Item 1058

DESIGN: UniCopter ~ Trim, Stability & Control - Trim - Propeller

Symbol Definitions - Flight Dynamics

Drawing:

xxx

Note:

April 25, 2004 ~

ΛHOS or αHOS may be used for the crankshaft's (propeller) angle off of the horizontal.

The final angle of ΛLON and ΛHOS will probably be dependent on the load sharing between the rotors and the propeller at cruse

The craft must have speed stability during powered forward flight and autorotation. There must not be any abrupt pitch change upon loss of power. The loss of rotor torque about the pitch axis will want to cause the nose to drop. This will be true in forward flight and hover.

Perhaps the propeller's thrust should try to cause a slight nose down attitude. This will counter the rotors' moment during forward flight, but not during hover.

In addition, even if the propeller is free wheeling, what will the drag of the propeller and duct do to the pitch during autorotation? 

Back to top | UniCopter Home Page

Last Revised: April 25, 2004