special thanks to the author for this good article
This was a mock-up, that became a prototype, and then was put into use as test one. It needs to be rebuilt and refined, made lighter in weight, and adapted to other size rockets. I am repairing this model tonight for more flights Sunday. I am going to put it on a 6 liter rocket to see if it works up high as well as it did at 250 ft. or so. The Fritos can is just a holder.
In pictures 3 and 4 to the left, you can see the lips or flanges that allow the nose cone to be secure on the rocket at launch without danger of being jammed at apogee. The lower lip is the rim of a margarine tub, I got the idea for that from one of the Web Ring pages, the upper flange that mates with the lower one ifs cut from a 32 oz. "big gulp" type plastic cup the local convienence store had. Thanks to Bob "Rocket" Brown for noticing that it fit my guppy nosecone so nicely.
The trigger is a piece of cable tie ground smooth on both sides.