Great Planes PT-E Trainer Electric Kit - GPMA0110 - Manual (Page 35)

D 32. Shrink covering on right wing panel, top and
bottom
ADD WASHOUT AT THE WING TIPS
SPECIAL NOTE: One important flying charac-
teristic of the PT-Electnc is its ability to recover "hands-
off* from a steeply banked turn This is made possible by
building the wing with DIHEDRAL and WASHOUT
Washout is intentional and measured wing twist You will
add washout to each wingtip by twisting the wing panels
so the trailing edge will be higher than the leading
edge at both wing tips. Here's how to do i t . . .
D 1 Place the wing on your workbench with half of
the wing extending off the edge Lay some magazines
(or a "shot bag" as shown in the photo) on the wing
near the center, to hold it down.
D 2 Now grasp the wing tip and twist it so the trailing
edge goes up and the leading edge goes down As you
twist you will notice ripples forming in the covering
While holding this twist, use a heat gun to "re-
shrink" the covering Heat both the top and bottom
When you let go of the tip, you will see that the wing
will retain some of the twist.
D 5 Depending on what type of covering you have used,
you may find that, in time, some of the washout may
disappear Check it after an hour and repeat the
above process if necessary Also, re-check it periodi-
cally before you go Hying, because THIS IS A VERY
IMPORTANT REASON FOR THE STABILITY
OF YOUR PT-ELECTRIC.
ADD TRIM
D 3 Place the twisted wing panel back on your flat
work surface While holding the center of the wing
down on the surface, measure how far the trailing
edge is raised at the tip.
D 4 You must continue twisting and re- shrinking
until the trailing edge is 1/2-inch off the surface at
both tips. As an aid in getting this height correct,
you may make a small wood block 1/2" high by gluing
together pieces of scrap wood Keep this block handy
while twisting and heating, to check your progress
D 1 Add trim using covering film or self-adhesive trim
material or decals NOTE: We recommend that you
keep your trim scheme as simple as possible for ease
of application and to avoid weight build-up.
D 2 You may paint F-l, F-1A, F-1B and the motor
compartment area with any kind of hobby enamel.
(On our prototype we used Testers flat blue enamel)
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