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Old 10-14-2019, 12:33 PM
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gmcjetpilot gmcjetpilot is offline
Join Date: Jan 2005
Posts: 4,278

Originally Posted by N941WR View Post
Lycoming used to have a manually controlled prop, see my post above.

While I never flew with it, I am familiar with it.

The problem, as I understand it, is that the pilot needs to he careful not to over speed the engine. In flight, you essentially have a fixed pitch prop but depending on where it is set, it could be a climb or cruise prop, or anything in between. The blade angle did not change with RPM and/or manifold pressure.
I just can't picture the mechanism. I know it has been done. The old Navions had a diaphragm behind the prop and it expanded and contracted moving mechanism to move the blades. It was variable pitch not constant speed. I can't picture the design....
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