Great Planes 27% Extra 330S ARF - GPMA1413 User Manual

Page 9

SHRINK THE COVERING

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1. Examine the airframe for wrinkles in the covering or

areas where the covering isn’t adhered to the structure. Where
necessary, use a covering iron with a protective covering sock
to shrink any wrinkles and get the covering bonded to the
framework–use an iron temperature setting around 250° F
[120° C]. And use care over seams. If too much heat is applied
over seams and edges the covering will pull away. Note: Naptha
(lighter fl uid) can be used to remove any adhesive left from the
masking tape holding the control surfaces.

ASSEMBLE THE WINGS

Hinge the Ailerons

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1. Test fi t each aileron to its matching wing with the hinges.

Note that the pivot point of the hinges should be centered on
the pivot point of the control surface–each hinge should be
exactly halfway in. Make any adjustments necessary for the
correct fi t.

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2. Remove the ailerons and take out the hinges. Add a small

drop of plastic-compatible oil to the pivot point of each hinge–be
careful not to get any oil on any other part of the hinges.

Note: When permanently hinging the ailerons to the wings in
the following step, use separate batches of 30-minute epoxy
for each wing. If you try to do it all at once, the epoxy might
harden before you fi nish.

During construction there will be several occasions where
epoxy cleanup will be necessary. Instead of wasting whole
paper towels, stack three or four paper towels on top
of each other and cut them into small squares. This will
conserve paper towels and the little squares are easier
to use. For epoxy clean up dampen the squares with
denatured alcohol.

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3. Permanently join one of the ailerons to the matching

wing with 30-minute epoxy–a good way is to use a wire or a
toothpick to spread epoxy in each hinge hole of the aileron
and the wing. Coat one side of a hinge with epoxy and fi t it
into the wing. Install the remaining four hinges in that wing
half the same way. Coat the other end of the hinges that
are sticking out, then push the aileron all the way on until