Installing The Lower Wings; Installing The Interplane Wing Struts And Upper Wings - Model Airways CURTISS JN-4D JENNY Instruction Manual

this point, so it is best to install the fore and aft
brace wires. The had several arrange-
Jenny
ments for the strut wiring. The one we select-
ed is most common. First, rig the forward
cross wires from the top of the struts across
the fuselage to the R1 fitting on the inside top
of Station 3 struts. Turnbuckles (R3A, short)
are at the top. These wires act as sort of a com-
bined cross brace wire and drag wire, since
they are angled forward.
The aft drag wires do not cross and are quite
unusual. With turnbuckles (R3A, short) at
top, feed the wires inside the rear cockpit
against the cockpit rubber edging and seize
to the rigging eye used for the side cross
brace wires at Station 7. On the inside of the
cockpit, the wires are covered with a padded
or rubber block attached to the longeron.
Add these blocks; you could paint them
brown to look like pads. The center section
drag wires are shown on
Figure 7-7
Some fed the wires through
Note: Jenny's
holes in the cowl and seized the wire at the
lower clip at Station 6.

5. Installing the Lower Wings

Double check the fuselage to make sure it is
secure and sitting square. This is important,
since the wings will be set by blocks meas-
ured above the working surface.
Insert the lower wings steel fake hinge pins in
the fuselage holes at Stations 4 and 5. Place a
temporary 3/32"-thick wood strip at each end
of the wing to gauge the gap between the
fuselage and wing. This gap is where the
actual hinge pin is located on the real aircraft,
so the outer wing panels do not actually
touch the center wing section or fuselage.
However, if you have already added a spacer
on the fake hinge pins as shown on the plans,
the temporary spacer is unnecessary. Tem-
porarily block up the ends of the lower wings.
Shape two other wood blocks to the wing
angle next to the fuselage. Move the blocks out
near the wing tips just beyond the outer wing
strut locations, and shim them up until you
have the correct dihedral angle for the wings.
The dihedral is only 1 degree. At the outer
wing strut the wing is about 3/16" higher than
at the fuselage. Make the blocks long enough
to install some nails or eyebolts in top, for
attaching a rubber band to hold the wings to
the block. Glue or nail the block to the board.
Check that the leading edge of the right and
left wing panels are perpendicular to the fuse-
lage and are in a straight line. You don't want
any sweep back or up with the wings. When
all is correct and secured to the blocks, glue
the fake hinge pins in the fuselage.
Make sure the lower wings are rigidly held
down before attempting to install the upper
wing panels. You don't want anything moving.
See for lower wing installation.
6. Installing the Interplane Wing
Figure 7-8
Struts and Upper Wings
First, fit the interplane struts into the lower
wing holes through the W22 fittings at the
FIG. 7-6 INSTALLING THE UPPER WING CENTER SECTION
COMPLETED
STRUTS
.010" GRAY CORD
.
R3A SHORT
TURNBUCKLES
R1 FITTING INSIDE
AT STATION 3
(SEE DETAIL 3-0
ON PLAN SHEET 3)
FIG. 7-9 INSTALLING INTERPLANE STRUTS & UPPER WING PANELS
HINGE PIN DETAIL IDENTICAL
STATION 4
FIG. 7-7 CENTER WING SECTION BRACE WIRES
PADDED BLOCK, OR PAINTED
W22 FITTINGS
WOOD BLOCK ON MODEL –
PROTECTS PILOT
FROM WIRE
FIG. 7-8 INSTALLING LOWER WINGS
HINGE PIN HOLES
AT STATIONS 4 AND 5
3/32" SPACER
FAKE WING HINGE
ROD
MAKE SURE ALL W22 FITTINGS
TO LOWER WING
(SEE FIG. 7-8)
35
COMPLETED CENTER SECTION
W22 FITTINGS UNDER
CENTER SECTION
STRUT
F20 FITTING
ON FUSELAGE
STATION 5
FIX CORD TO
EXISTING BRACE
WIRE FITTING
ON FUSELAGE,
OR ADD A
SEPARATE R1 EYE
RUBBER BAND OR
OTHER HOLDDOWN
1° DIHEDRAL
BLOCK
WING SKID
GLUE OR NAIL
ARE IN PLACE ON WINGS
BEFORE INSTALLING STRUTS
PREVIOUSLY
COMPLETED
INTERPLANE STRUTS
STATION 7
SHIMS