Great Planes Profile 38 - GPMA0487 - Manual (Page 26)

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4. Slide the upper booms over the wing.
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5. Insert the stabilizer tips in the boom. Position the stabilizer
center between the booms so that the ends of the stabilizer
center are against the booms. With the booms and the
bottom of the fins resting on your building table and the
booms perpendicular to the table, measure the distance
between the booms at the leading and trailing edges of the
wing and at the leading edge of the stabilizer. All three
measurements must be the same. If they are not, you may
need to slightly trim the ends of the stabilizer center or the
slots in the wing.
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6. Trim the stabilizer joiners so that the stabilizer center
fits against the boom and the joiner fits between the
stabilizer center leading edge, trailing edge and outer rib.
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7. Once the booms are parallel and the stabilizer tips fit
well in the stabilizer center, use 30-minute epoxy to glue the
main and upper booms to the wing, the stabilizer tips to the
booms and the stabilizer center to the booms and stabilizer
joiner. Make sure the main booms are perpendicular to your
building table. Check the measurements between the
booms before the epoxy hardens. Use a paper towel
dampened with denatured alcohol to wipe off any excess
epoxy before it hardens.
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8. Use balsa filler to fill any open joints between the main
boom, the wing and the upper boom. Once the balsa filler
has dried, sand the upper boom so that it is flush with the
main boom.
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1. Trim and sand the inboard end of the shaped balsa
aileron to match the angle of the main boom. Leave a 3/32"
[2mm] gap between the aileron and the main boom. Mark
the three hinge locations on the aileron and the trailing edge
of the wing. Note: The center of the hinge should be in the
center of the 1/2" [13mm] hinge block.
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2. Mark the centerline on the leading edge of the
aileron and the trailing edge of the wing. Cut the hinge slots
in the wing and aileron and temporarily install the aileron on
the wing. Use tape to hold the aileron tight against the
trailing edge of the wing.
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3. Trim and sand the aileron to match the shape of the
wing tip.
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4. Draw a line 3/32" [2mm] back from the leading edge
on both sides of the aileron. Use a razor plane and a bar
Install the Ailerons
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