Top-flite TOPA0135 User Manual download pdf (Page 29)

Skip this step if installing fixed gear

❏ 9. Locate wing ribs W-5 and W-6, and 1/16"

plywood doublers 5-R and 6-R (4 each). Use

thick CA to glue the ribs and doublers together.

Remove the shaded area with a hobby knife or

razor saw.

Okay, the prep work is behind you, so now that the

dull stuff is done, let’s build the outer wing panels

so you’ll have something to show when your

friends drop in to check on your progress!

BUILD THE WING PANELS

❏❏1. Place a Wing Panel plan on a flat building

board and cover it with waxed paper.

Cutting the

wing panel sections apart makes handling easier.

❏❏2. Pin a Top Spar to the building board at four

or five locations using the cross-pinning technique

shown in the sketch. The extra length should

extend past the root end of the plan.

❏❏3. Position the die-cut 3/32" balsa ribs W-2

through W-11 on the spar, aligned over their

appropriate locations on the plans. Push rib W-2

forward against the spar. Make sure each rib is

vertical and the jig tabs are contacting the

building board

then glue W-2 through W-11 to

the spar.

❏❏4. Test fit the die-cut 1/8" balsa Aft Inner

Spar in the notches of ribs W-2 through W-7. The

aft edge of the inner spar will be slightly higher

than the ribs to allow for trimming later. Sight down

the trailing edges of the ribs to make sure they are

aligned. Use paper shims under the jig tabs to

raise any ribs that are low. Glue the aft inner spar

to the ribs making sure all the jig tabs are

contacting the work surface.

❏❏5. Trim the end of the aft inner spar flush with

W-7. Bevel the notches in ribs W-7 through W-11

and the notches in the die-cut 1/8" balsa Aft Outer

Spar to account for the forward sweep of the spar.

Test fit but do not glue the aft outer spar in ribs

W-7 through W-11. Fit but do not glue the die-cut

3/32" balsa Aileron Root Rib W-7B. Make sure

the ribs remain aligned over the plans when the aft

outer spar is in position.

❏❏6. Sight down the trailing edge of the ribs and

make sure they are aligned. Use paper shims to

raise any low ribs if required. Slip three layers of

waxed paper between W-7B and W-7 up to the

front edge of the aft outer spar then glue W-7B to

W-7. Glue the aft outer spar to the ribs making

sure all the jig tabs are contacting the

work surface.

❏❏7. Fit but do not glue the die-cut 1/8" plywood

Dowel Plate (AFT) into rib W-2 then add rib W-1 to

the assembly. Still without using any glue, press

the Bottom Main Spar into the notches and check

for a flush fit at each rib. Confirm that the spar

extends past the dowel plate and rib W-11. Glue

the bottom spar to all ribs except W-1.

❏❏

8. Draw a line connecting the two punch marks

on the die-cut 1/8" plywood Dihedral Gauge.

❏❏9. Use the dihedral gauge and the dowel

plate to set the angle and position of W-1 (see

the photo at step 10). The line on the dihedral

gauge must line up with the offset reference line

on the plans.

The location of the rib drawn on the

plans indicates the centerline of the rib – not

where the top of the rib contacts the plans.

Because of this, the top of the will be slightly offset

to the right (or left for the other wing panel).

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Top-flite TOPA0135 User Manual Page 29

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