Friday, February 20, 2009

Mozzie Building

I actually found some time to assemble half of it today. In roughly chronological order:
  • Tested the 18" ripstop nylon parachute. It's amazing: folds into a tiny ball, has nice thick, long shroud lines that don't tangle, unfolds perfectly in cold weather, and is a nice deep purple that will stand out against blue sky, clouds, grass, etc. Far better than Estes chutes, and not ridiculously priced if you buy it alone: $12.50 for an 18" chute and a 9" flameproof parachute protector that functionally replaces wadding.

  • Glued a heavy screw inside the hollow in the nose cone for balance; then glued the thick eye bolt and its plywood holder disk on. Solidly on. I am using wood glue throughout rather than suggested epoxy, but I have no doubt that it'll hold together.

  • Assembled the motor mount. Glued the two plywood centering rings on, then cut excess off the forward end of the mount per the instructions to make room for the recovery system. Even so, room is tight. I wish the nose cone shoulder was just a hair shorter.

  • Made a 29mm to 24mm adapter from 3" of 24mm tubing, three 24mm-29mm centering rings, and half an inch of the extra motor mount tubing. I'll get a picture up sometime. The adapter and the motor are both held in place for flight by a quick wrap of masking tape. The adapter will be perfect for motors like D12-3s and a 24/40 reload casing with reloads like D15-4s and E11-3s.

  • Attached the Kevlar shock cord to the longer nylon cord and the motor mount. It's held solidly in place, far better than an Estes-style mount. Together, there's over 6' of shock cord. I like the look of a rocket dangling far under its chute on a long shock cord; it makes the rocket look bigger. (Estes-size rockets will use about twice the body length of rubber band shock cord, while a typical L3 rocket might use 150' - ten times the body length.)

  • Glued in the motor mount, and put a fillet on the back end. I'll glue in the fins and launch lugs and attach the nose cone tomorrow; I might even fly it Sunday. Then again, it's Saturday about 5 minutes.

*Goes to bed*

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