
.
WING CONSTRUCTION
Left Inboard Panel
28.
a. Begin by pinning in place the 5/16"x1-1/4"x26" notched balsa trailing edge over the plans.
NOTE: Make sure that you identify the correct trailing edge for each of the four wing panels, the notch spacing is
different for each.
b. Pin in place the 3/16"x3/8"x25" bottom spruce spar, making sure you leave a small amount of excess on each end of
the wing panel.
NOTE: Use two W-2 ribs to position the spar the proper distance from the trailing edge.
c. Cut pieces of 1/16"x3" balsa, from the 36" long pieces provided, for the bottom center section sheeting that goes
between the rear of the spruce spar and the trailing edge. Glue and pin in place.
29.
Glue and pin all ribs in place except for the two ribs at the ends of the panel (W1A at the dihedral joint and the last W2 rib at
the polyhedral joint).
30.
Carefully glue the die-cut lite-ply rib W1A in place, using the dihedral guage to position the rib at the proper angle.
NOTE: The dihedral and polyhedral guages called for in these instructions are provided on the 1/16" die-cut plywood sheet.
31.
Glue and pin in place balsa rib W2 at the polyhedral joint, using the polyhedral guage to position the rib at the proper angle.
32.
Glue and pin in place the top 3/16"x3/8"x26" spruce spar, again leaving a small amount of excess on each end of the wing
panel. Recheck the end ribs W1A and W-2 with the dihedral and polyhedral guages to insure that the ribs haven't moved.
33.
Glue in place the 1/4" dia. x26" birch dowel leading edge and the two top 1/8"x3/16"x26" spruce turbulators. When dry,
remove the wing from the board and add the bottom turbulator spar.
34.
Cut off the leading edge, trailing edge,
spruce spars and turbulators with a razor
saw so they are flush with end ribs.
Set this left wing panel aside for now
and repeat steps 28 through 34 to build
the right inboard wing panel, so that you
will have one left wing panel and one
right wing panel.
ABOUT TRAILING EDGE RIB
NOTCHES
The rib notches may vary slightly in
position on the plan because, as
noted, the plan paper is subject to
shrinking or stretching with humidity
changes. Enlarge sny notches that
ern't deep enough or wide enough with
a razor blade and align the rib so that
it is parallel to the plan.