Top Flite TOPA0290 - Manual (Page 22)

❏❏
12.
Remo
v
e
the top spar from the assemb
ly
.
Apply a bead of medium or thic
k CA along the top
edge of the spar w
e
b
, then reposition the top spar
.
Mak
e
sure
W2 is still at the correct angle using the
dihedr
al gauge
.
❏❏
13.
Glue the die-cut 1/8" [3.2mm] balsa
inner
sub leading edg
e
into position.
❏❏
14.
Prepare the top of the wing f
or sheeting b
y
tr
imming and sanding the sub leading edges
, the
aileron ba
y sub tr
ailing edge
, the flap ba
y tr
ailing
edge and the top spar e
v
en with the tops of the r
ibs
.
❏❏
15.
T
rim one of the aft skins to fit the wing so
that the front edge aligns with the
mid
dle
of the top
spar and the aft edge aligns with the middle of the flap ba
y sub tr
ailing edge
.
The skin should e
xtend
1/16" [1.6mm] or so past the aileron ba
y sub tr
ailing
edge to allo
w f
or tr
imming later
.
❏❏
16.
Glue the aft skin into position.
Aliphatic resin is
recommended as it will allo
w time f
o
r positioning.
Use
w
e
ights and
T-pins to hold the skin in position while the
glue dr
ies
.The rest of the tr
ailing edge betw
een the
W9
ribs at the wing tip will be sheeted later
.
Ref
er to this photo f
or the f
ollo
wing tw
o steps.
❏❏
17.
Cut and tr
im one of the f
orw
ard skins to fit
the wing, then glue it into position.
Use a piece of
lefto
v
er sheeting f
or the small cor
ner at the leading
edge where the front sheet w
on’t reach.
Use w
eights
and/or
T
-pins to hold the sheeting do
wn while the
glue dr
ies
.
❏❏
18.
If
not
b
uilding flaps
, test fit one of the die-cut
1/16" [1.6mm] balsa
flap skins
to the wing.
The tr
ailing
edge of the skin should e
xtend 2-1/8" [54mm] aft of the
top wing skin.
Cut out the slots f
or the corr
ugations and
tr
im the flap skin as necessar
y f
or a good fit, then glue
the skin into position.
If y
ou
are
b
uilding w
o
rking flaps
,
tr
im a 7/16" x 17-3/4" [11 x 435mm] str
ip from a piece
of lefto
ver 1/16" [1.6mm] hard balsa.
Glue the str
ip o
ver
the flap ba
y tr
ailing edge
.
❏❏
19.
After the glue on all of the wing sheeting has
dr
ied, remo
v
e
the wing from the b
uilding board.
Ref
er to this photo f
or the f
ollo
wing tw
o steps.
❏❏
20.
Flip the wing o
v
er and la
y it on y
our
w
o
rkbench.
Cut tw
o 3-3/4" [95mm] long
landing
g
ear rails
from the 1/4" x 1/2" x 16" [6.4 x 13 x
410mm] bass
w
ood stic
k.
Use 30-min
ute epo
xy to
glue the r
ails into position.
F
or additional strength,
milled glass fibers could be added to the mixture
.
This will allo
w y
ou to b
uild up small fillets without the
glue dr
ipping a
w
a
y
from the joints
.
❏❏
21.
While the epo
xy on the landing gear r
ails is
hardening, mak
e the
ser
v
o
hatc
h rails
from a 1/4" x
3/8" x 36" [6.4 x 9.5 x 910mm] bass
w
ood stic
k and glue
them into position.
Be cer
tain to glue the aileron hatch
rails in the tw
o inboard
W8 r
ibs as sho
wn on the plan.
Note:
If not b
uilding w
o
rking flaps
, there is no need to
cut and glue in the ser
vo
r
ails f
or the flaps
.
❏
22.
Retur
n to step 4 and b
uild the r
ight wing panel.
Don't f
o
rget to b
uild o
v
er the
right
wing plan.
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