Model Shipways 28 - Manual (Page 10)

10 10
The upper wing is built in two separate sections that will be joined later at the air-
craft’s center line. Refer to Figures 2/1 through 2/15 for the number and location of
the parts. Ribs are numbered out from the centerline. The following procedures will
need to be repeated for the right and left upper wings.
PARTS LIST FOR STAGE 2:
Ni28-001 Ribs #1 4 laser-cut wood parts 3/64 thick
Ni28-002 Ribs #2 2 laser-cut wood parts 3/64 thick
Ni28-003 Ribs #3-10, 12 18 laser-cut wood parts 3/64 thick
Ni28-004 Ribs #11 2 laser-cut wood parts 3/64 thick
Ni28-005 Ribs #13 2 laser-cut wood parts 3/64 thick
Ni28-006 Ribs #14 2 laser-cut wood parts 3/64 thick
Ni28-007 Ribs #15 2 laser-cut wood parts 3/64 thick
Ni28-008 False ribs #A 2 laser-cut wood parts 3/64 thick
Ni28-009 False ribs #B 2 laser-cut wood parts 3/64thick
Ni28-017 Nose ribs 30 laser-cut wood parts 3/64 thick
Ni28-018 Compression bar 4 Britannia metal
Ni28-020 Joint pin plates 4 Britannia metal
WP3688-24 Rib caps .02 x 5/64 wood strips
WP3688-24 Leading edge cover 7 .02 x 5/64 wood strips
WP3631-24 Front and rear spars 4 1/8 x 1/8 wood strips
WP3640-24 Leading edge 2 3/16 x 3/16 wood strips
WP3620-24 Trailing edge 2 1/16 x 1/8 wood strips
WP3202-40 Wing tips (laminated) 5 .02 x 5/32 Tanganyika wood strips
WP3202-40 Center trailing edge
(laminated) 5 .02 x 5/32 Tanganyika wood strips
WP5101-24 Joint pins 2 1/8 x 1/4 wood dowels
W042 Turnbuckles 28 Britannia castings
WP1205 Rigging cable 7” Metal-gray thread
J002 R-L Upper wing tips jigs 2 laser-cut wood parts 5/32 thick
J003 Upper center
trailing edge jig
1 laser-cut wood part 5/32 thick
Wing ribs; cap strips:
Begin by laminating two parts Ni28-001 to form each Rib #1. Take the required
lengths of the rib cap strips(WP3688-24) from full-size Plan D02. (Note that the rib
cross sectional drawings are double size and reduce your measurements accordingly if
you refer to these.) The rib cap strip edges will be flush with the sides of laminated
ribs #1, but they must overlap the other ribs equally to each side. The easiest way to
accomplish this is to pin each rib on its side, through the lightening holes, then slip a
couple of pieces of .02î thickness wood strip between the rib and the assembly board.
This will automatically set the required overlap when you glue on the cap strips. Hold
the cap strips in place with pins while the glue dries.
Inserting the spars; leading edges; trailing edges:
Using full-size Plan D02, cut the front and rear spars(WP3631-24) to the required
lengths. Carefully taper them from where they pass through rib #12 out toward the
wing tip where the cross section should be reduced to 5/64 x 5/64. This should be done
evenly from all four sides.
Next, adjust the spar holes in the ribs so the spars slip through without binding. Pin
the assembly down, making sure everything is square, and glue the spars in place.
Finally, cut the leading(WP3640-24) and trailing(WP3620-24) edges to size and glue
them in place against the ribs.
After the glue dries thoroughly, unpin the structure. Using a long strip of sandpaper,
about 11”, affixed to the same length
straight piece of wood, sand the leading
and trailing edges to the correct cross sec-
tion. This technique will ensure a uniform
shape.
Wing tips and center trailing edges;
false ribs:
Here is where you will likely be expand-
ing your skills, actually making shaped
plywood by bending and gluing wood
strips around a form. The procedure is the
same for all four parts. Secure jigs J002
and J003 to a paper covered board.
Referring to Plan D02 and Figures 2/7 and
2/8, cut five lengths of Tanganyika wood
strips(WP3202-40) for each wing tip.
Bend and glue the strips as described
above, pinning the sandwich against a jig
to establish the correct shape as the glue
dries.
Remove the wing tips and center trailing
edges from the jigs and shape them as
necessary for installation on the wings.
Note that Plan D02 shows mitered, not
butt, joints where the wing tips are glued
in place. This provides greater strength to
the glue joint. Glue the false ribs(Ni28-
008, Ni28-009) in place.
Nose ribs; leading edge cover:
Using Plan D02 as a guide, glue the
nose ribs(Ni28-017) in place. After the
glue is dry, a light sanding, if needed, with
the sanding paddle will ensure both ribs
and nose ribs perfectly line up on the
upper wing surface.
Glue the eight strips of the leading edge
cover(WP3688-24) in place, proceeding
from the leading edge toward the forward
spar. After the glue is dry, sand the ends to
conform to the wing’s shape and sand the
cover to a smooth surface. [The kit sim-
plifies the rear edge of the leading edge
cover by leaving it straight across. In the
actual aircraft, this was shaped into a for-
ward, flattened arc between each pair of
ribs, for an overall scalloped effect. If the
advanced modeler wants to make this
modification, be careful that the arcs have
a uniform amplitude.]
Compression bars; rigging:
Referring to Figure 2/10 and Plan D02,
use a bent pin, working in from both
sides, to carefully bore 0.5mm(.020î)
holes through ribs #1, 4, 6, 8, 13 and 15
for the rigging(WP1205) to pass through
against the spars.
Precisely align the compression
bars(Ni28-018) and glue them in place.
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