.
93.
a. Tape or pin the wing to the fuselage, making sure that it is in perfect alignment. Carefully and accurately mark the
position of the wing hold-down bolts on the bottom surface of the wing. Visually confirm that a hole drilled at the
marks will pass through the approximate center of the wing mounting blocks.
b. Drill through the wing and the wing mounting blocks at the same time with a #7 (or 13/64") drill bit. Keep the drill
perpendicular to the bottom surface of the wing so the heads of the nylon bolts will seat flush against the wing.
c. Remove the wing and tap the wing mounting blocks with a 1/4-20 tap. You can apply a few drops of thin C/A to the
holes to strengthen the threads.
d. Redrill the holes in the wing with a 1/4" drill bit to pass the nylon wing bolts.
Completing The Fuselage
94.
a. With the wing bolted in place, glue F-6A to the fuselage, just behind the
trailing edge. You will have to cut away a small portion of the fill strips to
make room for F-6A.
b. Cut and shape the bottom stringer from a piece of 1/8"x3/8"x36" spruce.
Glue the stringer along the center of the fuselage bottom with its front end
against the backside of F-6A.
c. Trim the die-cut lite-ply PB-2 reinforcements to fit between the bottom
stringer and the 1/8"x1/4" balsa fill strips. The outer ends of the
reinforcements should rest on the bottom edge of PS-2. Sand the wing
trailing edge and fuselage bottom for a good match to each other.
95.
a. Mark the positions of the side stringers on the fuselage main frames. Cut
and shape the side stringers from 1/8"x3/8"x36" spruce, then glue them in
place on the fuselage.
b. Use a sanding block with one end covered with heavy paper to sand the fill
strips to the shape shown in the fuselage cross sections (Plates 1 and 2).
The paper protects the spruce stringers from being taken down while
sanding the fill strips. Use the same technique to sand the fill strips on the
front fuselage section, including FS-1 and FS-2. Complete the shaping by
sanding the corners round on the fuselage bottom.
BUILDER'S TIP:
While there is still easy access through the bottom, now is the time to install the
fuel tank, throttle pushrod, etc. The fuel tank should be mounted with its'
centerline even with or slightly below the centerline of the engine's carburetor.
Materials for mounting the tank are not furnished specifically, but there should
be plenty of scrap that can be used. The tank supports should hold the tank in
its proper position but should also allow it to be pulled out easily if necessary.
See "TIPS ON TANKS" , and "THROTTLE HOOKUP".
NOTE: The wing center section, completed through Step 40 is required for the
following instruction.
96.
a. Glue together the two 3/8"x4"x4-1/2" balsa bottom sheets to form a piece that is 8"x4-1/2".
b. With the wing bolted to the fuselage, use a sanding block to bevel the back edge of the bottom sheet so that it sits
flush against the landing gear mount in the wing leading edge. When satisfied glue the bottom sheet to the fuselage.
c. When dry, sand the bottom sheet to the contours shown in the "Cross Section at F-l" and "Cross Section at F-2"
drawings (Plate 1). The bottom sheeting should now blend smoothly into the landing gear mount.
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