BTW do you guys make your own variable pitch props?

Yes, with about a 100 to one ratio planetary drive and a ball screw.  It
back drives under vibration.

Jeff Spitzer

Ball screws are nice but expensive. We have more friction and reduction 
so I hope this does not happen to us. I would hate to have to readjust 
the prop if the RPM creeps up.

Paul Lamar
 
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