RE: WACO YMF
Dan,
In the long manual for the 1/5th WACO, for the top wing on page 9, step 1 and 2 are the steps for the wing dihedral brace/spar assembly. At the last W-6 RIB (outer most), the manual state 7/8" is equal to 2°. If you draw the center spar flat, at W-3/W-4 measure out the distance to the last W-6 and measure up 7/8" and that will be the 2° angle.
For the bottom wing on page 16, step 2 has the measurement at 3/4" for 2°, but the bottom wing is a little shorter from W-3/W-4 to W-6.
Check the measurements from w-3/W-4 to W-6 and adjust accordingly. On the 1/6 WACO this works out to be just under 11/16" (.7291) for the top wing and 5/8" (.625) for the bottom.