.
c.
Glue the W1a and W1b rib assemblies
to the spars. Be certain to check the
locations carefully. Note in the front view
on plan Plate 1, that 1/4"x I"x5-1/4"
hardwood blocks should fit between the
Wla and W1b ribs, and will rest on the
ledges provided by the W3 ribs.
However, the hardwood blocks cannot
be glued yet. They will be added later
after the basic wing structure is secure.
d.
Glue the remaining ribs to the spars. Sig-Bond glue is recommended.
e.
Fit the shaped trailing edge into the jig ledge on the back of the WI ribs. Trim parts wherever necessary to make the trailing
edge fit snugly against the ribs. Note that the 90 degree angled front corner of the trailing edge is placed up. (See rib
cross-section drawings on the plan.) Check the position of the 1/16"x3/16" cap strips and center section planking on the
ribs in relation to the trailing edge to be certain the trailing edge is positioned correctly on the ribs.
f.
Since there will be minimal gluing contact between the ribs and the trailing edge until the cap strips are installed add
gussets to each rib to secure the trailing edge. Leave the gussets there - they will help to keep the trailing edge from
yielding to the pull of the doped covering when shrinking.
g.
Add the 5/16" sq. top spars. Join in the center of the wing with epoxy.
h.
True-up the fronts of the ribs by sanding
lightly with a long sanding block,
preferably at least 24" long.
i.
Glue the 1/8"x1/2" leading edge to the
front of the ribs.
j.
Trim and sand the top of the leading
edge even with the tops of the ribs.
k.
Glue the 1/16" leading edge top
sheeting in place. Use Sig-Bond glue
and plenty of pins to hold it down
securely until the glue is dry.
l.
Add the remaining 1/16" top sheeting.
m.
Cut out the areas directly above the locations for the nylon wing bolt holes which will be drilled and tapped later.
n.
Add the top 1/16"x3/16" cap strips.
o.
When the glued joints are completely dry, remove the wing from the building
board. Cut off the jig portions of the ribs. Trim or sand the bottom rear comer of
the 3/16"x3/8" rear spar flush with the bottom of the ribs.
p.
Carefully cut away the 3/16"x5/16" bottom spar between ribs Wla and Wlb. Epoxy the 1/4"x1"x5-1/4" hardwood insert
blocks in place between ribs Wla and WIb. The blocks should rest tightly against the ledges provided by the W3 ribs.
