Asymmetric effect - propeller, Other Engineering

Asymmetric Effect

In general the axis of the propeller will be inclined upwards to the direction of flight due to the angle of attack of the aircraft.

1018_Asymmetric Effect.png 
This causes the down moving blade to have a greater effective angle of attack than the up going blade and therefore to develop a greater thrust.

The difference in thrust on the two sides of the propeller disc causes a yawing moment. For a right hand propeller in a nose-up attitude the yaw will be to the left.

163_Asymmetric Effect1.png

A similar effect can occur if the aeroplane is flying yawed, the asymmetry of the thrust causing a pitching moment is this case. The ratio of total blade area to the disc area, the greater the solidity the more power can be absorbed by the propeller.

 

Posted Date: 9/14/2012 2:31:43 AM | Location : United States







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