spacewalker SIGRC61, Building And Flying Instructions

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Wing Subassemblies
Before beginning construction on the wing, there are a number of subassemblies that should be built and set aside until
needed. This is done to avoid interruptions during the flow of the wing construction.
1.
The main wing spars are laminated from 1/8"x3/4" spruce sticks as shown in the "Main Spar Assembly Diagram" on the
plans (Plate 3). Build four main spars using a thin film of slow-drying epoxy to join each laminate. It is very important that
the main spar assemblies be kept perfectly straight while drying. Any 'bends or twists built in now are there to stay!
2.
Join two die-cut 1/8" lite-ply W-IA sub-ribs to two W-l wing ribs, being certain to make one left and one right. These
subassemblies will serve as the two center ribs in the wing center section. The remaining two W-IA sub-ribs are not
installed until the wing has been fitted to the fuselage.
3.
Use scrap pieces of 1/16" balsa to join together two W-2 wing ribs. Make two of these subassemblies. These are the two
ribs that will meet at the wing joint when the outer panel slides in place. The 1/16" balsa scraps serve as temporary spacers
that hold the ribs in perfect alignment. After construction, the spacers are cut away, so locate them around the edges where
it will be easy to get at them.
4.
a. Again, use scrap pieces of 1/16" balsa to join two W-4A sub-ribs to two W-3 wing ribs, being certain to make one left-
hand and one righthand. These subassemblies are used at the inboard ends of the ailerons.
b. Use scrap pieces of 1/16" balsa to join W-4A sub-ribs to two W-4 wing ribs. Make one left-hand and one right-hand.
These subassemblies are used at the outboard ends of each aileron.
5.
Prepare the aluminum
wing joiner channels
and wing joiner spars
as shown in the
diagrams below.
Carefully cut out the
templates and
accurately position
them on the backs of
the aluminum joiner
channels. Use a punch
to mark the channels
at the center of each hole. Remove the templates, and drill carefully and slowly at the punch marks. Drill all holes with #33
drill bit and use a drill press if at all possible.