tubes into their appropriate locations—DO NOT
GET GLUE ON THE WIRE TORQUE ROD ARMS.
Carefully wipe off any excess glue. This completed
assembly can now be carefully glued directly to the
trailing edge of the center section and allowed to
dry.
7. The center section, from about the center of W-13,
back to the trailing edge can now be sheeted with
3/32" balsa—note grain direction. At the leading edge
of the center section, cut, fit and glue in place a
piece of 3/32" x 1" leading edge sheeting. For now,
this completes the center section. You will add the
last piece of top sheeting after the forward wing
hold-down dowel is installed.
8. In this step we want to prepare each of the required
components—the top and bottom spars, the 3/8" x
1/2" front L.E. and the rear 1/4" x 3/8" T.E.—with the
proper dihedral angle at their inboard ends. The
cross-section of the wing that is shown on the plans
is ideal forthis purpose. Simply lay, for instance, the
b o t t o m 1 / 4 " x 1/2" balsa spar in place over this draw-
ing. Note that the outboard end iscutat90degs.; but
that the inboard end must be cut at an angle to
achieve the required 3/4" per panel dihedral angle.
Make two of these bottom spars. Now repeat this
process with the top spars, the leading edges and
the trail ing edges (note that the length of the leading
edges is developed from the top view of the wing
plan). The inboard edges of the 1/4" x 1-1/2" lower
leading edges should be first cut at 90 degs. and
then slightly chamfered to match the needed
dihedral angle.
9. Start construction by first pinning the 1/4" x 1-1/2"
lower leading edges in place, directly overthe plans.
Note that the inboard edges of these two parts ter-
minate at the outer edges of the two outboard
W-1A's in the center section. Now pin the 3/32" x 1"
bottom trailing edge planking in place. Glue the 1/4"
x 3/8" trailing edges in place on the top, rear of the
3/32"trailing edge sheet. From the 3/32" x 1/4" x 36"
stock provided, cut, fit and glue each of the bottom
capstrips in place—pin to secure. Using the 3/32"
sheet balsa provided, measure, cut and glue the in-
board bottom wing sheeting in place—note grain
direction. Locate the two remaining W-6 wingtips,
clean their edges and glue in place. The bottom 1/4"
x 1/2" spars (angled ends inboard) are now glued in
place to the bottom wing sheet and capstrips. Now
glue all required W-2A, W-2B, W-3, W-3P and W-4 ribs
in place, making sure they are vertical to the work
surface.
10. Locate and remove the remaining twelve W-5 rear
angled ribs from their die-cut sheets. Note on the
plans that the forward ends of these ribs are
chamfered to fit against the W-3 rib sides and that
their placement does not interfere with the place-
ment of the top spar slots. Also note that the inner-
most W-5 rib must be trimmed slightly so as not to in-
terfere with the placement of the main dihedral
brace. Glue W-5's in place. Glue all of the wingtip
braces (W-7, W-8, W-9, W-10, and W-15) in place on
the W-6 wingtips. Note that W-7, W-9 and W-10 need
to have their inboard ends chamfered with a sanding
block to fit flush to the outer face of W-3.
11. Now take the center section which was asembled
earlier and fit it to one of the wing panels. Tilt it until
the two arms of the W-11 plydihedral braces fit flush
to the front and rear bottom sheeting and the center
brace assembly is correctly positioned against the
bottom spar. Check this fit to be sure all com-
ponents fit nicely. Trim if needed to get proper fit.
Prop and/or pin this center section in this position as
you will use it as a guide for the remaining wing
panel parts. Remember not to glue anything to the
center section yet; it's only in place for spacing pur-
poses.
12. Glue the front 3/8" x 1/2"" leading edge in place on top
of the lower 1/4" x 1-1/2" leading edge and against the
front of each full and half rib (angled end inboard to
fit against tilted center section). Glue the top 1/4" x
1/2" spar in place (angled end inboard). Cut, fit and
glue the 3/32" x 1 "leading and trailing edge planking
in place—pin or tape to hold. Remove the center
section from the wing panel and repeat the above
steps on the remaining panel.
13. Cut, fit and glue all top 3/32" x 1/4" capstrips in place
on all of the ribs and half ribs.
14. Remove the wing panels from the work surface. In-
spect them for any dried globs of glue, remove these
with a #11 X-acto knife. Tape or hold the two wing
panels together with the bottoms of each facing the
other—align carefully. Use your sanding block to
now shape the forward wingtips identically with
each other and the curves shown on the plans. With
the exception of the inboard ends, use your sanding
block to carefully "match" the wing panels, leading
edges, tips and trailing edges. Separate the panels
and use a sanding block with light paper over all of
the panel's surfaces to smooth them for later cover-
ing, after final assembly. The three lower wing com-
ponents are now complete and should be set aside
for later assembly.
TAIL GROUP
The tail group of yourEIder Biplane is built directly over the
plans in a quite straight-forward manner. Note there are
options open to you with these parts in terms of shape.
The stab's gentle curves which terminate in sharp
points at the trailing edge of the elevators give a certain
"look," which can be changed by rounding the outboard
trail ing edges of the elevators. This "softens" the look of
these shapes. The same thing can be done to the fin and
rudder, top and bottom—looks nice. As shown, you can
also scallop the trailing edges of the rudder and
elevators to give yet another different look.
1 . Start with the stab. Build directly over the plans
which have been covered with the clear backing
from MonoKote or food wrap. Position the two S-1
7
Содержание Elder Biplane RC-37
Страница 20: ...150029...
