Top Flite TOPA0305 Part 1 User Manual

Page 28

22.

Use a bar sander and 80-grit sandpaper

to sand the sheeting, spars and

so they are

flush with root rib

and tip rib

W14.

23.

Mark the locations of the aileron hinge

slots on the outer wing TE and the aileron

LE,

you will know where to cut the hinge slots after the
wing and aileron are sheeted. Mark the location of
the flap hinge blocks the same way.

24.

Return to step

on page

and finish the

left wing panel.

BUILD THE CENTER SECTION

Position the center section wing plan (which is

attached

the right wing plan) over your building

board and cover the plan with wax paper.

Use thick or medium

to glue two die-cut

118"

plywood

dowel rib doublers W1D

and one

bolt plate rib doubler W1P

to the sides of the die-

cut

118"

balsa ribs

as shown on the plan. Pay

careful attention to which sides of the ribs the
doublers are glued.

Glue two sets of

1/8"

die-cut plywood

wing

bolt plates

together to make two

114"

plates.

Glue the

1/8"

die-cut plywood

leading edge

doubler (W21)

to the die-cut

1/8"

plywood

center

leading edge (W21A)

so the

bottoms

of the

notches

align.

W21A

is narrower than

W21

so the

top and bottom edges will be offset

1/16".

5. Test fit the wing bolt plate in the notches of

the ribs where shown on the plans. Adjust the

notches

necessary so the bolt plates fit.

Remove the balsa from both

ribs between

the notches of the dowel doublers.

With a straightedge and a ballpoint pen mark

two vertical lines

1/16"

ahead of and behind the

spar notches on the

outside

of both of the

ribs,

that have only the

W1P

doublers glued to them.

Use a sharp hobby knife to cut halfway through the

balsa along the lines. This section of balsa will be

removed to accommodate the spar joiners when it
is time to join the wing.

8. Cut

one

11"

long piece for the

bottom center

spar

and one

9-1/4"

long piece for the

top center

- 2 7 -

spar

from a

1 / 4

3/8"

x 24"

basswood stick. Pin

only the ends

of the

11"

bottom center spar to

your building board over its location on the plan.

not stick the T-pins through the basswood spar but
insert them in a crossed fashion over the spar to
hold it to your building board.

Now

for

the

fun

part.

. .

Fit the ribs onto the die-cut

1/8"

plywood

center spar web W19.

Make sure the ribs go all

the way down in the center spar web. Deepen the

notches (in the ribs or the spar web)

necessary.

Fit the assembly onto the bottom spar.

10.

Join the die-cut

1/8"

plywood

aft center spar

W20,

the center leading edge assembly

(W21

and

W21A),

the

top spar, and the wing bolt plates to

the ribs. Make sure the ribs align with the plan.

11.

Pin small blocks of leftover balsa to the plan

next to the

ribs, aligning them over the plan,

and place weights on top of the ribs and spars to
hold the jig tabs to the building board. Use a small
square to make sure the

ribs are vertical.

12.

Use medium or thin

to glue all joints

excepting the top spar.

Do not use large amounts

of CA and do not build up large fillets. This
will make it easier

join other parts to the

assembly. You will be reminded

reinforce all glue

joints later.

13.

Remove the top spar. Glue it back in place.