Great Planes Ultra Sport 40 Kit - GPMA0410 - Manual (Page 40)

ties. In any case, do not balance your model outside
the recommended range.
2. With the wing attached to the fuselage, all parts
2. Adjust your pushrod hookups as necessary to
provide the proper control surface movements as listed
on Page 36.
of the model installed (ready to fly), and an empty fuel
tank, block up the tail as necessary to level the fuselage.
(If you have built a tricycle gear, the fuse should already
be sitting level).
3. Lift the model at the CG marks. If the tail drops
*NOTE: These control surface "throws" are
approximate and provide a good starting point for
the first flights with your Ultra Sport 40. You may
wish to change the throws slightly to provide the
smoothness or quickness that you prefer.
when you lift, the model is "tail heavy" and you must
add weight to the nose to balance. If the nose drops, it is
"nose heavy" and you must add weight to the tail to
balance. NOTE: Nose weight may be easily installed by
using a Prather "Spinner Weight" (available in assorted
weights, up to 2 ounces), or by gluing strips of lead into
the engine compartment under the engine. Tail weight
may be added by using Prather "stick-on" lead weights,
and, later, if the balance proves to be OK you can open
the fuse bottom and glue these in permanently.
FINAL HOOKUPS AND CHECKS
proper direction as illustrated in the following sketches:
CARBURETOR WIDE OPEH
RUDDER MOVES RIGHT
NOSE WHEEL TURNS RIGHT
RIGHT AILERON MOVES UP
LEFT AILERON MOVES DOWN
ELEVATOR MOVES UP
FOUR-CHANNEL SETUP
TRANSMITTER
STICK MOVEMENTS
CONTROL SURFACE
MOVEMENTS
3. Check for wing twist as follows:
NOTE: Even if you have built your wing on a
perfectly flat surface and used utmost care, it is
possible that your wing may have a twist due to
uneven shrinking of the covering material. You
must check for this condition and correct it
before the first night.
If you do not own a wing incidence meter, we
recommend that you purchase one from yourlocal hobby
dealer or borrow one from another modeler. With the
wing mounted to the fuselage, use the incidence meter to
check the angle of your wing at the root and at the tips.
If the incidence meter reveals a wing twist of more than
1/4 degree, you must grasp the wing at the root (center)
and at the tip and twist it slightly, while reheating the
covering material. Keep checking, twisting and re-
heating until the wing twist is removed. NOTE: If you
have corrected a wing twist by this method, you should
periodically re-check to make sure the correction has
held.
PRE.FLIGHT
CHARGE THE BATTERIES
Follow the battery charging procedures in your radio
instruction manual. You should always charge your
transmitter and receiver batteries the night before you go
flying, and at other times as recommended by the radio
manufacturer.
FIND A SAFE PLACE TO FLY
The best place to fly your R/C model is an AMA
1. Make sure the control surfaces move in the
40