I didn't see the flap photos I sent, so here it is. This is all tentative, things can change, but this is pretty close to what the final configuration will be. The flap is opened with a gas spring
and closed with a bicycle brake cable. There is a pulley on the flap end of the gas spring, so is has a 2/1 mechanical advantage, and the windlass(I guess that's what you'd call it) has a 2/1
mechanical advantage.  I don't intend to use the cowl flap as a speed brake.

Brian Trubee

 
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