Robriley, "A wing would need a hollow spar which envelopes the mast where it is free to rotate with minimum effort, somewhere around the 25% chord. You might actually be better with bellcranks than a mainsheet."
That is the point of the 'elevator' on the Greenbird, the wing is perfectly balanced probably at 30% of the chord (depends on the wing) and the elevator 'arm' is the 'bell crank'. The elevator sets the wings angle of attack, the higher the angle of attack the more lift is generated, it couldn't be simpler.
If the elevator is set to neutral the wing is just a wind vane and produces no lift (or resistance) to the wind. All it takes is a little servo motor and indicator in the tail, basically it is just a trim tab.
The other thing that is being overlooked is with the wing balanced at 30% of the chord, flutter won't be a problem because it is balanced. We have to put a weighted arm forward of the ailerons on an airplane because they trail a hinge and we have to balance them to prevent flutter. Flutter can destroy a wing in seconds.
Talador
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Posted by: taladorwood@yahoo.com.au
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