When are the constant speed propeller blades against the low pitch stops during flight? Explain?

Answer 1

Only at max RPM when the aircraft is stationary.

Any forward airspeed will decrease the thrust and drag on the propeller (by decreasing the angle of attack on the prop blade) and overspeed the engine.

We recovered a Cessna 185 that crashed near here that I think had the prop stuck on the low pitch stops. The guy was at max RPM and couldn't climb above 3000 feet (local terrain was about 1500 feet with mountains surrounding). A Cessna 185 is normally a rocketship at 3000 feet with max rpm and power but this guy had to hold the Manifold pressure back to keep from overrevving the engine. Normally a constant speed prop will fail to a coarse pitch to allow more power to be absorbed without overspeeding the engine.

Answer 2

The low pitch stop is a safety device to prevent a variable-pitch prop from going into a negative (reverse) pitch during flight. When the aircraft is on the ground, the device is disconnected allowing reverse pitch. The pitch change mechanism shouldn't contact the low pitch stop unless a malfunction has occured. Or if someone is dumb enough to try to reverse the prop in flight.

Answer 3

Durning take off for one

Answer 4

You stole my avatar!

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