I'm scratch building a Harvard for 09 power, and am
ending up with the bottom of the wing trailing-edge
reflexed, or turned up, partly from using TE stock
cannibalized from a glider kit.
The models I've had this happen on before were great flyers.
I wonder if anyone has any thoughts on relexed flat
bottom airfoils.
By the way, I was amazed to see that the original Pietenpol
Aircamper airfoil has a slightly relexed trailing edge,
AND undercamber!

Wendell