Model Shipways 28 - Manual (Page 13)

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Next, tie turnbuckles(W042) where indicated to the compression
bars and to the holes in ribs #6 and #15. You will use 14 turn-
buckles for each half of the upper wing. Begin each run of the rig-
ging line by tying one end to a turnbuckle and permanently affix-
ing it with a drop of super glue. Run the line through the holes as
indicated, ending through the second turnbuckle. Affix a small
weight on the line to keep it taut (Fig. 2/13-D) and seize thread
around the line at that point. Apply a drop of super glue there and
at each place the line passes through a rib. Cut off the excess line
and repeat the procedure until all of these alignment lines are in
place. Note that the lines connect directly to rib #1, without a
turnbuckle.
Joining the wing halves:
This step requires patience in order to get the correct 1.5
degrees dihedral when joining the upper wing halves and a little
extra care to avoid making your fingers part of the assembly.
Begin by taping a 5mm high riser block, cut from spare wood
strips, to rib #12 on each wing half. [Note that this varies slight-
ly from Fig. 2/15.] Next, insert the two joint pins (WP5101-24)
through ribs #1. There should be just enough play so that, with
the top of ribs #1 touching, the center of the assembled wing can
sag to the table top. Super glue the topside contact edges togeth-
er.
When the glue is hard, carefully turn the assembly over and run
a drop of super glue into the gap to lock the joint pins in place and
to strengthen the joint. Finally, shape a shim to fit the
gap(Fig.2/14), without prying it apart, and glue this in place with
white or yellow glue. After everything is dry, finish off the wing
by sanding the joint as needed and affixing the four joint
plates(Ni28-020).
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The lower wing will also be constructed in right and left halves,
but there will be no dihedral when they are attached to the fuse-
lage. The ailerons are built integral to the wing structure and will
then be cut free to operate. This ensures that it all lines up per-
fectly. Refer to Figures 3/1 through 3/10 for the number and loca-
tion of the parts. As before, ribs are numbered out from the cen-
terline. The following procedures will need to be repeated for the
right and left lower wings.
PARTS LIST FOR STAGE 3:
WP3688-24 Rib caps .02 x 5/64 wood strips
Ni28-021 Ribs #1 4 laser-cut wood parts 3/64 thick
Ni28-022 Ribs #2 2 laser-cut wood parts 3/64 thick
Ni28-023 Ribs #3, 5 4 laser-cut wood parts 3/64 thick
Ni28-024 Ribs #4, 6 4 laser-cut wood parts 3/64 thick
Ni28-025 Ribs #7, 8, 10, 11 8 laser-cut wood parts 3/64 thick
Ni28-026
Ribs #9 2 laser-cut wood parts 3/64 thick
Ni28-027 Ribs #12 2 laser-cut wood parts 3/64 thick
Ni28-028 Ribs #13 2 laser-cut wood parts 3/64 thick
Ni28-029 Ribs #14 -
ailerons only
2 laser-cut wood parts 3/64 thick
WP3626-24 Front and rear spars 2 3/32 x 1/8 wood strips
WP3202-40 Wing tips
(laminated) 5 .02 x 5/32 Tanganyika wood strips
WP3202-40 Center trailing
edges (lam.) 5 .02 x 5/32 Tanganyika 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
WP3688-24 Leading edge cover 5 .02 x 5/64 wood strips
WP40264 Aileron torque bars 2 5/64 x 9 1/4 brass rod
Ni28-033 Aileron hinges 6 Britannia castings
Ni28-034 Lower wing joint 1 Britannia casting
Ni28-018 Compression bars 2 Britannia casting
W042 Turnbuckles 16 Britannia castings
WP1205 Rigging cable 7’ Metal-gray thread
J004 R-L Lower wing tip
jigs
1 laser-cut wood part 5/32 thick
J005 R-L Lower center
trailing edge jigs 1 laser-cut wood part 5/32 thick
Wing ribs; cap strips:
Prepare the lower wing ribs(Ni28-021-029) and cap
strips(WP3688-24) exactly the way you did for the upper wing.
Begin by laminating two parts Ni28-021 to form each rib #1. Take
the required lengths of the cap strips from full-size Plan D02.
Wing tips and center trailing edges:
The technique is the same as for the likewise laminated parts for
the upper wing, using five Tanganyika wood strips(WP3202-40).
In this case, use jigs J004 and J005 and refer to Plan D02. As
before, shape the laminated parts as necessary for installation on
the wings.
Inserting the spars; leading and trailing edges; aileron torque
bars; aileron hinges:
Referring to full-size Plan D02, cut the front and rear spars
(WP3626-24) to length and shape them as required. Adjust the
spar holes in the ribs so the spar slips through without binding,
then cut and insert the aileron torque bar(WP40264), adding rib
#14 between ribs #6 and 7, and the hinges(Ni28-033) between
ribs #7 and 8, #9 and 10, and #12 and 13. These should turn freely
on the torque bar. The leading edge, spars and torque bar will pro-
trude through rib #1. Pin the assembly down, making sure every-
thing is square, then glue the spars in place.
The torque bar should be glued only to ribs #7-14 and be able to
turn without binding in the other ribs. Do not glue the hinges to
the rear spar. This will be done after the aileron is cut free from
the wing and sanded to its final shape.
Finally, cut the leading (WP3640-24)and trailing(WP3620-24)
edges to size and glue them in place against the ribs, then add the
laminated wing tips and center trailing edge as for the upper wing.
After the glue dries thoroughly, unpin the structure. Using a long
strip of sandpaper (about 11”) affixed to the same length straight
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