FINISHING
ADDITIONAL FUELPROOFING
If you have not already done so, make sure the entire
engine compartment is completely fuelproof. Also fuelproof
any wood that will not be covered and which may be exposed
to glow fuel residue. Use epoxy thinned with alcohol,
polyester finishing resin or fuelproof paint.
air flow. While fitting, if you notice that the cowl is a very
tight fit over the fuselage, you may sand all around the front
of the fuse until the cowl goes on easily.
BALANCE THE AIRPLANE LATERALLY
D 4. Trim the base of the cowl so it overlaps the fuselage
approximately 1/4" on the right side and 7/16" on the left side.
D 5. Attach the cowl to the fuse with four or five #2 x
3/8" sheet metal screws. PLAN AHEAD!: Locate the
screws 1/8" behind the front edge of F-l, so they go into the
center of F-l.
D 6. Reinforce the cowl screw hole locations by gluing
1/2" x 1/2" patches of lightweight fiberglass cloth to the
inside of the cowl at the screw locations.
D 7. Sand the entire outside surface of the cowl lightly
with 320-grit sandpaper.
D 8. Spray on a coat of K&B white primer, then sand
smooth.
SPECIAL NOTE: Do not confuse this procedure
with "checking the C.G." or "balancing the airplane
fore and aft". That very important step will be
covered later in the manual.
Now that you have the basic airframe nearly completed,
this is a good time to balance the airplane laterally (side-to-
side). Here is how to do it:
D 1. Temporarily attach the wing and engine (with muf-
fler) to the fuselage.
D 2. With the wing level, lift the model by the engine pro-
peller shaft and the bottom of the rudder (this may require two
people). Do this several times.
D 3. If one wing always drops when you lift, it means that
side is heavy. Balance the airplane by gluing weight to the
other wing tip. NOTE: An airplane that has been laterally
balanced will track better in loops and other maneuvers.
D 9. Paint the cowl with red fuelproof paint, mixed to
match your covering material. Monokote varies slightly in
color from roll to roll, but the following is a formula that will
produce a very close match to #201 Red Monokote. This mix
is intended for spraying. We recommend that you spray a
scrap of white ABS plastic, allow it to dry. compare it with
your covering material, and adjust the proportions as neces-
sary. The paint will appear too orange when first applied, but
will darken as it dries. This recipe will provide enough paint
for one light mist coat and two full coats.
lOcc K&B Superpoxy Red #8103
5cc K&B Superpoxy Orange #8102
15cc K&B Superpoxy Gloss Catalyst #8129
30cc K&B Superpoxy Thinner
D 10. Trim the cowl with striping tape and the decals
provided (see instructions later in this book).
FINAL SANDING
Check over the entire structure carefully, inspecting for
any poorly glued joints, gaps and "dings". Apply additional
glue and/or balsa filler as necessary, then sand the entire
structure smooth using progressively finer grades of sandpa-
per.
COVERING
Because it is assumed that you have had some previous
model building experience, we won't go into detail in regard
to the covering procedure. Follow the instructions included
with your covering material.
33
Summary of Contents for Super Decathlon 40
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