At 09:23 PM 2/21/2006, Mark Drela wrote:
The all-moving Supra stab is aerodynamically balanced,
so the stab servo loads from the airload are minimal.
The only loads the stab servo will see is due to the
inertial load when the boom "cracks the whip" in the zoom.
That is one of the reasons my stabs pivot around the rear wire. I
also clamp the stab to the front wire with very small wheel
collars. I never lose a stab in flight and the weight of the front
wire and wheel collars almost balances the stab about the pivot.
Clamping the front wire to the horn also means that the weight of the
stab horn also contributes to balancing the stab about the pivot. I
then sweep the stab as necessary to put the pivot at 25% MAC. I
started doing this back in 1974 to reduce the chances of stab
flutter. Those obsessed with minimizing weight could leave off the
wheel collars and still reduce the inertia loads. :-)
Chuck Anderson
PS The stab sweep also helps me identify my model in a gaggle. :-)
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