Thank you Paul! 

For the rest...refer to your propeller owner's manual... Not Glenda the Good Witch of the Wind.

Jeff ;)

Sent from my iPad

On Aug 21, 2013, at 6:40 AM, Paul Miller <pjdmiller@gmail.com> wrote:

Maybe we should refer to the manuals on how props go to low pitch.  It ain't relative wind or any other kind of wind.  It is a "really big spring" in the hub.  From Hartzell:

(2) Centrifugal twisting moment acting on the blades moves the blades to a low blade angle (low pitch) to increase RPM. Since the centrifugal twisting moment is only present when the propeller is rotating, a mechanical spring is installed within the propeller to assist movement of the blades to a lower pitch position as RPM decays, and to reduce the propeller pitch to the low pitch stop when the propeller is static. With the blades at low pitch, the load on the starter when starting the engine is reduced significantly. 

(3) Oil pressure opposes the spring and centrifugal twisting moment to move the blades to a high blade angle (high pitch), reducing engine RPM. 

(4) If oil pressure is lost at any time, the propeller will move to low pitch. This occurs because the spring and blade centrifugal twisting moment are no longer opposed by hydraulic oil pressure. The propeller will then reduce blade pitch to the low pitch stop.

On 2013-08-20, at 1:45 PM, Jack Morgan <jmorgan1023@comcast.net> wrote:

If oil pressure fails, standard CS props are driven flat by the relative wind ...