GREAT PLANES SU-31 Instruction Manual page 14

o
2. Test fit the motor mount box together. The pieces are
labeled and the motor mount is correspondingly marked.
When the motor mount box is correctly assembled it should
have right thrust and the four holes the blind nuts have been
installed in should be slightly offset to the left. If using the
recommended RimFire .10 (35-30-1250) brushless out-
runner motor, it is best to use the motor mounting position
that is farthest forward, as shown in the photo.
o
3. Test fit the assembled motor mount onto the front of the
airplane. Once certain that the motor mount is assembled
correctly, epoxy the motor mount together using 30-minute
epoxy. Use some clamps or wrap tape around the motor
mount to hold it in position. While the glue is still curing,
epoxy the motor mount to the front of the airplane. Use some
tape or clamps to hold it in position while the glue cures.
Note: It may be helpful to stand the airplane on its nose
while the glue cures.
o
4. Once the epoxy has had plenty of time to cure, remove
the tape and install the motor using the "X" shaped mount
provided with the motor. Secure the motor to the motor mount
with four 3 x 8mm machine screws and 3mm washers. Do
not forget to use threadlocking compound when installing
the "X" mount to the motor and when installing the motor to
the airplane.
o
5. Connect the motor leads on the ESC to the motor. This
is a good time to confirm that the motor will rotate the correct
direction (use your radio system to test the motor operation).
If the motor is rotating the wrong direction, disconnect any
two of the three motor leads and swap their position. Using
some double-sided foam tape, mount the ESC to the side of
the motor box, as shown. A thin coating of epoxy will improve
the adhesion of the double-sided foam tape. Allow the epoxy
to fully cure before applying the tape.
o
6. Connect the servo leads and ESC to the receiver.
Depending on where you mount the receiver, you may need to
add a 6" [152mm] servo extension to the ESC lead. If you are
using a 4-channel receiver, you will need a dual servo extension
or Y-harness for the aileron servos. Cut a piece of double-sided
servo tape to secure the receiver inside the fuselage.
o
7. If using a 2.4 GHz receiver, tape the antennas to the
inside of the fuselage. If using a 72 MHz receiver, make
a small hole in the fuselage, just under the wing. Run the
antenna out of the hole and tape it to the rear, underside of
the fuselage.
14