Stage 2 Building the Upper Wing | Model Shipways 28 manual

Stage 2: Building the Upper Wing

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.