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So you are saying that the base of the propeller feather is hydraulic mechanism?
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The propeller itself is electric but the system uses a hydraulic switch to read engine oil pressure and meter electric current to the propeller.
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The lubricating oil used as "hydraulic fluid"?
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No hydraulic propeller system AFAIK uses hydraulic fluid, they all use engine oil. That is also why you cycle a CSP several times during your ground run up, to ensure it is filled with engine oil.
