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STAGE 9: ATTACHING THE UPPER WING, CABLING AND BRACING
Cabane struts and preparation:
The tops of the rear undercarriage brackets
should protrude slightly above ribs CAW03
at Frame "C." Drill a #69 hole into the
casting on each side and glue in an eyebolt
you have trimmed so the ring sits as close as
possible to the wing. Fig.35.
Note the stamped numbers on the insides
of the lower brackets of the cabane struts.
Numbers one and three attach to the left
side; struts two and four attach to the right.
See Plan 04. Referring to Fig.36, drill #69
holes where indicated on the cabane struts.
Cut short and glue in eight of the remain-
ing ten rigging eyes. The two exception are
left long and are used to pin the lower ends
of cabane struts #1 and #2 to Frame "A."
Attach these struts first to the fuselage.
Confirm the distance between the holes on
compression bars CAW25, then attach the
rear cabane struts (three and four) at Frame
"C" so the paired spacing of the top holes
matches that of the holes in CAW25.
Upper wing:
Tie off the upper wing ailerons to avoid
damaging them. Set the upper wing into
place with the upper ends of the cabane
struts inside the attachment brackets on the
inner compression bars. Pin the wing in
place using four false bolts (CAW41),
inserted with the heads toward the center-
line of the aircraft. Check the level of your
work surface before checking that the wing
is level. Chances are good that if the wing
looks off it is because your table slopes. The
holes through parts CAW40 and CAW25
are larger than the diameter of the false
bolts to allow room for adjustment. When
you are satisfied that the wing is level, glue
the joints. Trim the bolts so they protrude
slightly.
The interplane struts are made from four 2
25/32" lengths cut from the 3/32" x 1/4"
wood strip. Cut a lengthwise slot into each
end of the struts, that measures 1/32" wide
by 1/16" deep, for the end fittings CAW42.
Next, sand the struts to an oval cross sec-
tion. Referring to Fig.37, glue the end fit-
tings into the slots, making sure the sides
with the cast nuts all face the same way, and
slightly taper the struts from about 3/16"
from the ends. If desired, stain the struts
gold-mahogany and finish with varnish or
shellac.
Refer to Plan 01. The interplane struts are
positioned outboard of the fittings on com-
pression bars CAW25, with the nuts on
CAW42 facing out. Secure these with false
bolts as you did with the cabane struts, and
check the wing's alignment before gluing
the false bolts in place. Trim the bolt ends so
that they slightly protrude through the nuts.
Parts List For Stage 9
CAW40
Cabane struts (4 numbered)
CAW41
False bolts
CAW42
End fittings for interplane struts
CAF75
Pitot tube
CAF76
Fuel pressure pump
CAF77
Cabane bracing tensioner
WP3629
Interplane struts
W042
Turnbuckles
WP1205
Interplane bracing wire
WP0434B
Rigging eyes
WP40223SEC
Piping
Fuel pressure pump & pitot tube:
If you are installing all of the plumbing,
drill a #69 hole in the underside of the fuel
pressure pump (CAF76). The two cylinders
are on the top. Glue the pump to the out-
side center of the right front cabane strut so
the little propeller is to the rear. Use a
length of 22 AWG bare copper wire to run
from the pump, down the strut, behind the
instrument panel to the bottom fitting of
the air pressure gauge. Try to make the run
as neat and short as possible. The copper
wire may be secured to the strut by a thin
strip of copper tape.
Drill a #69 hole in the bottom of the pitot
tube casting (CAF75) for the plumbing.
Drill a shallow 1/16" hole in the outside of
the right front interplane strut, about 7/8"
down, and glue the matching stud on part
CAF75 into this hole. Using 22 AWG bare
copper wire, run the piping from the hole
in the pitot tube casting down the strut,
into the wing and through the space
between the leading edge and the front spar
to the fuselage, and through the slot in
which the lower wing is attached. The pip-
ing then runs up behind the right air intake
tube to the back of the air speed gauge on
the instrument panel. This is a difficult
connection to make with a single continu-
ous run of wire. It is recommended that
you join a short run down from the air
speed gauge to the longer run through the
wing at the slot in CAF03 where the lower
wing joins the fuselage. A daub of glue cov-
ered with copper paint will look like a pipe
joint, but will be invisible unless you dis-
play your model on a mirror. Be careful to
leave room to run the aileron control cable
through the same slot in CAF03.
Struts bracing & aileron cabling:
Refer to Fig.38 and the Full-size Plans.
Use turnbuckles (W042) at the lower end
of each run, and Metal-gray thread
(WP1205) to rig the cross bracing. Make
sure the braces are snug, but do not over-
tighten them.
23
1 ea.
Britannia castings
12
Britannia castings
8
Britannia castings
1
Britannia casting
1
Britannia casting
1
Britannia casting
4
3/32 x 1/4 basswood
10
Britannia castings
Metal-gray thread
12
Brass eyebolts
22 AWG copper wire
Begin between the front cabane struts. Run
the metal-gray thread through the tear-drop
shaped tensioner (CAF77) and tie off the
ends to the upper brass rigging eyes. Run a
second length of thread through CAF77
and tie off the ends to the inner rigging
eyes you used to pin the cabane struts to
Frame "A." Next rig the front to back
cabane bracing through the appropriate
rigging eyes.
Bracing between the interplane struts is tied
off at the waist on the strut end fittings.
The front flying wires go from the rigging
eyes in Frame "A" to the tops of the front
interplane struts and are doubled. All the
other braces are single strand. The rear
flying wires go from the rigging eyes in the
rear undercarriage brackets up to the tops
of the rear interplane struts. There is a
turnbuckle at each lower end. The landing
wires run from the bottoms of the inter-
plane struts to the top rigging eyes of the
cabane struts, with a turnbuckle at each
lower end. Finish up by tying the cross
bracing between the interplane struts, again
using a turnbuckle at each lower end.
Temporarily fix the ailerons and the control
stick into their neutral position. Stand the
model on its nose, using a block of wood to
clear the machine guns, and , working from
the bottom, install the aileron cables as a
single continuous run from one hole in the
aileron crank, through the eyebolt on the
same side, back to the opposite gap in
CAF03 and between the leading edge and
front spar of the lower wing, around the
pulley, to the lower horn and anchor, then
up to the upper anchor and horn, around
the pulley, between the leading edge and
front spar of the upper wing, and similarly
back down to the other hole on the aileron
crank. Snug this up and tie it off at the
aileron crank, and glue cable where it passes
through the anchors. When everything is
released, moving the control stick to one
side should raise the ailerons on that side
and lower the ones on the opposite side as
in Fig.40.
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