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Old 03-20-2019, 06:40 AM
  #57  
Joystick TX
 
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Join Date: Aug 2008
Location: N. Richland Hills, TX
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It could be a number of things. I had to remove the wing stagger or add about three pounds to the nose in order to get the plane to balance correctly. I also have -3 degrees incidence in the top wing to make sure it stalls after the lower wing. There are a lot of tradeoffs in aeronautics.

The plane is about 1 oz tail heavy right now since I added the 40cc twin. The engine is a little heavier than the 35cc and the standoffs are a little shorter, but the two changes did not cancel out exactly. It is not enough difference to cause any flying issues.
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