ORIGINAL: ***Reno***
Can you clarify how the pushrod length/trim will change? As I look at the pushrod, one end screws while the other end unscrews. Maybe I can lock the whole thing up with a nut at the ball joint on each end?
A nut would work, so would some kind of glue or goop on the threads. Nylon ball-links don't turn as freely as metal clevises, but in theory one of them could unscrew itself. (You're right; the trim wouldn't change until the moment the connection actually broke.)
Some might scoff at the notion that a pushrod could rotate by itself. The other day I was bench-running a Q500 with the wing off, to diagnose a fuel draw problem. This airplane had a cylindrical fuel tank in it. As soon as the engine got up to peak rpm, I could see the tank begin merrily rotating in there, twisting the fuel lines into a knot. Mystery solved! [X(]
Duane Gall
RCPRO