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Old 08-30-2009 | 07:04 AM
  #3  
flyboyfreye
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Joined: Dec 2007
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From: Right Seat, Cessna 402/421
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thanks for the reply...but that's just the thing. I have the POH right here and I've quoted it exactly. Now I did find the following yesterday which seemed to suggest that there are different kinds of controllable pitch props.

OVERSPEED
"Counterweighted Propeller using Pressure to Decrease Pitch (see Fig. 2)
The flyweight toes raise the pilot valve plunger, uncovering ports in the driver gear shaft that permit pressure oil to flow from the propeller pitch changing mechanism. This allows propeller counterweights to take the propeller blades towards a higher pitch. The load on the engine is increased and engine speed is reduced."


UNDERSPEED
Counterweighted Propeller using Pressure to Decrease Pitch (see Fig. 2)
The pilot valve plunger is forced down uncovering the ports in the drive gear shaft that allow pressure oil to flow to the pitch changing mechanism of the propeller. This overcomes the force of the propeller counterweights and decreases the pitch of the propeller blade.


This scenario would seem to match the system as described in the cirrus, but no where do I see anything about it being a "counterweighted prop".
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