Installing Wing Strut, Kingpost, And Wing Skid Support Pads And Fittings; Building And Installing The Upper Wing Ailerons; Installing The Aileron Control Sheaves - Model Airways CURTISS JN-4D JENNY Instruction Manual

10.Installing Wing Strut, Kingpost,
and Wing Skid Support Pads and
Fittings
The support pads are fitted on each side of
the cap strips in way of the struts. For the
lower wing, the inboard pads are on top of
the wing. The outboard pads are on both the
top and bottom of the wing. The bottom pads
are supports for the wing skid fittings. On
the upper wing center section, the pads are
located only on the bottom side. On the main
upper wing panels, install the pads on both
sides at the outer wing strut location. The
underside is support for the wing struts, and
the top side provides support for the king-
posts. At the inner strut location, locate the
pads only on the underside. The plan, Detail
2-I shows each pad required.
Glue the photo-etched copper wing strut
rigging plates (W22) to the pads, aligning
the center hole on the axis of the rib and
beam. A common photo-etched copper fit-
ting is provided in the kit. However, all the
rigging eyes are not needed at every loca-
tion. Cut off the eyes not required. The
plan, Detail 2-J, illustrates what each should
look like. Bend the remaining eyes to the
angle of the wing wires.
On the real aircraft, U bolts going under the
beams are used to hold the plates down. On
the model, glue the fitting to the wings. It
will also be held down when you insert the
struts in the holes.
After the fittings have been installed, or
before, drill a hole into the wing through the
center hole of the fitting for receiving the
wing strut, kingpost, and skid end fittings.
illustrates the installation of
Figure 1-13
pads and fitting.
11. Building and Installing the Upper
Wing Ailerons
Build the ailerons flat on the plan. First, lay
down the leading edge and rod trailing edge,
then pin and glue the ribs to the leading and
trailing edge. Install the stiffening between
ribs. Add the cap strips as you did the wing
panels, then add the copper bands at each
rib. Cut slots in the aileron leading edge and
the rear wing beam web for fake hinges. Use
a strip of brass for the fake hinges. The loca-
tion of the hinges is from factory plans. How-
ever, you could omit all but the two outer
hinges as an option on the model. See
for the basic aileron construction.
1-14
In way of the control horns, add the pads and
filler blocks on each side of the rib and drill a
hole for the fittings. Install the britannia
casting control horns (C1) and the three
back brace wire fittings (R2). See
and plan Details 2-A and 2-D.
12.Installing the Aileron Control
Sheaves
Pin or glue the sheaves (C3) into the sheave
body (C4) to assemble the sheaves. The
sheaves are located on the front beam. Insert
a U pin made from brass rod into the beam
to attach the sheaves to the top and bottom
FIG. 1-13 STRUT SUPPORT PADS & WING WIRE FITTING
PHOTO-ETCHED FITTING W22 –
BEND EYES TO WING WIRE ANGLES.
CUT OFF EYES NOT NEEDED
AT A GIVEN LOCATION.
1/16" X 5/32"
LEADING
COPPER
TAPE
FIG. 1-15 AILERON CONTROL HORNS & BRACE WIRE FITTINGS
Figure
(TOP AND
Figure 1-15
BEAM
CAP STRIP
RIB
FIG. 1-14 BASIC AILERON CONSTRUCTION
1/64" X 1/16" BRASS FLAT BAR FAKE HINGE
.020" X 1/16"
CAP STRIPS
EDGE
TYPICAL 1/32" STIFFENERS
CONTROL HORN CASTING C1
(TOP AND BOTTOM)
.020" PAD
BOTTOM)
FILLER BLOCK
11
DRILL HOLE THROUGH
W22 INTO BEAM
TYPICAL FULL .020" SUPPORT
PAD. (SEE PLAN DETAIL 2-I
FOR PARTIAL PADS)
WEB
BLOCK
CUT SLOT FOR FAKE
HINGES – CUT MATCHING
SLOT IN REAR WING
W14
SELF-ADHESIVE COPPER TAPE
AT EACH RIB
DRILL HOLE TOP AND BOTTOM
FOR CONTROL HORNS
SOLID RIB
W13
BEAM WEB
1/32"-DIA. STEEL
ROD TRAILING
EDGE
PHOTO-ETCHED
BACK BRACE
WIRE FITTING R2