khodges

My Feedback: (1)

I was studying the plans for my next build, a 1/4 scale Birddog from Vaillancourt plans. On the wing sheet it says the wingtips from such and such rib to the tip has 1-1/2 degrees of washout. Is this already figured in to the layout and shape of the ribs, or do I have to "warp" this portion to get the washout to the required amount, and if so, what's the best way to figure this amount? I haven't built just from plans before, and there's no written instructions to guide me. Thanks for the help.

SoCal GliderGuider

Sounds like you might have to jack up the TE as you build the wing. Depends on how the construction was designed.

feihu-RCU

If the plans call for building on a wing jig, then set the root rib at zero and set the tip rib at 1 1/2 degrees trailing edge up. You can add holes in the wing ribs for wing jig building.
If the plans call for building on a flat surface with cut off tabs on the trailing edge of the ribs, then copy the root rib on a sheet of paper and draw a straight reference line to represent the table (flat surface). Do the same for the wing tip rib and verify that there is 1 1/2 degrees washout. If the plans do not show the cutoff tabs, you can add them if you want to build on a flat surface.