Paul,
I'm very new and green to your world of propellers and reduction drives.
Take a look at my edited version of one of your boxes on your sight to
possibly run a hydraulic constant speed propeller.
Sorry for the poor diagram but on holiday with my lap top.
Let me know if i'm on the right track, and what pressures we need to
work on to get the pitch of these props to change.
Craig South Africa.

Whats happening, are you shell shocked at how easy this could be.
Craig South Africa


Intersting idea but the screw pump will give a linear change in pressure
(assuming it works) with RPM from zero on up but that is not what
you need. A fly ball gov is a bang bang servo centered arround some
RPM in the range of 2000 to 2500 RPM. Put "bang bang servo" in google.
A flyball gov is not really a proportional servo. You might get
"hunting". It might be worth a try anyway.

Paul Lamar

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