Center Of Gravity; Control Throws - Hangar 9 Sundowner 36 ARF Assembly Manual

Center of Gravity

An important part of preparing the aircraft for flight is
properly balancing the model.
CAUTION: do not inadvertently skip this step!

1. The recommended Center of Gravity (CG) location for
your model is 2 / -inch to 2 / -inch (60mm–70mm) back
3 3
8 4
from the leading edge of the wing as shown. We recommend
starting at the forward CG and making changes to suit your
preferred flying style. Mark the location of the CG on the
bottom of the wing with a felt-tipped pen.

2. When balancing your model, make sure it is assembled
and ready for flight. Support the plane upright at the marks
made on the wing with your fingers or a commercially
available balancing stand. This is the correct balance point
for your model.
Balancing Stand
Hangar 9 Sundowner 36 ARF

3. You should find the CG to be very close with the
components installed as shown in this manual. If the nose
of your aircraft hangs low, add weight to the rear of the
aircraft. If the tail hangs low, add weight to the nose of the
aircraft. Stick-on weights are available at your local hobby
store and work well for this purpose.
Note: When using an EP power system, you can move
the motor battery to correct the Center of Gravity if it
is off. Mark the location of the battery on the battery
tray using a felt-tipped pen so it can be returned to
this position if it is removed from your model.
After the first flights, the CG position can be adjusted for
your personal preference.

Control Throws


1. Turn on the transmitter and receiver of your model.
Check the movement of the rudder using the transmitter.
When the stick is moved right, the rudder should also move
right. Reverse the direction of the servo at the transmitter if
necessary.

2. Check the movement of the elevator with the radio
system. Moving the elevator stick toward the bottom of the
transmitter will make the airplane elevator move up.

3. Check the movement of the ailerons with the radio
system. Moving the aileron stick right will make the right
aileron move up and the left aileron move down.

4. Use a ruler to adjust the throw of the elevator, ailerons
and rudder.
Aileron:
High Rate:
Up: 7/16-inches 11mm
Down: 11/32-inches 9mm
Low Rate:
Up: 9/32-inches 7mm
Down: 5/32-inches 4mm
Note: Measure the aileron throw from
the inboard edge of the aileron.
Elevator:
High Rate:
Up: 11/32-inches 9mm
Down: 11/32-inches 9mm
Low Rate:
Up: 3/16-inches 5mm
Down: 3/16-inches 5mm
Note: Measure the elevator throw from
the inboard edge of the elevator.
30% Expo
30% Expo
15% Expo
15% Expo
25% Expo
25% Expo
20% Expo
20% Expo
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