RE: I need help locating CG on straight flying wing
Be sure you DO include the ailerons in the chord measurement. They are part of the wing.
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For a non-symmetrical airfoil, the reflex (trailing edge up) will be somewhat more than a symmetrical airfoil would need.
I used about an 1/8" up on the Krafty modification.
The SE needs a lot less, trim can do that once it's flying.