BTW if the  system fails the pitch stays were it was.

Paul Lamar

You may want to check this Paul.  Even a properly tightened screw can turn
when subjected to engine vibration.  Just 'cause your pitch motor won't
backdrive on the bench doesn't mean it won't on the running engine.  That's
what we found.

Jeff Spitzer

Thanks for the tip Jeff. Who would guess a 144:1 planetary multistage
gear set would back drive through a 28 turns to the inch screw.

BTW do you guys make your own variable pitch props?

Maybe I can come up with some sort of visible, from the cockpit,
pitch indicator if I think about it for awhile. I will give it
some thought on the way down to Florida.
 
Paul Lamar
 
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