If engine power is increased with the propeller lever in the constant speed range, what happens?

When engine power is increased while the propeller lever is in the constant speed range, the engine’s governor responds to maintain the set RPM. The governor works by regulating the blade angle of the propeller to control the engine speed.

In this scenario, as power increases, the governor weights move out due to the increase in centrifugal force caused by the higher RPM. This movement indicates that the system is attempting to maintain the desired engine velocity. With the governor weights moving out, the blade angle of the propeller is adjusted, generally leading to an increase in the blade angle. This increased angle helps adjust the thrust produced by the propeller in accordance with the increased engine power.

However, the RPM must be regulated to maintain a constant speed, which provides a balance to prevent an increase in engine RPM that could exceed safe operational limits. By increasing the blade angle and working against the increased engine power, the propeller can effectively control the speed and maintain a stable operation. Ultimately, this interaction of the governor’s actions encompasses an intricate system of responses to maintain consistent engine performance.

The remaining options do not accurately depict the mechanics of how the governor and propeller blade angle function together to stabilize RPM in response to changes in engine power.