Value Hobby TWEETY - 25 Instruction Manual - page 17
11
7m
m
Step 2: Position the front of the engine drive washer
approx 115‐120mm from the firewall, depending on the
engine you selected. Mark the location of the engine
mount bolt holes onto the mount rails using a Dead
Center Hole Locator. Remove the engine from the mount
rails and create threads in the four mounting holes. Attach
the engine to the mount.
Installing the Receiver
Step 1: Secure your receiver inside the fuselage. Then
connect the servos to your receiver. Make sure the leads
to not interfere with any of the pushrods.
Step 2: Pre‐cut openings are provided for mounting an
on/off switch. If the hole spacing does not fit your switch,
you may need to modify the pre‐cut opening, or mount it
in a different location. You can also mount an optional
charge jack receptacle below the switch.
Balancing the Model
After you have finished building the model into ready‐to‐
fly condition you can set the C.G. of the model. You need
to have all of the systems installed before you begin,
including the nitro engine or electric motor, landing gear,
radio system, and battery pack.
The C.G. is located 64mm back from the leading edge of
the wing at the fuselage.
This is where your model should balance for the first
flights. Later you may wish to experiment by shifting the
C.G. forward or back to change the flying characteristics.
Moving the C.G. forward may improve the smoothness
and stability, but the model may then require more speed
for takeoff and make it more difficult to slow for landing.
Moving the C.G. aft makes the model more maneuverable,
but could also cause it to become too difficult to control.
When balancing your model, support the plane upright at
the C.G. position on the bottom of the wing with your
fingers or a commercially available balancing stand. Move
the battery or receiver inside the fuselage as necessary so
the model hangs level or slightly nose down. This is the
correct balance point for your model.
After the first flights, the CG position can be adjusted for
your personal preference.