Top Flite Sierra 40 Trainer Kit - Manual (Page 37)

37
2. The tank should be mounted as high in the fuel 1. Accurately mark the balance point on the
tank compartment as is practical. Use foam rubber
to surround the tank on all sides and hold it in
position.
NOTE: There is a fitting on the muffler of most
model engines (especially 2-cycles) known as a
"muffler pressure tap". When the vent line from
yourfuel tank is attached to this fitting, it supplies
the fuel tank with a mild amount of air pressure.
This pressure provides a more consistent flow of
fuel to the carburetor. The result of using this
"muffler pressure tap" is usually an engine that
will run properly whether the plane is climbing,
diving, upside-down, or right-side-up.
3. Route the fuel line from the clunk to the
carburetor fuel intake. Route the fuel line from the
tank vent to the muffler pressure tap, or leave it open
if no pressure tap is available.
NOTE: The fuel system should be completely
free of kinks or leaks. Any of these will cause the
engine to run erratically or not at all.
BALANCE YOUR MODEL
NOTE: This section is VERY important and must
not be omitted! A model that is not properly bal-
anced will be unstable and possibly unflyable.
bottom of the wing on both sides of the fuselage.
The balance point is shown on the plan (CG), and is
located approximately 3-3/4 inches back from the
wing leading edge (1/8" inch back from the center of
the spar). This is the balance point at which your
model should balance foryourfirst flights. Later, you
may wish to experiment by shifting the balance up to
5/16" forward or back to change the flying charac-
teristics. Moving the balance forward may improve
the smoothness and provide arrow-like tracking, but
it may then require more speed for take off and make
it more difficult to slow down for landing. Moving the
balance aft makes the model more agile with a
lighter and snappier "feel." In any case, do not
balance your model outside the recommended
range.
2. With the wing attached to the fuselage, all parts
of the model installed (ready to fly), and an empty
fuel tank, position the model with the stabilizer level.
3. Lift the model at the CG marks. If the tail
drops when you lift, the model is "tail heavy" and you
must add weight* to the nose for balance. If the nose
drops, it is "nose heavy" and you must add weight*
to the tail for balance. NOTE: Nose weight may be
easily installed by sticking strips of lead into the
engine compartment beside the engine. Tail weight
may be added by using "stick-on" lead weights,
available from your hobby dealer.
*lf possible, first attempt to balance the model by
changing the position of the receiver and battery. If
you are unable to obtain good balance by doing so,
then it will be necessary to add weight to the nose
or tail to achieve the proper balance point.
FINAL CHECKS
proper direction as illustrated in the following
sketches.
RADIO SET-UP
FOUR CHANNEL AIRCRAFT
Transmitter
Stick Movement
Control Surface
Movement
Elevator moves up
Right aileron moves
UP and Left aileron
moves DOWN
Rudder moves LEFT
Carburetor wide open
See the following page for 3 channel set up.
2. Adjust your pushrod hookups as necessary to
provide the proper control surface movements as
listed on page 34. Make sure all of the clevises are
securely "snapped" together.
*NOTE: These control surface "throws" are
approximate and provide a good starting point
for the first flights with your Sierra. You may wish
to change the throws slightly to provide the
smoothness or quickness that you prefer.
1. Make sure the control surfaces move in the