Item 1365
DESIGN:
UniCopter ~ Control - Flight - Independent Root & Tip - Blade Tip
Drawing:
xxx
Rotor Tip Control:
Input to Tip Mixer:
Tip Mixer to Tip Swashplate:
There are the three conventional inputs to the swashplate. It is hoped that power assistance will not be required for the control of the tips.
Tip Swashplate to Blades:
Airspeed:
On initial consideration, it appears that as the airspeed increases the forward tip of the disk should be reduced
Additional Notes:
The blade tip is set by the tip swashplate, or possibly by an inverted spider. This is controlled by the pilot's use of cyclic, partial collective and pedals. The use of Absolutely Rigid Rotors will provide fast response and therefor only blade-tip change should be needed for directional control.
Cyclic Stick Forces:
Each of the rotors will have lateral pitch dissymitry during all or most flight realms, but since they are rotating in opposite directions they may cancel each other. Where the effect of this disymetry will probable show up is when cyclic is applied. The force will probably want to center the cyclic lever. This is because the increased torsional moment in one rotor will be greater than the decreased torsional moment in the other for the same amount of rotational movement. This may not be necessarily so if the throttle or collective applies a spring force, which has the ability to nullify any collective setting
After running the Form
Control - Flight ~ UniCopter it appears to be almost a certainty that there will be centering forces on the cyclic. Hopefully, these resisting forces (twisting of the blades) will not be too strong. Hopefully, no stronger than the longitudinal stick forces in a fixed wing. There should be no reason why the longitudinal forces cannot be trimmed out, and the lateral forces should be much weaker then the longitudinal ones due to the significantly less inertia to overcome in roll.Perhaps the inclusion of a certain amount of pre (static) twist may decrease any forces required to move and hold the cyclic stick.
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Last Revised: February 12, 2007