SIG Four-Star 120, Инструкция по сборке и управлению, Страница: 14 / 30

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43. a. Install the landing gear mount to the fuselage by gluing it firmly to the sides, the doublers, and the bottom of F-2.
b. Bevel the bottom edge of F-1 as necessary to allow FBF (Fuselage Bottom, Front) to seat properly in its grooves on
the bottom of the fuselage.
c. Tape FBF in place, then glue it using medium CA. Be sure to firmly glue the joint between FBF and the landing gear
mount from inside the fuselage.
NOTE: The hole in FBF is provided to serve as an oil drain hole, as well as a convenient place to route the vent line from
the fuel tank and/or the breather line from the crankcase of a four-stroke engine.
44.
a. If the tank floor was installed earlier for alignment reasons, remove it now.
Cut two 1-3/8" lengths from the 3/4"x30" balsa triangle stock to serve as
braces for the landing gear mount. Notch both braces to clear the blind
nuts, then glue them in place.
b. Cut two braces for F-1 from the 3/4" balsa triangle stock and notch them as
necessary to clear the blind nuts on the back of F-1. Apply slow CA to the
braces and press them firmly in place.
45.
a. Now you can permanently install the tank floor. Make sure it is seated on the fuselage doublers and against the back
of F-1, then glue it in place.
b. Trim the die-cut lite-ply nose triplers as necessary to fit, then glue them firmly to the fuselage doublers and F-1.
c. Glue the small top deck formers T-1 , T-2, and T-3 into their notches in FT.
46.
a. Bevel the top edge of the fuselage sides with a sanding block to provide a firm seat for the fuselage top deck when it
is installed. Notice that the angle between the top deck and the fuselage sides varies along the entire length. Use the
top deck formers as a guide to the sanding angle. Don't worry about perfection - a few swipes with a sanding block
on each side should do the trick.
b. Tape the die-cut balsa top deck in place. You will probably need to apply some warm water to the upper surface of
the top deck to make it easier to bend into position and prevent it from cracking. Apply medium CA from inside the
fuselage as much as possible. When dry, remove the tape.
47.
Check the fuselage for joints that could use another application of medium or slow CA. Fill any gaps at the Tee-Lock tabs
and slots with CA.
The fuselage should now be ready for final sanding. Sand off all of the Tee-Lock tabs, then round the bottom edges of the
fuselage and the corners of the balsa top deck. Use a sanding block, starting with 80-grit sandpaper. Switch to 150-grit,
then 220-grit or 360-grit for the final sanding.