19
❏
2. Install the battery. Attach the wings with the M3 x 10
SHCS screws, lock washers and fl at washers used before,
then install the canopy hatch.
3-1/4"
83mm
The recommended C.G. is 3-1/4" [83mm] back from
the leading edge of the wing where it meets the
fuselage. The recommended C.G. range is from
2-3/4" – 3-3/4" [70mm - 95mm].
❏
2. Use a Great Planes C.G. Machine with the rulers set to
the recommended C.G. and place the model upside-down
on the stand, or mark the recommended C.G. on top of the
wing and lift the model upside-down with your fi ngertips.
3. Shift the battery forward or aft or add nose or tail ballast
as necessary to get the model to balance.
Balance the Model Laterally
❏
1. Support the bottom of the rudder (a servo case was
used for the model in the image) and lift the Sbach several
times by the propeller shaft to see if one wing drops. Do this
several times to get a consistent reading.
❏
2. If one wing drops consistently, add weight to the
opposite tip by sticking it to the outside or strategically
concealing it inside the balsa tip. An airplane that has been
laterally balanced will track better in fl ight and maintain its
heading better during maneuvers when the plane is climbing.
❏
3. This static lateral balance check will be a good starting
point, but performance in the air will be the fi nal determining
factor whether or not the model is laterally balanced.
Performing high-G pulls will reveal if further lateral balance
is required. Adjust the weight as necessary.
PREFLIGHT
Motor Safety Precautions
Failure to follow these safety precautions may result
in severe injury to yourself and others.
●
Use safety glasses when running motors.
●
Do not run the motor in an area of loose gravel or sand;
the propeller may throw such material in your face or eyes.
●
Keep your face and body as well as all spectators away
from the plane of rotation of the propeller when the motor
is running.
●
Keep these items away from the prop: loose clothing,
shirt sleeves, ties, scarfs, long hair or loose objects such
as pencils or screwdrivers that may fall out of shirt or
jacket pockets into the prop.
