Top Flite TOPA0290 - Manual (Page 20)

Ref
er to this photo f
or the f
ollo
wing tw
o steps.
❏
12.
Both sides of the center panel will be sheeted
in tw
o sections—with the seam centered o
v
er the
main spars
.
With the assemb
ly accur
ately aligned
o
v
er the plan, star
t b
y
sheeting the aft section with
one of the skins y
ou prepared ear
lier
.
The skin
should be tr
immed so that the aft edge aligns with
the tr
ailing edge depicted on the plan and the front
edge aligns with the middle of the top spar
.
G
lue the
skin into position—aliphatic resin is pref
erred as it
will allo
w time f
or alignment.
Thic
k or medium CA
could be used, b
ut y
ou’ll ha
v
e
to w
o
rk
quic
kly
.
❏
13.
Glue the f
orw
ard sheet into position.
❏
14.
After the glue has dr
ied, remo
v
e
the center
panel plan from the b
uilding board.
Carefully cut the
jig tabs from the bottom of the r
ibs
.
Sand all the par
ts
e
v
en with the r
ibs and be
v
el the underside of the
tr
ailing edge of the top sheeting to the same angle as
the r
ibs to accommodate the bottom sheeting.
❏
15.
Using the holes in the wing bolt b
loc
ks as a
guide
, dr
ill a #7 hole through the top sheeting.
❏
16.
Dr
ill 1/16"[1.6mm] pilot holes through both
punchmar
ks in the center leading edge
.
Enlarge the
holes f
or the wing do
w
els with a 1/4"[6.4mm] dr
ill.
❏
17.
Glue pieces of lefto
v
er 3/32"[2.4mm] balsa
inside the wing where sho
wn.
Cut or dr
ill 1/2"[13mm]
holes f
o
r the ser
v
o
wires and air lines
.
❏
18.
Cut the
trailing edg
e suppor
t
from a 1/8"x
1/4"x 30"[3.2 x 6.4 x 760mm] balsa stic
k and glue it
into position.
Be
v
el the suppor
t to match the shape of
the bottom of the wing.
❏
19.
Select the hardest of the remaining 1/16"x 3"x
30"[1.6 x 75 x 760mm] balsa sheets
.
F
rom this sheet,
cut the
shear webs
as sho
wn on the plan f
or the
front and bac
k of the spars on both ends of the panel.
Glue the w
ebs into position.
❏
20.
Sheet the bottom of the center panel in tw
o
sections the same w
a
y y
ou sheeted the top
.
❏
21.
T
rim the sheeting and spars e
v
en with the r
ibs
on both ends of the center panel.
Sand the sheeting
flat and e
v
en.
❏
22.
Remember when y
ou w
e
re instr
ucted to cut
par
t w
a
y through the r
ibs on the ends of the panel?
No
w is the time to cut the rest of the w
a
y through the
ribs along the lines and remo
v
e
the mater
ial betw
een
the spars
.
No
w the center panel is complete and ma
y be set
aside while b
u
ilding the outer panels.
- 20
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