RCU Forums - View Single Post - Can anyone explain THRUST ANGLES to me?
Old 11-30-2005 | 03:33 PM
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MajorTomski
 
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Default RE: Can anyone explain THRUST ANGLES to me?

AAARRRRRGGGGHHHHH!!!!!

PEOPLE! PLEASE STOP!

Right thrust cannot, will not, and does not in any way shape or form have the ability to cancel out TORQUE. PERIOD. To do so would be a major violation of the laws of physics. If it did, helicopters wouldn't need tail rotors, we'd just bend the main shaft off in a specific direction.

Right thrust ONLY compensates for P factor. Which is differential thrust across the face of a propeller primarily due to different rotational velocities (the downward moving prop combined with the forward airspeed has a higher airspeed than the upward moving prop)(yes, do the math, that is the main source of the forces involved) this is increased slightly by differing angles of attack on opposite sides of the prop face. This, as stated above causes more thrust down one side of the fuselage. Right thrust moves this differential thrust more closer to the CG thus reducing its effect.

Slipstream swirl around the fuselage is a myth started in !QUOT!Stick and Rudder!QUOT! There are no formulas to resolve this !QUOT!correlation!QUOT! between thrust and offset.

Ironically adding only downthrust reduces the need for right thrust, at least for a sport plane in a climb.


PLEASE stop this torque/ offset thrust myth!