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ASW 20 SPIN CHARACTERISTICS
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July 15th 04, 02:43 PM
Andy Durbin
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(Chris OCallaghan) wrote in message . com...
In fact, if you think about it, there would be a change in AoA as the
wings returned to their normal 1g state. The AoA increase at the tips
would be greatest and negligible at the roots. How large an increase
are we talking about? Pretty darn small. An amusing exercise though. A
friend once figured out how thick a layer of material a tire leaves on
the road, given normal wear. This seems on the same order.
According to Thomas, Fundamentals of Sailplane Design, the wing twist
of the ASW-20 is 2.5 deg (page 210). Isn't twist designed into a wing
to prevent the tip stalling before the root? If my numbers were
derived for 68 knots instead of 40kts they give a result that is
similar to the designed-in wing twist. In other words, the wing flex
effect appears to completely offset the protection provided by the
wing twist.
Andy
Andy Durbin