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<DIV><FONT face=Arial size=2>Some of you guys covered the following in
various ways.</FONT></DIV>
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<DIV><FONT face=Arial size=2>There is drag due to lift because the lift vector (
force ) is not perpendicular to the flight direction. Drag is a function of
lift and that component of the lift vector in the flight direction is called
induced drag.</FONT></DIV>
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<DIV><FONT face=Arial size=2>Up, and down, both ailerons produce drag, but in
unequal amounts if the wing is in lift mode. The difference in drag for pattern
airplanes is small because of low wingloading ( low AOA ).</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The symmetrical airfoil plays a role in keeping the
drag differential low because, to generate equal lift , upright to inverted,
requires a different AOA for the non-symmetrical section.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>What did I
forget? Nat</FONT></DIV></BODY></HTML>