The 24mm engine mount tube is rolled around a D engine, not too tight, not too loose.
The pre-bent engine hook is set into two holes you punch in the engine tube. Slice the centering rings over the engine hook.
The engine hook is interesting, you can see how it locks over the engine casing.
The hook is held down with glued thread.
Put a small drop of glue on the tube and set the thread end into it. Let it dry before you try to do any more wraps.
Do three or four wraps then rub a drop of glue into the threads. Let that dry before continuing. Follow with more wraps and glue.
Here's all the thread wraps in place.
Two drops of glue are set over the ends of the bent wire where they enter the tube holes.
I have to say I kind of like that engine hook design. Trying to think if it has any obvious disadvantages, since I don't recall anyone else ever using it...
ReplyDeleteHi Neil, The engine hook was the highlight of the kit. The ends that go into the tube at the top are bent at a 90 degree angle, almost like an engine bock. The trick would be finding the right wire and maybe making a jig to bend a few consistently.
DeleteI like it! Very clever. I might add a thrust ring at the front of the retainer, to relieve the stress on the engine tube. And I don't have the patience to wrap and glue thread, so I would probably sub a mylar ring or piece of BT-20+ tubing.
ReplyDeleteFYI, here's another homemade engine clip link:
http://qualmanrocketry.com/qualman_clips.html
I'm going to experiment with both and see how they work. Laters.
BTW is that copper wire? Wouldn't that be too soft, as compared to spring steel?
DeleteHi BAR,
DeleteI have seen the Qualman engine hook before. His fin alignment guides look interesting.
Hi BAR,
DeleteI don't know what the wire was, stiffer than a copper would be.