Installing The Wing Tips, Trailing Edge, And Upper Beam Flanges; Installing The Small Wing Stringers - Model Airways CURTISS JN-4D JENNY Instruction Manual

The web blocks to be described in
Option:
the next paragraph can be glued to the beam
webs before the beam webs are glued
between the ribs.
At each compression
Installing web blocks:
rib, add the web blocks on each side of the
ribs. Fit these blocks on the forward side of
the rear beam and aft side of the front beam.
These blocks hold the drag wire single eye rig
fittings (R1). The fittings should be installed
in the blocks before installing the block; easier
now than later. illustrates.
Figure 1-5
At the compression ribs where the wing
struts are located, add additional blocks on
the other side of the beam webs. The blocks,
now on all four corners of the rib juncture
provide support for the pads in way of the
wing struts
5. Installing the Wing Tips, (Figure 1-6).
Trailing Edge, and Upper Beam
Flanges
The wing tips are made of wood. The rear
beam flange tapers aft, and its web tapers top
and bottom to the tip. The front beam flange
tapers forward, and its web tapers top and
bottom. See Detail 2-F and 2-G on the plan for
the correct tapers. There is a filler block at the
leading edge. It tapers like the front beam.
Outboard of the last full-size rib there is a nar-
row wing rib. Taper and fit the wing tips. On
the lower wing, the tip curves into the trailing
edge. Heat bend this curve. Note that the wing
tip follows the curvature of the undercam-
bered wing ribs, so it is not a straight piece.
illustrates the wing tip construc-
Figure 1-7
tion, with the exception that the upper beam
flanges and stringer have not yet been added.
The trailing edge is a steel rod. It is tied into
the wooden wing tips of the lower wings.
Bend the trailing edge to shape. Splice the
steel trailing edge into the wooden lower
wing tip and wrap with thread. For the upper
wing, the ailerons have the rod. Position and
glue the trailing edge to the ends of the ribs
with just a touch of super glue
After the wings are removed from the build-
ing board, and the cap strips have been
added, the copper self stick bands will be
added at each rib over the trailing edge rod.
The lower wings have a handhold block
(W23). Install the laser-cut blocks and sand
to the taper of the wing tips and round the
hole edges. See and Detail 2-H
Figure 1-9
on the plan.
Installing the upper flanges:
and web blocks and the wing tips are in
place, add the beam upper flanges. Flanges
are tapered at the wing tips. See Detail 2-F
and 2-G on the plan.

6. Installing the Small Wing Stringers

The stringers on the real aircraft are very
small dowels (about 5/16" full-size). However,
1/32" square strips are provided in the kit, as
a dowel this small is not available commer-
cially. You can sand the edges of the square
to form a dowel or use a draw plate. Or, leave
the square strips as is for more strength (rec-
SINGLE DRAG
WIRE FITTING
R1 THIS SIDE
RIGHT WING, REAR BEAM
FITTINGS REVERSE SIDES.
DRILL HOLES FOR R1
.
(Figure 1-8)
FILLER BLOCK
HANDHOLD
BLOCK HERE
(SEE FIG. 1-9)
After all webs
DOWNWARD
CURVE SIMILAR
TO CAMBER OF
WING RIB W11
1/16" X 3/32" WING TIP
TAPERED AND SHAPED
FIG. 1-5 WEB BLOCKS AT COMPRESSION RIBS
BLOCKS SHOWN. FRONT
BEAM SIMILAR EXCEPT
SINGLE AND DOUBLE R1
(SEE PLAN OF WINGS)
DRAG WIRE
FITTINGS R1
FIG. 1-6 WEB BLOCKS AT WING STRUTS
PLAN
FIG. 1-7 WING TIP CONSTRUCTION
BLOCK
TRAILING EDGE ROD (SEE FIG. 1-8)
9
WING RIB W4 OR W6
BEAM WEB
WEB BLOCK –
1/32" THICK AT FRONT BEAM
3/64" THICK AT REAR BEAM
ADD WEB BLOCKS ON OPPOSITE
SIDE OF WEBS IN WAY OF WING
STRUT LOCATIONS
WEB BLOCKS
PER FIG. 1-5
TYPICAL 3/64" X 3/64" STIFFENER.
AT WING TIP, USE COPPER
STICK TAPE AS SHOWN
STRINGERS
W4
W11
WEB
TAPERED
FLANGE
(SEE PLAN
DETAILS)
THIS WEB SAME
THICKNESS AND
TAPER AS FLANGES
LOWER WING SHOWN
(UPPER WING SIMILAR EXCEPT
FOR CUT OUT FOR AILERONS)
BEAM LOWER
FLANGE
TAPE