Great Planes AccuPoint Laser Incidence Meter - GPMR4020 - Manual (Page 8)

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In some cases, however, a wing twist is desirable to add stability (washout: where the
wing tip flies at a lower angle of attack than the wing root). Typically, airplane manu-
facturers give specifications on how much washout should be in a wing. Try to get as
close as you can, but remember, it is more important that both tips have the same
amount of washout to avoid trim problems.
1. Check each wing panel at the root and the tip.
2. Record the data and fix any problems in your wing. For open structure wings, a twist
can be fixed by using a heat gun. Have a helper twist and hold the wing panel to the
correct position. Carefully use your heat gun to shrink out any wrinkles in the cover-
ing. Let the covering cool and then ask your helper to let go. Repeat until the wing is
correct. For fully sheeted wings, there is not a lot you can do to straighten the panel.
Generally, it is not a problem if the difference between wing tips is less than 1/2°.
Right Tip
Right Tip
Right Root
Right Root
Left Root
Left Root
Left Tip
Left Tip