©2019 Moustache Model Works, LLC
13
20cc DHC
-
2 Beaver Instruction Manual
8.
Glue the laser
-
cut 2.5mm balsa flap
and aileron hatch fillers in place.
11.
Remove the ribs from the laser cut
sheets, including R
-
1 from 3mm lite
-
ply.
12.
Glue the tip of the Wing Sub LE to the
Wing Sub LE. Use a straightedge to
ensure proper alignment.
7.
Trim and sand the capstrips to length
from the 2.5mm x 10mm sticks and
glue them in place.
9.
Glue the laser
-
cut 6mm balsa trailing
edge in place on the trailing edge
sheeting. Note the etched label is
meant to be right
-
side
-
up and facing
forward. The root end of the TE has a
2° angle to place the root rib at the
proper angle to account for the wing
dihedral.
13.
Glue the Wing Mount Doubler in place
onto R
-
1, on the outboard side of the
rib (doubler will be inside the wing).
14.
Glue and press the ¼
-
20 blind nut into
place on the Wing Mount Doubler. 5
-
minute epoxy is good for this. Again,
the nut will be inside the wing once
assembled.
15.
Trim the bottom spar to length, a little
longer than needed. As with the
sheeting, excess length will be sanded
flush with the root and tip ribs after
assembly.
16.
Using a rib at the root, one at the tip,
and one or two in the middle, glue the
bottom spar to the leading edge sheet-
ing, the cap strips, and the hatch fill-
ers. NOTE that the spar overhangs
the leading edge sheeting by
1/8”
(3mm) to provide a better joint for
the cap strips.
17.
Before gluing the ribs in place, perform a dry assembly of the ribs, upper spar, Sub LE,
Ply Shear Web, and wing tube sleeve to familiarize yourself with how everything fits to-
gether. Points to note:
a.
The 1.5mm Ply Shear Web has a 2° angle on the root end and is the primary tool for
getting the proper angle on the root rib. It also fits rather tightly into place.
b.
There is a slight taper to the chord of the wing between R
-
1 and R
-
3. When gluing
the Sub LE in place, glue from R
-
3 outboard first, then come back and glue it to R
-
2
and R
-
1, bending it into place.
c.
The airfoil is flat from the spar to the trailing edge, but from the spar forward curves
upward to the leading edge.
18.
Disassemble the dry assembly.
10.
Inspect the spars for bow. Select,
pair, and mark the spars so the bow of
the upper and lower spars counteracts
each other, meaning either the con-
cave or the convex sides face each
other. This step ensures the spars do
not make the wing bow over time.
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