
3. See if hypothesis is correct.
Write a one sentence summary of your experiment results here: Our hypothesis was partially correct. I think there were many errors with the wind but more water makes it go farther.
Bottle Rockets...
The Distance the Rocket goes Depends on The Amount of Water
| Amount of Water (cups) | Distance of Rocket (in meters) | |||||
| Trial 1 | Trial 2 | Trial 3 | AVERAGE Distance (m) | |||
| 1 (Controlled) | 46 | 42 | 45 | 44.3 | ||
| 2 | 65 | 63 | 58 | 62 | ||
| 3 | 54 | 48 | 51 | 51 |
Source: Kendra, Alex, and Josie May 2009
HYPOTHESIS:
If we have more water, then it will go the farthest, because it will have more pressure and more weight.
A. List 5 controlled variables.
The rocket, the type of launch pad, the angle of the launch, the amount of water in the nose cone (1 cup), the time, the number of wings (4)...
INDEPENDENT VARIABLE: Amount of water in the bottom/body of rocket
DEPENDENT VARIABLE: Distance of rocket.
PROCEDURES:
1. Make the rocket.
2. Change amount of water in the body and record.
3. See if hypothesis is correct.
Write a one sentence summary of your experiment results here: Our hypothesis was partially correct. I think there were many errors with the wind but more water makes it go farther.
Selasa, 7 September 2010
The Effect of Fin Area and Amount vs. Altitude of Water Rocket
Special thanks to the author for this experiment.....
PURPOSE
The purpose of this experiment was to determine if the area of the fins and the number of fins would affect a rocket’s performance or altitude, which the rocket reached. I became interested in this idea while pondering if number of fins would affect the altitude of rockets that I launch, I also enjoy rocketry and thought it would be fun to put my question to the test. The information gained from this experiment can lead scientists and rocketers alike to make aerodynamic fins and to increase the performance of rockets without adding more fuel or using a larger engine.
HYPOTHESIS
My first hypothesis was that the rocket that contains 3 fins with a small surface area would reach the highest altitude. I based my hypothesis on information and data gathered from the Handbook of Model Rocketry and World Book Encyclopedia that summarizes that drag should be reduced by surface area.
My second hypothesis was that the rocket situated with 5 large fins would have the lowest altitude. I based my hypothesis on information and data gathered from the Handbook of Model Rocketry and World Book Encyclopedia that summarizes that drag should be reduced by surface area.
EXPERIMENT DESIGN
The constants in this study were:
* The type of rocket used
* The size of the pop bottle
* The shape of the pop bottle
* The volume of the pop bottle
* The amount of water in the pop bottle
* The pressure inside the pop bottle
* The shape of the rocket
* The recovery device
* The shape of the rocket’s nose cone
* The height of the rocket
* The width of the rocket
* The weight of the rocket (may change a little due to number and size of fins)
* The same launcher
* The same launch pad
* The same launch device
* The same weather conditions
* The shape of the fins so the fins are proportional
* The airfoil of the fins (Square shaped airfoil)
The manipulated variable was the number of fins (3, 4, and 5) and the area of the fins.
The responding variable was the altitude of which the rocket reached at apogee. To measure the responding variable, Estes, Alti-trak was used to measure the altitude of the rocket at apogee in meters.
Below is a table of the different treatments.
3, small fins 4, small fins 5, small fins
3, medium fins 4, medium fins 5, medium fins
3, large fins 4, large fins 5, large fins
MATERIALS
QUANTITY ITEM DESCRIPTION
1 Pitsco pop bottle Water Rocket
N/A Water
1 Pitsco launcher
1 Sheet of 1/16" by 3" by 36" Balsa wood
1 Sheet of 1/16" by 6" by 36" Balsa wood
1 Estes Altitrak (a rocket altitude measuring device)
1 X-Acto Knife
1 Cool Melt Glue Gun
1 Bottle of White or yellow Glue
1 Tube of plastic cement
N/A Sand paper
1 Pitsco Pressure pump
PROCEDURES
1. The first step is to construct the rocket you are using, but don’t add any fins yet. Mark on the rocket where the 3, 4, and 5 different fins will be (use one mark for a central point for the other marks). Then I labeled them as follows:
The 3 fins marks are A, B, and C these fins are spaced 120 degrees apart
The 4 fins marks are C1, C2, C3, and C4 these fins are spaced 90 degrees apart
The 5 fins marks are 1, 2, 3, 4, and 5 and these fins are spaced 72 degrees apart.
Construction Tip: for porous materials like paper, cardboard, and balsa wood put glue on the material then let it sit for a while to let the glue sink into the pours. Then put on more glue and fit the pieces together.
2. The next step is to make a template of the different fins you are using. You can make the templates by cutting out cardboard that is the same sizes as the fins.
3. The next step is to trace an outline of the fins on the sheet balsa wood with the templates. The fins can be any shape you want, but make sure all fins are the same size and proportional. I used a trapezoid shaped fin.
4. Then cut out the fins with an X-Acto Knife.
5. Next take the fins of the same size and hold them even in your hand. Sand all edges (not the sides) so the rough edge is removed and all of the fins are the same precise size. Caution: Don’t sand the fins too much because you will change their size the more you sand them.
6. Next step is to glue on 5, large fins to the rocket with the cool melt glue gun. Construction Tip: Use the glue sparingly because you want to easily remove the fins from the rocket to put on new fins.
7. Now launch the rocket 3 times and record the data. Note: Follow instructions provided with the kit on how to launch the rocket. Note: Use the exact same amount of water for each launch.
8. Cut off the fins of the rocket with the X-Acto Knife and sand the root where the fin was glued so that the body tube was like nothing was ever glued to it.
9. Repeat steps 7-9 for all of the fins and make sure the weather conditions are approximately the same for all launches.
RESULTS
The original purpose of this experiment was to determine if the difference in the area and number of fins would change the altitude of the rocket. The results of the experiment were the rocket with 4 medium fins had the highest average altitude and the rocket with 5 large fins had the lowest average altitude.
CONCLUSION
My first hypothesis was that the rocket that contains 3 fins with a small surface area would reach the highest altitude. The results indicate that this hypothesis should be rejected. My second hypothesis was that the rocket situated with 5 large fins would have the lowest altitude. The results indicate that this hypothesis should be accepted. Because of the results of this experiment, I wonder if the reason the rockets that had 3 fins and the rocket that had 4 small fins didn’t go higher than the rocket with 4 medium fins is because the area didn’t matter from that point on and the stability of them wasn’t as good as the rocket with 4 medium fins.
If I were to conduct this project again I would have more trials for more accurate data, I would try to find a better and more accurate way to measure the altitude, and then if I find a better way to find the altitude I could use solid fuel rockets.
Research Report
Rocket
A rocket is an engine that is used to propel a vehicle at an extremely fast speed. A rocket engine the same size as a medium sized automobile engine will produce almost three thousand times the power. Rockets can range from just a couple feet tall (61 centimeters) to almost 380 feet (115 meters). Rockets are called chemical rockets if they burn fuel to produce their power. There are some experiments with rockets that use heat to make their fuel expand causing thrust. Although chemical rockets do burn fuel rapidly they produce an extremely large amount of thrust. The Saturn 5 rocket engine used 1,018,181.8 gallons (3,853,100 liters) of fuel to power itself for just five minutes. The temperature in some rockets can reach 6,000 degrees Fahrenheit (3316 degrees Celsius) or more!
The main purposes for which people use rockets today are research, space travel, and military strikes with warheads. Ancient civilizations used rockets with explosives attached to blow up enemy encampments. Rockets lately have been used for researching space as well as to transport warheads on military missiles. The use of rockets for exploration and research has been during only the past 50 years and has opened a new window for exploring space. The satellites that rockets carry into space can take pictures, record data of the universe, and track weather.
Rockets work on one of Newton’s laws, "For every action there is an equal and opposite reaction". In this case rockets burn a special fuel in a combustion chamber and create pressure that has only one direction to go. This direction of the pressure is out of the nozzle on the bottom of the rocket, the great pressure of the rapidly expanding gas causes an action of pressure on the ground. The opposite action is the rocket moving in the opposite direction. Some experiments have been tried with other rockets powered by nuclear power, but researchers have found that this doesn’t provide as much energy. Some small rockets used for recreation also use-pressurized air and water in a sealed compartment.
Model Rocket
Model rockets are the counterparts of full size rockets. These small rockets are mainly used for research and recreation. They are a lot cheaper than the rockets at Cape Canaveral and they only weigh 31/2 pounds (1.5 kilograms) or less. These rockets are only about 8-24inches (20-40 centimeters). All model rocket engines use solid fuel (or water and air pressure on water rockets.) Model rockets can reach 2000 feet (610 meters) in altitude in a few seconds because the rockets can travel at speeds of 300 mph (480 kph).
Aerodynamics
Aerodynamics is the study of how forces act on an object as it moves trough a fluid. Aerodynamic forces act on airplanes, sailboats, motorboats, submarines, cars, rockets, busses, and anything that moves through a liquid or gas. Scientists and engineers study these aerodynamic forces for a way to prevent them from hindering the performance (affecting the best operation) of the machine (like oil lubricates gears so there is less friction). These aerodynamic forces affect the movement of the object in many ways and how fast it can travel. The Wright Brothers had to understand aerodynamics before they could succeed in building the first aircraft. Today aircraft manufacturers use the same principles to make their aircraft fly the fastest with the cheapest engine. These principles also affect engineers and architects and the structures that they design with the way the air flows around a building or bridge.
Drag is the main force that affects moving objects. This force resists movement of objects in motion. The shape of the object influences the amount of drag. Although drag cannot be eliminated it can be reduced. Objects shaped to produce the littlest amount of drag possible are called a streamlined or aerodynamically clean object. Aircraft designers design planes that produce the least amount of drag possible because planes with low drag need less engine power to fly at the same speed. Automobiles, trucks, planes, trains, rockets, boats and all other vehicles in motion encounter or are affected by drag. There are two types of drag that exist that affect all moving objects, friction drag and form drag. There is a third type of drag called induced drag, but it only affects objects that create lift. There is still another drag that affects aircraft and other objects going faster than the speed of sound.
Friction drag occurs next to the surface of an object and is produced in a thin layer of air called the boundary layer. The friction results when one layer of fluid slides over another layer of fluid. Molecules of air in the boundary layer either have an ordinary path parallel to the surface or an irregular path. Engineers call an ordinary path laminar flow and an irregular path turbulent flow. A turbulent flow increases friction drag. The boundary layer usually has a laminar flow, but the airflow can become turbulent at some point as the air moves along the abject. Aircraft designers try to delay the change of laminar flow to turbulent flow for as long as possible to reduce the friction drag.
Form drag occurs when the airflow past an object breaks away from the object. This type of drag produces swirling eddies that takes energy from an object that slows it down. Form drag occurs with non-streamlined objects like a large semi truck at a high speed. The driver may experience a rough ride due to the eddies from the non-streamlined truck. To stop this occurring to aircraft, which need to fly fast, airline companies put vortex generators on an airplane’s wing, which keep the boundary layer from breaking away from the wing. They are small devices that are shaped like airfoils that stick up along the top of the main wing in rows. The vortex generators produce small disturbances in the boundary layer that keeps the air from breaking away.
BIBLIOGRAPHY
Cliff, Eugene M. "Rocket," World Book Encyclopedia. 1999. Volume R, #16. Pg. 384-391
Estes Industries "Beginners Guide to Model Rocketry"
Heimber, Charles H. and Price, Jack. Focus on Physical Science. Merrill Publishing Company 1987. Pg. 12-27
Miller, Patrick J. "Rocket, Model," World Book Encyclopedia. 1999. Volume R, #16. Pg. 391-393
Platkin, Allen. "Aerodynamics," World Book Encyclopedia. 1999. Volume A, #1. Pg. 85-88
Stine, G. Harry. Handbook of Model Rocketry. John Wiley & Sons Inc. 1994. Pg. 2-9
________________________________________
ACKNOWLEDGEMENTS
This science project couldn’t have been possible without the help and assistance of several people. I would like to thank and acknowledge each of them for their help.
My father for devoting lots of time and effort even though I procrastinated he still helped me to the finish.
My mother for helping me to right my journal and give me support.
Mr. Kenneth Newkirk for not only helping me, but the rest of the class in completing their science projects, even when he had more important things to do.
________________________________________
PURPOSE
The purpose of this experiment was to determine if the area of the fins and the number of fins would affect a rocket’s performance or altitude, which the rocket reached. I became interested in this idea while pondering if number of fins would affect the altitude of rockets that I launch, I also enjoy rocketry and thought it would be fun to put my question to the test. The information gained from this experiment can lead scientists and rocketers alike to make aerodynamic fins and to increase the performance of rockets without adding more fuel or using a larger engine.
HYPOTHESIS
My first hypothesis was that the rocket that contains 3 fins with a small surface area would reach the highest altitude. I based my hypothesis on information and data gathered from the Handbook of Model Rocketry and World Book Encyclopedia that summarizes that drag should be reduced by surface area.
My second hypothesis was that the rocket situated with 5 large fins would have the lowest altitude. I based my hypothesis on information and data gathered from the Handbook of Model Rocketry and World Book Encyclopedia that summarizes that drag should be reduced by surface area.
EXPERIMENT DESIGN
The constants in this study were:
* The type of rocket used
* The size of the pop bottle
* The shape of the pop bottle
* The volume of the pop bottle
* The amount of water in the pop bottle
* The pressure inside the pop bottle
* The shape of the rocket
* The recovery device
* The shape of the rocket’s nose cone
* The height of the rocket
* The width of the rocket
* The weight of the rocket (may change a little due to number and size of fins)
* The same launcher
* The same launch pad
* The same launch device
* The same weather conditions
* The shape of the fins so the fins are proportional
* The airfoil of the fins (Square shaped airfoil)
The manipulated variable was the number of fins (3, 4, and 5) and the area of the fins.
The responding variable was the altitude of which the rocket reached at apogee. To measure the responding variable, Estes, Alti-trak was used to measure the altitude of the rocket at apogee in meters.
Below is a table of the different treatments.
3, small fins 4, small fins 5, small fins
3, medium fins 4, medium fins 5, medium fins
3, large fins 4, large fins 5, large fins
MATERIALS
QUANTITY ITEM DESCRIPTION
1 Pitsco pop bottle Water Rocket
N/A Water
1 Pitsco launcher
1 Sheet of 1/16" by 3" by 36" Balsa wood
1 Sheet of 1/16" by 6" by 36" Balsa wood
1 Estes Altitrak (a rocket altitude measuring device)
1 X-Acto Knife
1 Cool Melt Glue Gun
1 Bottle of White or yellow Glue
1 Tube of plastic cement
N/A Sand paper
1 Pitsco Pressure pump
PROCEDURES
1. The first step is to construct the rocket you are using, but don’t add any fins yet. Mark on the rocket where the 3, 4, and 5 different fins will be (use one mark for a central point for the other marks). Then I labeled them as follows:
The 3 fins marks are A, B, and C these fins are spaced 120 degrees apart
The 4 fins marks are C1, C2, C3, and C4 these fins are spaced 90 degrees apart
The 5 fins marks are 1, 2, 3, 4, and 5 and these fins are spaced 72 degrees apart.
Construction Tip: for porous materials like paper, cardboard, and balsa wood put glue on the material then let it sit for a while to let the glue sink into the pours. Then put on more glue and fit the pieces together.
2. The next step is to make a template of the different fins you are using. You can make the templates by cutting out cardboard that is the same sizes as the fins.
3. The next step is to trace an outline of the fins on the sheet balsa wood with the templates. The fins can be any shape you want, but make sure all fins are the same size and proportional. I used a trapezoid shaped fin.
4. Then cut out the fins with an X-Acto Knife.
5. Next take the fins of the same size and hold them even in your hand. Sand all edges (not the sides) so the rough edge is removed and all of the fins are the same precise size. Caution: Don’t sand the fins too much because you will change their size the more you sand them.
6. Next step is to glue on 5, large fins to the rocket with the cool melt glue gun. Construction Tip: Use the glue sparingly because you want to easily remove the fins from the rocket to put on new fins.
7. Now launch the rocket 3 times and record the data. Note: Follow instructions provided with the kit on how to launch the rocket. Note: Use the exact same amount of water for each launch.
8. Cut off the fins of the rocket with the X-Acto Knife and sand the root where the fin was glued so that the body tube was like nothing was ever glued to it.
9. Repeat steps 7-9 for all of the fins and make sure the weather conditions are approximately the same for all launches.
RESULTS
The original purpose of this experiment was to determine if the difference in the area and number of fins would change the altitude of the rocket. The results of the experiment were the rocket with 4 medium fins had the highest average altitude and the rocket with 5 large fins had the lowest average altitude.
CONCLUSION
My first hypothesis was that the rocket that contains 3 fins with a small surface area would reach the highest altitude. The results indicate that this hypothesis should be rejected. My second hypothesis was that the rocket situated with 5 large fins would have the lowest altitude. The results indicate that this hypothesis should be accepted. Because of the results of this experiment, I wonder if the reason the rockets that had 3 fins and the rocket that had 4 small fins didn’t go higher than the rocket with 4 medium fins is because the area didn’t matter from that point on and the stability of them wasn’t as good as the rocket with 4 medium fins.
If I were to conduct this project again I would have more trials for more accurate data, I would try to find a better and more accurate way to measure the altitude, and then if I find a better way to find the altitude I could use solid fuel rockets.
Research Report
Rocket
A rocket is an engine that is used to propel a vehicle at an extremely fast speed. A rocket engine the same size as a medium sized automobile engine will produce almost three thousand times the power. Rockets can range from just a couple feet tall (61 centimeters) to almost 380 feet (115 meters). Rockets are called chemical rockets if they burn fuel to produce their power. There are some experiments with rockets that use heat to make their fuel expand causing thrust. Although chemical rockets do burn fuel rapidly they produce an extremely large amount of thrust. The Saturn 5 rocket engine used 1,018,181.8 gallons (3,853,100 liters) of fuel to power itself for just five minutes. The temperature in some rockets can reach 6,000 degrees Fahrenheit (3316 degrees Celsius) or more!
The main purposes for which people use rockets today are research, space travel, and military strikes with warheads. Ancient civilizations used rockets with explosives attached to blow up enemy encampments. Rockets lately have been used for researching space as well as to transport warheads on military missiles. The use of rockets for exploration and research has been during only the past 50 years and has opened a new window for exploring space. The satellites that rockets carry into space can take pictures, record data of the universe, and track weather.
Rockets work on one of Newton’s laws, "For every action there is an equal and opposite reaction". In this case rockets burn a special fuel in a combustion chamber and create pressure that has only one direction to go. This direction of the pressure is out of the nozzle on the bottom of the rocket, the great pressure of the rapidly expanding gas causes an action of pressure on the ground. The opposite action is the rocket moving in the opposite direction. Some experiments have been tried with other rockets powered by nuclear power, but researchers have found that this doesn’t provide as much energy. Some small rockets used for recreation also use-pressurized air and water in a sealed compartment.
Model Rocket
Model rockets are the counterparts of full size rockets. These small rockets are mainly used for research and recreation. They are a lot cheaper than the rockets at Cape Canaveral and they only weigh 31/2 pounds (1.5 kilograms) or less. These rockets are only about 8-24inches (20-40 centimeters). All model rocket engines use solid fuel (or water and air pressure on water rockets.) Model rockets can reach 2000 feet (610 meters) in altitude in a few seconds because the rockets can travel at speeds of 300 mph (480 kph).
Aerodynamics
Aerodynamics is the study of how forces act on an object as it moves trough a fluid. Aerodynamic forces act on airplanes, sailboats, motorboats, submarines, cars, rockets, busses, and anything that moves through a liquid or gas. Scientists and engineers study these aerodynamic forces for a way to prevent them from hindering the performance (affecting the best operation) of the machine (like oil lubricates gears so there is less friction). These aerodynamic forces affect the movement of the object in many ways and how fast it can travel. The Wright Brothers had to understand aerodynamics before they could succeed in building the first aircraft. Today aircraft manufacturers use the same principles to make their aircraft fly the fastest with the cheapest engine. These principles also affect engineers and architects and the structures that they design with the way the air flows around a building or bridge.
Drag is the main force that affects moving objects. This force resists movement of objects in motion. The shape of the object influences the amount of drag. Although drag cannot be eliminated it can be reduced. Objects shaped to produce the littlest amount of drag possible are called a streamlined or aerodynamically clean object. Aircraft designers design planes that produce the least amount of drag possible because planes with low drag need less engine power to fly at the same speed. Automobiles, trucks, planes, trains, rockets, boats and all other vehicles in motion encounter or are affected by drag. There are two types of drag that exist that affect all moving objects, friction drag and form drag. There is a third type of drag called induced drag, but it only affects objects that create lift. There is still another drag that affects aircraft and other objects going faster than the speed of sound.
Friction drag occurs next to the surface of an object and is produced in a thin layer of air called the boundary layer. The friction results when one layer of fluid slides over another layer of fluid. Molecules of air in the boundary layer either have an ordinary path parallel to the surface or an irregular path. Engineers call an ordinary path laminar flow and an irregular path turbulent flow. A turbulent flow increases friction drag. The boundary layer usually has a laminar flow, but the airflow can become turbulent at some point as the air moves along the abject. Aircraft designers try to delay the change of laminar flow to turbulent flow for as long as possible to reduce the friction drag.
Form drag occurs when the airflow past an object breaks away from the object. This type of drag produces swirling eddies that takes energy from an object that slows it down. Form drag occurs with non-streamlined objects like a large semi truck at a high speed. The driver may experience a rough ride due to the eddies from the non-streamlined truck. To stop this occurring to aircraft, which need to fly fast, airline companies put vortex generators on an airplane’s wing, which keep the boundary layer from breaking away from the wing. They are small devices that are shaped like airfoils that stick up along the top of the main wing in rows. The vortex generators produce small disturbances in the boundary layer that keeps the air from breaking away.
BIBLIOGRAPHY
Cliff, Eugene M. "Rocket," World Book Encyclopedia. 1999. Volume R, #16. Pg. 384-391
Estes Industries "Beginners Guide to Model Rocketry"
Heimber, Charles H. and Price, Jack. Focus on Physical Science. Merrill Publishing Company 1987. Pg. 12-27
Miller, Patrick J. "Rocket, Model," World Book Encyclopedia. 1999. Volume R, #16. Pg. 391-393
Platkin, Allen. "Aerodynamics," World Book Encyclopedia. 1999. Volume A, #1. Pg. 85-88
Stine, G. Harry. Handbook of Model Rocketry. John Wiley & Sons Inc. 1994. Pg. 2-9
________________________________________
ACKNOWLEDGEMENTS
This science project couldn’t have been possible without the help and assistance of several people. I would like to thank and acknowledge each of them for their help.
My father for devoting lots of time and effort even though I procrastinated he still helped me to the finish.
My mother for helping me to right my journal and give me support.
Mr. Kenneth Newkirk for not only helping me, but the rest of the class in completing their science projects, even when he had more important things to do.
________________________________________
Selamat Menyambut hari Raya AidilFitri
Kepada peminat2 roket air, saya mengucapkan selamat menyambut hari raya aidil fitri yang bakal tiba nanti. Saya sekarang sedang bercuti di Terengganu sehingga 16/9. Sebarang tempahan pelancar roket air hanya dapat disiapkan/dihantar selepas tarikh tersebut.
harap maklum..
Tq
harap maklum..
Tq
Isnin, 6 September 2010
Power point slide show
Satu penerangan yang menarik dari 'Quasar the Areo Club' berkaitan dengan teori penerbangan dan roket air sila klik pautan di bawah untuk memuat turun dan mengetahui dengan lebih lanjut
Power point slide show
tq
Power point slide show
tq
Ahad, 5 September 2010
Double Rocket
Double Rocket
The first advanced project is a double pressure chamber. This double rocket is a 3-liter pressure chamber. Two 1.5 liter bottles are joined by a small tyre valve rod. I found several versions of these plans online, but the best, and I suppose the original plans should be credited as "The Robinson Coupling". The hardest part of this project is sealing the joint where the couple is located. The air pressure inside the container needs to hold at 60 -100 psi. I still looking the best sealent/glue that can be used to avoid air from coming out from the the joint where the couple is located. So far I have found that Sally glue (can get from GIANT store) is flexible and strong enough to hold the seal. Be patient, the adhesive needs at least 24 hours to cure. Don't pressure test until then. But that glue still cannot hold the pressure up to 100 psi. I still looking the suitable glue to solve this problem.
The coupler can be made one of two ways. Either by joining bottom to bottom, or bottom to top. I will describe the joining bottom to top because it is easy to do it compare the joining bottom to bottom.
PARTS LIST:
(1) Tyre valve
(3) Nuts
(2) rubber Washers (can made from bicycle tube)
(1) 1.5 liter bottle cap
Teflon tape
Building the "Valve Coupler"
Start by carefully drilling a small hole in the bottom of the 2-liter pressure chamber and the bottle cap. The tyre valve should just barely fit into the holes. Be careful not to remove the blue plastic gasket at the bottom of the bottle cap. (It will help seal the joint in the end.) Dry fit all parts to make sure it will work before you go any further.
Wrap the tyre valve with a couple layers of Teflon tape. Thread one of the hex nuts onto the stem of the tyre valve until you get to the half way point. Set aside.
Carefully push the first rubber washer(can made from bicycle tube) into the neck of the main pressure chamber. You will need to use a socket and wrench with one or two socket extensions to reach the bottom of the bottle. Balance a nut and the washer on the head of the socket and place the threaded tyre valve into the hole from the top down. With the skill of a surgeon, drive the nut and washer onto the rod. Tighten with a wrench on the outside surface. (At his point you could add a small dab of Sally glue to seal.
It will be necessary to shave down the second rubber washer to fit inside the bottle cap. The second bottle must be able to screw into the cap all the way down to the gasket. Sometimes the washer sticks out too much. Apply the washer and the nut and test fit the second bottle to make sure it seats well. If the second bottle sits crooked, then it is hitting the washer. Remove assembly and shave the washer again. Once you have the right fit, tighten the entire assembly.
The first advanced project is a double pressure chamber. This double rocket is a 3-liter pressure chamber. Two 1.5 liter bottles are joined by a small tyre valve rod. I found several versions of these plans online, but the best, and I suppose the original plans should be credited as "The Robinson Coupling". The hardest part of this project is sealing the joint where the couple is located. The air pressure inside the container needs to hold at 60 -100 psi. I still looking the best sealent/glue that can be used to avoid air from coming out from the the joint where the couple is located. So far I have found that Sally glue (can get from GIANT store) is flexible and strong enough to hold the seal. Be patient, the adhesive needs at least 24 hours to cure. Don't pressure test until then. But that glue still cannot hold the pressure up to 100 psi. I still looking the suitable glue to solve this problem.
The coupler can be made one of two ways. Either by joining bottom to bottom, or bottom to top. I will describe the joining bottom to top because it is easy to do it compare the joining bottom to bottom.
PARTS LIST:
(1) Tyre valve
(3) Nuts
(2) rubber Washers (can made from bicycle tube)
(1) 1.5 liter bottle cap
Teflon tape
Building the "Valve Coupler"
Start by carefully drilling a small hole in the bottom of the 2-liter pressure chamber and the bottle cap. The tyre valve should just barely fit into the holes. Be careful not to remove the blue plastic gasket at the bottom of the bottle cap. (It will help seal the joint in the end.) Dry fit all parts to make sure it will work before you go any further.
Wrap the tyre valve with a couple layers of Teflon tape. Thread one of the hex nuts onto the stem of the tyre valve until you get to the half way point. Set aside.
Carefully push the first rubber washer(can made from bicycle tube) into the neck of the main pressure chamber. You will need to use a socket and wrench with one or two socket extensions to reach the bottom of the bottle. Balance a nut and the washer on the head of the socket and place the threaded tyre valve into the hole from the top down. With the skill of a surgeon, drive the nut and washer onto the rod. Tighten with a wrench on the outside surface. (At his point you could add a small dab of Sally glue to seal.
It will be necessary to shave down the second rubber washer to fit inside the bottle cap. The second bottle must be able to screw into the cap all the way down to the gasket. Sometimes the washer sticks out too much. Apply the washer and the nut and test fit the second bottle to make sure it seats well. If the second bottle sits crooked, then it is hitting the washer. Remove assembly and shave the washer again. Once you have the right fit, tighten the entire assembly.
Selasa, 17 Ogos 2010
Penyambungan 2 botol untuk dijadikan badan roket air
Salam 1 malaysia,
Selamat menunaikan ibadat puasa bagi peminat2 roket air yang beragama islam.
Kali ini saya akan memperkenalkan satu kaedah untuk menyambungkan 2 botol minuman untuk dijadikan badan roket air. Kaedah ini dinamakan teknik peyambungan injap. Peralatan yang diperlukan adalah: 'valve' tayar motorsikal/basikal, paku lebih kecil sedikit drpd 'valve' tayar, pisau.
Langkah 1
Panaskan paku dan tebuk satu lubang pada bhg bawah botol dengan menggunakan paku panas tersebut. Tebukkan satu lagi lubang pada penutup botol minuman tersebut menggunakan kaedah yang sama seperti di atas.
Langkah 2
Kemaskan lubang yang di tebuk dengan menggunakan pisau supaya 'valve' tayar dapat masuk melaluinya. Pastikan lubang tersebut sama saiz dengan 'valve' supaya angin tidak dapat keluar melaluinya semasa angin dimasukkan ke dalam botol.
Langkah 3
Bagi mengelakkan
Masukkan 'valve' dari bahagian dalam botol(peringkat ini memerlukan kesabaran kerana agak sukar memasukkan valve dari bhg dalam botol, saya masih lg sedang memikirkan apakah alat yg sesuai digunakan utk memasukkan 'valve' dari bhg dalam botol sehingga keluar). Bagi mengelakkan sambungan yang dibuat daripada angin terkeluar semasa pelancaran, ambil tiub basikal dan letakkan pada bahagian atas sambungan dan bawah sambungan.
Selamat mencuba.......semoga berjaya.
Selamat menunaikan ibadat puasa bagi peminat2 roket air yang beragama islam.
Kali ini saya akan memperkenalkan satu kaedah untuk menyambungkan 2 botol minuman untuk dijadikan badan roket air. Kaedah ini dinamakan teknik peyambungan injap. Peralatan yang diperlukan adalah: 'valve' tayar motorsikal/basikal, paku lebih kecil sedikit drpd 'valve' tayar, pisau.
Langkah 1
Panaskan paku dan tebuk satu lubang pada bhg bawah botol dengan menggunakan paku panas tersebut. Tebukkan satu lagi lubang pada penutup botol minuman tersebut menggunakan kaedah yang sama seperti di atas.
Langkah 2
Kemaskan lubang yang di tebuk dengan menggunakan pisau supaya 'valve' tayar dapat masuk melaluinya. Pastikan lubang tersebut sama saiz dengan 'valve' supaya angin tidak dapat keluar melaluinya semasa angin dimasukkan ke dalam botol.
Langkah 3
Bagi mengelakkan
Masukkan 'valve' dari bahagian dalam botol(peringkat ini memerlukan kesabaran kerana agak sukar memasukkan valve dari bhg dalam botol, saya masih lg sedang memikirkan apakah alat yg sesuai digunakan utk memasukkan 'valve' dari bhg dalam botol sehingga keluar). Bagi mengelakkan sambungan yang dibuat daripada angin terkeluar semasa pelancaran, ambil tiub basikal dan letakkan pada bahagian atas sambungan dan bawah sambungan.
Selamat mencuba.......semoga berjaya.
Selasa, 3 Ogos 2010
Isnin, 2 Ogos 2010
Tempahan Pelancar Roket Air
Salam 1 Malaysia,
Untuk makluman semua saya masih lagi mempunyai 8 set pelancar yang sudah siap dihasilkan dan sedia untuk penghantaran bila-bila masa sahaja. Bagi mereka yang berminat sila hubungi saya untuk tempahan (013-7394353). Harga masih lagi RM150/unit termasuk kos penghantaran.
Siapa cepat dia dapat......tq
azmi j
Untuk makluman semua saya masih lagi mempunyai 8 set pelancar yang sudah siap dihasilkan dan sedia untuk penghantaran bila-bila masa sahaja. Bagi mereka yang berminat sila hubungi saya untuk tempahan (013-7394353). Harga masih lagi RM150/unit termasuk kos penghantaran.
Siapa cepat dia dapat......tq
azmi j
Bottle Rocket Designs...?
Q: In science class we are using 1.5 liter bottles for bottle rockets. We have to add on to the bottle (nose cone, fins, ect.) to make it stay in the air longer. Any suggestions? And what kind of material should each thing be built out of?
Also, how much water should the bottle be filled with?
Answer
This is fun. I just helped my son with his bottle rocket for science. Two critical areas of the rocket for success are the nose cone/parachute and the stability (getting the center of mass well forward of the center of aerodynamic drag. There is an easy test you can perform to check drag. Of course, fins are one method of moving the aerodynamic drag back and the nose cone moves the center of balance forward.
The biggest advance we found was using a compression plate for the nose cone. We used a cottage cheese container lid glued onto the base of the bottle to set the nose cone into. My son had concerns about the edge of the lip of the lid catching the air and pressurizing the nose cone as the rocket ascended, so we made exhaust holes to match up with the relief between the bumps on the bottom of the bottle. This makes use of the venturi effect to keep the nose cone firmly locked on until the rocket reaches its apex.
The nose cone has to be constructed so that it will tip off at less than a 45 degree tip angle. W placed 6 pennies (hot glued into the lid of the nose cone for additional mass forward and to help tip the nose cone off. His competition required that the nose cone, parachute and all parts of the rocket remain together is less than linear ft of length when deployed. So the nose cone also has a line tethering it to the rocket, as does the parachute. But we used an elastic shock cord to reduced damage to the rocket and parachute. This shock cord is tied through the compression plate.
For the parachute we used the thinnest clear trash bag we could find. Cut a 42" circle with a 2" circular vent in the center. This helps the efficiency o the parachute by keeping air flowing through the parachute but with lots of drag. If you don't have the vent, you can get a pillow of stale air stuck under the parachute and the whole thing comes down too quickly.
For stability, first you want to find the center of mass. Tape the nose cone with the parachute onto the rocket. Take a string and tie it around your rocket. Slide the string toward the nose or tail until the balance point is found and the rocket hangs horizontal to the ground. Mark this point with a permanent marker +M. Now to locate the aerodynamic center of drag. This is a bit more difficult. The rocket needs to be held horizontal over a pivot point. A short piece of wood trim with a 2-3 ft. dowel put in the middle of it forming an upside-down "T" works well. Hang the trim piece by a short string at the end of the dowel. Now you need a large fan. Using scotch tape, tape the rocket body horizontally attached to the trip piece with the location of your best guess of the aerodynamic center of drag located at the dowel point. now suspend the rocket in front of the airflow of the fan 5-8 ft from the fan. The rocket will likely tent to turn in the airflow. If the nose turns to the fan, then reposition the rocket a bit further forward on the pivot. If the tail turns toward the fan, reposition the rocket further back on the pivot. When the rocket is neutral in the air flow and has no tendency to turn toward or away, or just spins freely in the airflow then you have located the center of aerodynamic drag.
This point can be marked with a "+A" The +M should be at least 3-4" forward of the +A for good stability. Adding fins will
move the aerodynamic center of drag to the rear of the rocket. You can now do a quick check of the stability of your rocket. tie the same string you used for the center of mass test at the center of mass so the rocket hangs horizontal. Then put the rocket in front of the same fan you used previously. The rocket should point into the fan in a very stable fashion.
You will likely need to add fins. Be careful a this point. There should be constraints on where the fins can be. Check with your teacher. Thin plastic,as used in these cheap disposable cutting boards works well. Or if you can get thin balsa wood at a craft store you can cut any shape of fin that you want. Keep in mind that you want as much of the area of the fins as far back as possible. Unfortunately, the curve of the bottle near the neck makes mounting the fins challenging. That is why sloped or angled fins may work best. They will mount just forward of the curve of the bottle, but extend well to the rear of the curved part of the bottle all the way to the mouth of the bottle. Again, be careful of the constraints for clearances for the launch pad and pressure fitting. We had to keep out of the curved area of the bottle within the cylinder defined by the rest of the bottle, and the fins could not extend beyond the opening of the bottle.
Adhesive for the fins is critical. You cannot use hot glues or any solvent glues that molecularly bond with the plastic of the bottle. This could compromise the strength of the bottle and cause an explosion hazard on the launch pad when the bottle gets pressurized.
Good luck and have fun!
Also, how much water should the bottle be filled with?
Answer
This is fun. I just helped my son with his bottle rocket for science. Two critical areas of the rocket for success are the nose cone/parachute and the stability (getting the center of mass well forward of the center of aerodynamic drag. There is an easy test you can perform to check drag. Of course, fins are one method of moving the aerodynamic drag back and the nose cone moves the center of balance forward.
The biggest advance we found was using a compression plate for the nose cone. We used a cottage cheese container lid glued onto the base of the bottle to set the nose cone into. My son had concerns about the edge of the lip of the lid catching the air and pressurizing the nose cone as the rocket ascended, so we made exhaust holes to match up with the relief between the bumps on the bottom of the bottle. This makes use of the venturi effect to keep the nose cone firmly locked on until the rocket reaches its apex.
The nose cone has to be constructed so that it will tip off at less than a 45 degree tip angle. W placed 6 pennies (hot glued into the lid of the nose cone for additional mass forward and to help tip the nose cone off. His competition required that the nose cone, parachute and all parts of the rocket remain together is less than linear ft of length when deployed. So the nose cone also has a line tethering it to the rocket, as does the parachute. But we used an elastic shock cord to reduced damage to the rocket and parachute. This shock cord is tied through the compression plate.
For the parachute we used the thinnest clear trash bag we could find. Cut a 42" circle with a 2" circular vent in the center. This helps the efficiency o the parachute by keeping air flowing through the parachute but with lots of drag. If you don't have the vent, you can get a pillow of stale air stuck under the parachute and the whole thing comes down too quickly.
For stability, first you want to find the center of mass. Tape the nose cone with the parachute onto the rocket. Take a string and tie it around your rocket. Slide the string toward the nose or tail until the balance point is found and the rocket hangs horizontal to the ground. Mark this point with a permanent marker +M. Now to locate the aerodynamic center of drag. This is a bit more difficult. The rocket needs to be held horizontal over a pivot point. A short piece of wood trim with a 2-3 ft. dowel put in the middle of it forming an upside-down "T" works well. Hang the trim piece by a short string at the end of the dowel. Now you need a large fan. Using scotch tape, tape the rocket body horizontally attached to the trip piece with the location of your best guess of the aerodynamic center of drag located at the dowel point. now suspend the rocket in front of the airflow of the fan 5-8 ft from the fan. The rocket will likely tent to turn in the airflow. If the nose turns to the fan, then reposition the rocket a bit further forward on the pivot. If the tail turns toward the fan, reposition the rocket further back on the pivot. When the rocket is neutral in the air flow and has no tendency to turn toward or away, or just spins freely in the airflow then you have located the center of aerodynamic drag.
This point can be marked with a "+A" The +M should be at least 3-4" forward of the +A for good stability. Adding fins will
move the aerodynamic center of drag to the rear of the rocket. You can now do a quick check of the stability of your rocket. tie the same string you used for the center of mass test at the center of mass so the rocket hangs horizontal. Then put the rocket in front of the same fan you used previously. The rocket should point into the fan in a very stable fashion.
You will likely need to add fins. Be careful a this point. There should be constraints on where the fins can be. Check with your teacher. Thin plastic,as used in these cheap disposable cutting boards works well. Or if you can get thin balsa wood at a craft store you can cut any shape of fin that you want. Keep in mind that you want as much of the area of the fins as far back as possible. Unfortunately, the curve of the bottle near the neck makes mounting the fins challenging. That is why sloped or angled fins may work best. They will mount just forward of the curve of the bottle, but extend well to the rear of the curved part of the bottle all the way to the mouth of the bottle. Again, be careful of the constraints for clearances for the launch pad and pressure fitting. We had to keep out of the curved area of the bottle within the cylinder defined by the rest of the bottle, and the fins could not extend beyond the opening of the bottle.
Adhesive for the fins is critical. You cannot use hot glues or any solvent glues that molecularly bond with the plastic of the bottle. This could compromise the strength of the bottle and cause an explosion hazard on the launch pad when the bottle gets pressurized.
Good luck and have fun!
Ahad, 1 Ogos 2010
FLIGHT OF A WATER ROCKET
On this page we show the events in the flight of a water rocket. Water rockets are among the simplest type of rocket that a student encounters. The body of the rocket is an empty, plastic, two-liter soda bottle. Cardboard or plastic file fins are attached to the bottom of the bottle for stability, and a fairing and nose cone are added to the top as a payload.
Prior to launch, the body of the rocket is filled with water to some desired amount, normally about 1/3 of the volume. The rocket is then mounted on a launch tube which is quite similar to that used by a compressed air rocket. Air is pumped into the bottle rocket to pressurize the bottle and thrust is generated when the water is expelled from the rocket through the nozzle at the bottom. Like a full scale rocket, the weight of the bottle rocket is constantly changing during the powered ascent, because the water is leaving the rocket. As the water leaves the rocket, the volume occupied by the pressurized air increases. The increasing air volume decreases the pressure of the air, which decreases the mass flow rate of water through the nozzle, and decreases the amount of thrust being produced. Weight and thrust are constantly changing during the powered portion of the flight. When all of the water has been expelled, there may be a difference in pressure between the air inside the bottle and the external, free stream pressure. The difference in pressure produces an additional small amount of thrust as the pressure inside the bottle decreases to ambient pressure. When the pressures equalize, there is no longer any thrust produced by the rocket, and the rocket begins a coasting ascent.
The remainder of the flight is quite similar to the flight of a ballistic shell, or a bullet fired from a gun, except that aerodynamic drag alters the flight trajectory. The vehicle slows down under the action of the weight and drag and eventually reaches some maximum altitude which you can determine using some simple length and angle measurements and trigonometry. The rocket then begins to fall back to earth under the power of gravity. Bottle rockets may include a recovery system like a parachute, or a simple detachment of the payload section, as shown in the figure. After recovering the rocket, you can fly again.
On the graphic, we show the flight path as a large arc through the sky. Ideally, the flight path would be straight up and down; this provides the largest maximum altitude. But water rockets often turn into the wind during flight because of an effect called weather cocking. The effect is the result of aerodynamic forces on the rocket and cause the maximum altitude to be slightly less than the optimum. The parabolic arc trajectory also occurs if the launch platform is tilted and the rocket is launched at an angle from the vertical.
Sumber : NASA water rocket article.
Jumaat, 30 Julai 2010
Pertandingan Teknologi Pelancaran Roket Prgkt Negeri Johor 2010
Pautan di bawah merupakan gambar2 semasa pertandingan teknologi pelancaran roket peringkat negeri johor yang telah berlangsung di daerah Mersing pada 21-22/Julai 2010
Roket payung terjun klik di sini untuk gambar2 lain
Roket payung terjun klik di sini untuk gambar2 lain
Roket Sasaran klik di sini untuk gambar2 lain
Khamis, 29 Julai 2010
Gambar2 semasa pertandingan Teknologi Pelancaran Roket Peringkat Negeri Johor 2010 di Mersing
Harap bersabar. saya ada sedikit masalah utk 'upload' gambar2 semasa pertandingan berlangsung.
gambar2 tersebut akan di upload kan dalam masa terdekat. sila kunjungi semula laman blog ini sedikit masa lagi.
tq
gambar2 tersebut akan di upload kan dalam masa terdekat. sila kunjungi semula laman blog ini sedikit masa lagi.
tq
Rabu, 28 Julai 2010
Keputusan Pertandingan Teknologi Pelancaran Roket Prgt Negeri Johor 2010
Tahniah, kepada Daerah Kulai, Daerah Segamat dan Daerah Mersing kerana berjaya mendapat tempat 1,2 dan 3 pertandingan FST peringkat negeri Johor 2010 yang berlangsung di daerah Mersing - SMK Anjung Batu pada 21- 22 Julai yang lalu.
Gambar-gambar semasa pertandingan sedang dimuatnaik. Sila kunjungi laman blog ini beberapa hari lagi. Terima kasih
Gambar-gambar semasa pertandingan sedang dimuatnaik. Sila kunjungi laman blog ini beberapa hari lagi. Terima kasih
Khamis, 15 Julai 2010
''Baby Rocket''
Petang semalam pelajar2 saya telah mencuba 'baby rocket -projek terbaru dari mereka. Roket yang dibuat daripada botol minuman 500ml. Mereka telah menghasilkan satu 'baby rocket' paracut yang menarik.
Semasa cubaan pelancaran dibuat didapati 'baby roket' yang dihasilkan tidak dapat menandingi ketinggian roket yang dihasilkan daripada botol 1.5L. Walaubagaimana pun mereka masih lagi mencuba/ber 'eksperimen' dengan mengubah isipadu air, tekanan yang dikenakan, berat muncung dan saiz paracut yang digunakan.'
Semoga berjaya menghasilkan 'baby rocket' yang mantap............
gambar akan dimuatnaikkan kemudian....apabila mereka berjaya menghasilkan 'baby rocket' yang betul2 mantap....
Semasa cubaan pelancaran dibuat didapati 'baby roket' yang dihasilkan tidak dapat menandingi ketinggian roket yang dihasilkan daripada botol 1.5L. Walaubagaimana pun mereka masih lagi mencuba/ber 'eksperimen' dengan mengubah isipadu air, tekanan yang dikenakan, berat muncung dan saiz paracut yang digunakan.'
Semoga berjaya menghasilkan 'baby rocket' yang mantap............
gambar akan dimuatnaikkan kemudian....apabila mereka berjaya menghasilkan 'baby rocket' yang betul2 mantap....
Selasa, 13 Julai 2010
Roket air V7 (reka bentuk terkini) SMK Maokil
Prestasi roket V7 ini sangat membanggakan kerana drpd 10 kali pelancaran 7 kali memasuki bulatan 'eye's bull' (bltn 1 - bltn5). Berat keseluruhan roket dan kekukuhan sayap perlu diberi perhatian oleh pelajar yang berminat untuk menghasilkannya.
Roket V7 ini akan berputar2 dalam garisan yang lurus menuju ke tempat pendaratan semasa penerbangannya
Selamat mencuba....
Jumaat, 9 Julai 2010
Gambar2 semasa pertandingan Teknologi Pelancaran Roket Daerah segamat 2010
Maaf sila kembali ke laman ini semula....dalam proses muatnaik......
Khamis, 8 Julai 2010
Keputusan Pertandingan Teknologi Pelancaran Roket Daerah Segamat 2010
Alhamdulillah, pertandingan teknologi pelancaran roket telah berjaya dijalankan dengan jayanya pada 7 hingga 8 Julai 2010. Walaupun pada mula nya pelbagai masalah dihadapi berkaitan dengan pelancar roket air tripod yang digunakan. Namun semua masalah tersebut dapat di atasi berkat kegigihan penganjur/pengelola.
Pada tahun ini, saya rasakan kemeriahan pertandingan teknologi pelancaran roket adalah kurang sedikit berbanding dengan tahuin 2009. Mungkin disebabkan pelajar2 yang menunggu giliran berada terlalu jauh daripada tapak pelancaran.
Kepada peserta SMK Maokil, Wan Mohd Nizam dan Mohd Hanapeze tahniah cg ucapkan kerana berusaha dengan gigih sekali untuk mendapat tempat ke pertandingan peringkat negeri. Walaubagaimanapun nasib tidak menyebelahi kita semua pada tahun ini kerana roket paracut yang dihasilkan gagal untuk mengembangkan payungnya manakala bagi kategori sasaran smk maokil masih lagi berbisa walaupun sudah semakin kurang kerana berjaya mendapat tempat ke dua. Sekali lagi tahniah cg ucapkan kepada Wan dan Peze tahun hadapan berusaha dengan lebih gigih lagi.....
Keseluruhannya bagi acara roket paracut, teknologi yang ditunjukkan oleh pelajar2 semakin baik pada tahun ini. Kebanyakkan pelajar dapat menghasilkan roket berprestasi tinggi. Bagi acara sasaran hanya 5 buah sekolah sahaja yang berjaya mendaratkan roket dalam bulatan target dan mendapat markah.
Berikut merupakan keputusan pertandingan :
Kategori Sasaran (jarak sasaran 100m)
1. SMK Labis (Bulatan ke 2)
2. SMK Maokil (Bulatan ke 3 hampir kpd bulatan 2)
3. Sek Tinggi Segamat (Bulatan 3 hampir kpd bulatan 4 )
4. SMK Dato Ahmad Arshad (Bulatan 4)
5. SMK Paduka Tuan (Bulatan 5)
Kategori Paracut
1. SMK Dato Ahmad Arshad (1 minit 30.61 saat)
2. SMK Munshi Ibrahim (1 minit 12.84 saat)
3. Sek Tinggi Segamat (53.66 saat)
4. SMK Seri Kenangan (52.17 saat)
5. SMK Jementah (51.97 saat)
Johan Keseluruhan Teknologi Pelancaran Roket Daerah Segamat 2010 dan wakil daerah Segamat ke Pertandingan Negeri
SMK Dato Ahmad Arshad
Terima kasih diucapkan kepada para hakim yang menjayakan pertandingan tersebut iaitu
1. En Rajis- Ketua Hakim (SMK Bnadar Putra)
2. En Md Azam
3. En Saifuddin
semoga kita semua akan bertemu lagi pada pertandingan akan datang.....yang terdekat terbuka pagoh....nantikan tarikh nya.....
Pada tahun ini, saya rasakan kemeriahan pertandingan teknologi pelancaran roket adalah kurang sedikit berbanding dengan tahuin 2009. Mungkin disebabkan pelajar2 yang menunggu giliran berada terlalu jauh daripada tapak pelancaran.
Kepada peserta SMK Maokil, Wan Mohd Nizam dan Mohd Hanapeze tahniah cg ucapkan kerana berusaha dengan gigih sekali untuk mendapat tempat ke pertandingan peringkat negeri. Walaubagaimanapun nasib tidak menyebelahi kita semua pada tahun ini kerana roket paracut yang dihasilkan gagal untuk mengembangkan payungnya manakala bagi kategori sasaran smk maokil masih lagi berbisa walaupun sudah semakin kurang kerana berjaya mendapat tempat ke dua. Sekali lagi tahniah cg ucapkan kepada Wan dan Peze tahun hadapan berusaha dengan lebih gigih lagi.....
Keseluruhannya bagi acara roket paracut, teknologi yang ditunjukkan oleh pelajar2 semakin baik pada tahun ini. Kebanyakkan pelajar dapat menghasilkan roket berprestasi tinggi. Bagi acara sasaran hanya 5 buah sekolah sahaja yang berjaya mendaratkan roket dalam bulatan target dan mendapat markah.
Berikut merupakan keputusan pertandingan :
Kategori Sasaran (jarak sasaran 100m)
1. SMK Labis (Bulatan ke 2)
2. SMK Maokil (Bulatan ke 3 hampir kpd bulatan 2)
3. Sek Tinggi Segamat (Bulatan 3 hampir kpd bulatan 4 )
4. SMK Dato Ahmad Arshad (Bulatan 4)
5. SMK Paduka Tuan (Bulatan 5)
Kategori Paracut
1. SMK Dato Ahmad Arshad (1 minit 30.61 saat)
2. SMK Munshi Ibrahim (1 minit 12.84 saat)
3. Sek Tinggi Segamat (53.66 saat)
4. SMK Seri Kenangan (52.17 saat)
5. SMK Jementah (51.97 saat)
Johan Keseluruhan Teknologi Pelancaran Roket Daerah Segamat 2010 dan wakil daerah Segamat ke Pertandingan Negeri
SMK Dato Ahmad Arshad
Terima kasih diucapkan kepada para hakim yang menjayakan pertandingan tersebut iaitu
1. En Rajis- Ketua Hakim (SMK Bnadar Putra)
2. En Md Azam
3. En Saifuddin
semoga kita semua akan bertemu lagi pada pertandingan akan datang.....yang terdekat terbuka pagoh....nantikan tarikh nya.....
Rabu, 7 Julai 2010
Selamat berjuang...
Kepada peserta SMK maokil, saya ucapakan selamat berjuang sampai ke titisan darah yanag terakhir......daerah mersing melambai2 anda utk FST peringkat negeri Johor tahun 2010.
Kepada semua yang akan menyertai FST daerah segamat pada 7 dan * Julai 2010 saya ucapkan...selamat semuanya....
terutama untuk acara teknologi pelancaran roket sasaran dan paracut. Untuk makluman semua pembahagian markah bagi kategori roket sasaran adalah 60% manakala roket paracut adalah 40%.. Harap maklum...
Kepada peminat2 roket air, saya akan muatnaikkan gambar2 menarik semasa FST daerah berlangsung. Sila kembali ke laman blog ini selepas 8 Julai 2010 untuk melihat gambar2 yang menarik.
terima kasih
Kepada semua yang akan menyertai FST daerah segamat pada 7 dan * Julai 2010 saya ucapkan...selamat semuanya....
terutama untuk acara teknologi pelancaran roket sasaran dan paracut. Untuk makluman semua pembahagian markah bagi kategori roket sasaran adalah 60% manakala roket paracut adalah 40%.. Harap maklum...
Kepada peminat2 roket air, saya akan muatnaikkan gambar2 menarik semasa FST daerah berlangsung. Sila kembali ke laman blog ini selepas 8 Julai 2010 untuk melihat gambar2 yang menarik.
terima kasih
Khamis, 1 Julai 2010
MAKLUMAN : HARGA PROMOSI PELANCAR BULAN JUN TAMAT
PERHATIAN
HARGA BARU PELANCAR SEKARANG BERMULA BULAN APRIL 2012 ADALAH RM250 TERMASUK KOS PENGHANTARAN MENGGUNAKAN POS LAJU/CITYLINK. SILA BUAT TEMPAHAN SEKARANG BAGI YANG BERMINAT....UNTUK HARGA TERKINI SILA KE LAMAN UTAMA
UTK TEMPAHAN SILA SMS/EMAIL SAYA:
0137394353
azmi.jaaffar@yahoo.com.my
Harap maklum: Kepada semua pembaca harga promosi utk bulan jun 2010 telah tamat. Harga pelancar dan harga powerpoint slide show telah dinaikkan semua kepada harga asal iaitu RM150 (untuk pelancar) termasuk kos penghantaran (tambahan RM20 untuk penghantaran bagi sabah dan Serawak - berat pelancar adalah 3.5 kg) dan powerpoint slide show -RM30. Harap maklum
Bagi yaang telah menempah semasa bulan jun harga masih dikekalkan sehingga penghantaran dibuat. Terima kasih.
Tempahan baru bagi pelancar roket air akan hanya dibuat selepas seminggu (8/7/2010) kerana saya sedang sibuk mengurusan persiapan/latihan pelajar ke pertandingan FST daerah segamat. Harap maklum.
HARGA BARU PELANCAR SEKARANG BERMULA BULAN APRIL 2012 ADALAH RM250 TERMASUK KOS PENGHANTARAN MENGGUNAKAN POS LAJU/CITYLINK. SILA BUAT TEMPAHAN SEKARANG BAGI YANG BERMINAT....UNTUK HARGA TERKINI SILA KE LAMAN UTAMA
UTK TEMPAHAN SILA SMS/EMAIL SAYA:
0137394353
azmi.jaaffar@yahoo.com.my
Harap maklum: Kepada semua pembaca harga promosi utk bulan jun 2010 telah tamat. Harga pelancar dan harga powerpoint slide show telah dinaikkan semua kepada harga asal iaitu RM150 (untuk pelancar) termasuk kos penghantaran (tambahan RM20 untuk penghantaran bagi sabah dan Serawak - berat pelancar adalah 3.5 kg) dan powerpoint slide show -RM30. Harap maklum
Bagi yaang telah menempah semasa bulan jun harga masih dikekalkan sehingga penghantaran dibuat. Terima kasih.
Tempahan baru bagi pelancar roket air akan hanya dibuat selepas seminggu (8/7/2010) kerana saya sedang sibuk mengurusan persiapan/latihan pelajar ke pertandingan FST daerah segamat. Harap maklum.
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