Thread: Discussion Monotwirl Electric Autogyro
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Old Dec 31, 2006, 07:38 AM
alfoot is offline
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Joined Jan 2005
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I agree with you. Unfortunately I was not rigourous in documenting the effect of each modification individually, and sometimes I made more than one modification at a time.

The differences between movie 1 and movie 2 were:-

C of G moved aft so that the autogyro balanced level when held by rotor spindle.

Rotor mast angle increased from 5 degrees aft to 10 degrees aft.

Rotor blades made more flexible and 3mm x 3mm leading edge spar added. This effectively gave a limited flapping hinge.

Pitch of rotor blades more negative.

With these modifications, I have not noticed any motor torque effects even though I have, on occasion, applied coarse amounts of throttle. The motor, by the way, has 5 degrees of downthrust but no sidethrust. There is now no requirement for lateral trim throughout the speed range.

I feel lucky that we are discussing why the Monotwirl flies well rather than why it flies badly

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