Top-flite TOPA0135 User Manual download pdf (Page 42)

❏ 5. Remove the wing and finish drilling the holes

with a #10 (13/64") drill bit through the wing mount

blocks. Tap the holes with a 1/4-20 tap. Add a

couple drops of thin CA to the holes to harden the

threads, then re-tap the holes after the CA has

fully cured.

BUILD THE WING FILLET

❏ 1. With the wing bolted to the fuselage. Mark a

reference line on both sides where the wing trailing

edge and leading edge contacts the fuselage.

Remove the wing from the fuselage.

❏❏2. Place a straight edge on the fuselage at the

indication marks you made in the previous step

and draw a line from the rear indication line about

3" aft.

❏❏3. Trial fit a 1/32" plywood Wing Fillet Base

on the wing saddle of the fuselage. Make

adjustments if required. Use a hobby knife with a

#11 blade to lightly scribe a line on the fillet base

from the corner where it meets the rear of the

fuselage out to the edge–cut only through the

bottom layer of the three-ply plywood.

❏❏4. Tape the fillet base to the plywood saddles

in a few spots.

❏ 5. Perform the previous three steps for the other

fillet base.

❏ 6. Tape a layer of waxed paper or plastic food

wrap to the top surface of the wing in the wing

saddle area. Bolt the wing firmly onto the fuselage.

Check to make sure there is no interference with

the wing saddle and make adjustments if required.

❏ 7. With the wing bolted to the fuselage, carefully

“bend-up” the portion of the wing fillet at the scribe

line and align it on the fuselage with the line you

drew earlier. When the wing fillet is in position, glue

the wing fillet to the fuselage with medium CA.

❏ 8. Use a sharp knife or a Moto-Tool with a

sanding drum to adjust the “curve” of both the fillet

bases so it meets the trailing edge of the flap.

NOTE: The wing fillet may be built up

with small balsa blocks or you may use the

technique described below.

❏ 9. Cut the 24" x 1/4" balsa triangle stick half. Mark

both halves every 1/2" for the first 4" then two more

marks 1" after that. Use a razor saw to cut about 3/4

the way through the triangle stock at the marks.

❏ 10. Glue the triangle stock to the fillet base and

the fuselage with medium CA.

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Top-flite TOPA0135 User Manual Page 42

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