# Is flow attached at fixed propeller blade at every RPM / speed conditions?

Propeller blade AoA depends on tangential veloctiy caused by rotation and forward speed "head wind". If propeller has fixed pitch is flow attached on blade at every RPM / speed conditions?

For example when plane has full throttle when staying on ground at same place,forward veloctiy is very small,that mean AoA is higher,does this cause flow separation at low pressure side of blade at this RPM/speed condition..etc

• @PeterKämpf The separated area is large at low speed and gradually diminishes as speed is increased At every fixed blade propeller this happend?Does flow separation at blade require more engine power at same propeller RPM compare to attached flow? – user52248 Sep 13 '20 at 18:34