Model Airways SOPWITH CAMEL F.1 Instruction Manual page 8

Parts List For Stage 2 (continued)
WP3671 Leading edges
WP3648 Front spars
WP3631 Rear spars
WP3625 Front aileron spars
WP3618 Rear aileron spars
Wing braces
WP1205 Rigging cable
WP161K Wing trailing edges
WP0976 Trailing edge bands
Wing ribs; rib caps:
After cutting loose all of the above refer-
enced ribs, lightly sand them to remove sur-
face char from the laser, then sort them by
number.
To facilitate making the cap strips overlap
ribs CAW02, 04, 05, 06 and 07 equally to
each side, make a simple jig by gluing a 2
1/2" length of the 1/32" x 3/32" rib cap
stock to a scrap block of soft wood, as in
Fig.06. Pin the rib to be glued onto the
strip through some of the cutouts, apply
carpenter's wood glue to the rib edge and
use T-pins against the rib cap to clamp the
cap to the rib. Repeat for the opposite edge.
Note the photograph "Rib Pins". Use of a
hair drier will speed up the process. The
"waist" on ribs CAW05 and CAW06 make
them particularly fragile, requiring extra
care when gluing on their cap strips.
The 8 parts CAW03 are laminated in pairs
to make 4 double-thick ribs before cap
strips are glued on, and the 2 ribs CAW01
are glued flush to one edge of the cap strip
to make left and right capped ribs. Fig.06
shows the left hand one (looking from back
to front of the finished airplane). Therefore,
instead of using the jig, lay a piece of waxed
paper on the scrap wood to avoid gluing
those ribs to it.
Inserting the spars; leading edges;
nose ribs:
Slight variation in the provided wood strips
is to be expected, therefore test fit all of the
spars, including the aileron spars, to the
ribs and sand down the spars as needed to
attain a snug fit.
Referring to Plan 03.1, slide all of the
upper wing ribs, except CAW 06, 07 and
08 onto the front (5/32" square stock) and
rear (1/8" square stock) spars. Make sure
that the flush sides of ribs CAW01 face the
center of the wing. Once everything is lined
up, glue the ribs into place using a small
brush and thinned wood glue.
Once the glue is dry, cut the front spar to
length and taper the ends outboard of the
first rib at each end to fit the narrower slot
in ribs CAW06 and glue those ribs in place.
5/32" x 3/16" basswood strips
5/32" x 5/32" basswood strips
1/8" x 1/8" basswood strips
3/32" x 3/32" basswood strips
1/16" x 1/16" basswood strips
Metal-gray thread
3/64" brass rod
1/4" Adhesive copper tape
Insert the aileron spars (3/32" and 1/16"
square stock) through the holes in ribs
CAW05 and 06, then glue and cut to
length according to the plan. Attach aileron
rib CAW07, being careful to leave a gap
between it and the next inboard rib. This
will allow the ailerons to move when they
later are cut free. Locate the wing angle
braces on Plan T.03. Cut them from 1/16"
square lumber and glue into place.
Dry fit the leading edge lumber (5/32" x
3/16" x 24") against the front edge of the
ribs to check for uniform fit and to make
sure that the nose ribs (CAW08) will fit
snugly between the front spar and the lead-
ing edge. If necessary, use a long strip of
sandpaper, affixed to the same length
straight, flat piece of wood, to lightly sand
the leading edges of the ribs.
Trim spar ends and notch them, using a
round needle file, to fit the wingtips
CAW18. You also will need to file a notch
in the front spar rib CAW05 meets it. File
and bend the wing tip if needed so that all
ends make contact with the spars and ribs.
Glue the wing tip in place using CA and
repeat for the other wing tip.
Next, hold the 3/16" side of the leading
edge lumber in place to determine its prop-
er length and where to cut notches to fit
over the end of the wing tip casting – see
Fig.10. Before gluing the leading edge to
the ribs, locate the aileron pulleys
(CAW24) on Plan 03 and drill the appro-
priate holes in the leading edge of the front
spar. Glue the leading edge in place and
taper the ends down to the wingtips from
the last rib the leading edge attaches to.
Glue the leading edge in place, 3/16" edge
against the ribs and carefully sand it to a
rounded profile, as in the ribs cross-sections
on Plan 03. Careful use of a block plane
will speed up the process. Glue the nose
ribs in place. Now is the time to varnish
and tint the wing assembly. Although later
steps will expose unvarnished edges, these
can be touched up with a brush.
Finally, build the lower wing to the same
stage of completion and saw apart per
Plan 03.2.
Rib Pins
Compression bars; pulleys;
trailing edge; visibility cutout;
rigging:
Glue the aileron pulleys in place using
CA glue.
Drill #75 size holes through both ends of
the compression bars (CAW20 and 25)
where the round flange meets the angle
bracket – see Fig.12 detail. Next, locate and
glue the compression bars in place, hanging
bars CAW20 from the top and attaching
CAW25 from the bottom, so the eyes point
down from the upper wing. All of the
compression bars are hung from the top in
the lower wing, which positions the eyes on
CAW25 pointing up. It is important that
the outboard upper and lower parts
CAW25 line up on the two wings, because
this is where the wing struts will attach.
To frame the visibility cutout in the upper
wing, first make sure that tabs that overlap
the spars of the center compression bar are
filed down to a maximum of 1/32" thick.
Next cut four 9/32" lengths of 1/32" x
3/32" wood strip and glue these supports to
the front and rear spars edges, against ribs
CAW01, so that they extend from the outer
spar edges into the center space. Cut six
roughly 3/4" lengths of the same wood
and plank three of them onto each pair
of supports.
The easiest way to rig the wing bracing
wires is to run a continuous length of
WP1205 thread from one end of the wing
to the other and then repeat the process to
create the X-pattern on Plan 03. Each time
you come to the front end of a compression
bar, slip a turnbuckle (W042) onto the
thread, through both holes, before running
the thread through the holes you drilled in
the compression bars. After stringing the
thread all the way to the opposite end of
the wing, secure the end, then gently
tighten the thread, working backward to
where you started. At each front end of a
compression bar, slide a turnbuckle up to
the bar then secure the thread and turn-
buckle with CA glue. At each rear end of a
compression bar secure the thread with CA
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