Great Planes Pete 'n Poke 40 Kit - GPMA0493 - Manual (Page 31)

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3. Cut the support doublers to fit under the supports
from the remaining 3/16" x 3/4" x 6" plywood sticks.
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4. Use epoxy to glue the support doublers to the supports.
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5. Raise the stab approximately 7" off your workbench by
placing blocks under the aft end of the fuse. Without using
any glue, fit the supports to the struts. Place the wing on top
of the supports and place weights on top of the wing to hold
it in place.
Refer to this sketch for the following two steps.
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6. Measure the distance between both stab tips and the
workbench (as indicated by the “X” in the sketch). Place
balsa sheets under one of the wheels until the distances
between both stab tips and the workbench are the same and
the stab is level (parallel with the workbench).
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7. Measure the distance between both ends of the wing
under rib W6 and the workbench (as indicated by the “Y” in
the sketch). If the distances between both wing tips and the
workbench are the same, then the wing is in alignment with
the stab. If the distances between both wing tips and the
workbench are not the same, remove the wing and the wing
struts. Sand the bottom of the taller struts until the wing
aligns with the stab.
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8. Use 30-minute epoxy to glue the front and rear supports
to the struts. For additional strength, add Great Planes
Milled Fiberglass (GPMR6165) to the epoxy. Wipe away
excess epoxy before it hardens and do not disturb the
model. Note: Although the struts go into the fuse at an angle,
they are still removable after the supports are glued on.
Now that the wing has been aligned with the stab, and the
supports have been glued into position, it’s time to check the
wing incidence.
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9. With the wing struts in position, rest the wing on top of
the supports. Lay weights on top of the wing to hold it down.
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10. Place a Great Planes AccuPoint ™ Laser Incidence Meter,
or another incidence meter suitable for measuring
incidences of model airplanes, on the stab. Be certain the
elevator is neutral (you may clamp strips of hardwood or a
straightedge across the stab and elevator to ensure that the
stab is centered). Use blocks of wood or something similar
to block-up the aft end of the fuse until the stab is level and
the incidence meter reads zero.
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11. Without disturbing the model, remove the incidence
meter from the stab and place it on the center-section of the
wing. Read the incidence. If it reads one degree positive the
incidence is correct. If the reading on the wing is less than
one degree, the aft wing struts must be shortened to lower
the trailing edge of the wing until the correct wing incidence
is achieved. If the reading on the wing is more than one
degree, the front struts must be shortened to lower the
leading edge of the wing until the correct wing incidence is
achieved. Adjust the length of the front or aft struts by
trimming both sides equally at the bottom until the wing
incidence is one degree. Note: A 1/16" change in the length
The length of the wing struts determines the wing incidence.
The wing incidence has a great effect on how the model flies.
Although you have cut the wing struts using the templates
provided, there is still the possibility for small building errors
which could change the intended wing incidence. We
strongly urge you to check the wing incidence using an
incidence meter before permanently gluing the struts into the
fuse. If you do not have an incidence meter at your immediate
disposal, you may still proceed with construction as long as
you get one and measure the wing incidence before permanently
gluing the struts into position.
The wing incidence shown on the plan is in relation to
the stab, which is zero degrees. The wing incidence is
positive 1 degree.
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