30
5 -1/2" [139 mm]
5 -1/2" [139 mm]
❏
1. If using a Great Planes C.G. Machine
™
, set the
rulers to 5 -1/2" [139 mm]. If not using a C.G. Machine,
use a fi ne-point felt tip pen to mark lines on the top of
wing on both sides of the fuselage 5 -1/2" [139 mm]
back from the leading edge, at the leading edge “break”
(or inboard guns). Apply narrow (1/16" [2mm]) strips of
tape over the lines so you will be able to feel them when
lifting the model with your fi ngers.
This is where your model should balance for the
fi rst fl ights. Later, you may experiment by shifting
the C.G. 1/8" [4 mm] forward or 1/8" [4mm] back to
change the fl ying characteristics. Moving the C.G.
forward will improve the smoothness and stability,
but the model will then be less aerobatic (which
may be fi ne for less-experienced pilots). Moving the
C.G. aft makes the model more maneuverable and
aerobatic for experienced pilots. In any case,
start at
the recommended balance point
and do not at any
time balance the model outside the specifi ed range.
❏
2. With the wing attached to the fuselage, all parts
of the model installed (ready to fl y) and an empty fuel
tank, place the model upside-down on a Great Planes
CG Machine, or lift it upside-down at the balance point
you marked.
❏
3. If the tail drops, the model is “tail heavy.” If the nose
drops, the model is “nose heavy.” Use Great Planes
“stick-on” lead (GPMQ4485) to balance the plane. To fi nd
out how much weight is required, place incrementally
increasing amounts of weight on the bottom of the
fuselage over the location where it would be mounted
inside until the model balances. A good place to add
stick-on nose weight is to the fi rewall. Do not attach
weight to the cowl—this will cause stress on the cowl
and could cause the cowl ring to break loose from the
cowl.
Note:
The manufacturer has already installed
some weight on the fi rewall. If the plane is nose heavy,
start by removing some of the pre-installed nose weight
before adding tail weight. Once you have determined
if additional weight needs to be installed, it can be
permanently attached.
Do not rely upon the adhesive on the back of the lead
weight to permanently hold it in place. Over time, fuel
vibration and exhaust residue may soften the adhesive
and cause the weight to fall off. Instead, permanently
attach the weight with glue or screws.
Note:
It is highly recommended that with gas powered
planes the ignition system and all its components be
separated from the radio system components by at least
10" [254mm] to prevent ignition noise from interfering
with the radio system. If the plane is tail heavy, do not
move the receiver battery forward closer to the ignition
system. If the plane is nose heavy, do not move the
ignition battery aft closer to the receiver.
❏
4.
IMPORTANT:
If you found it necessary to add
any weight, recheck the C.G. after the weight has been
installed.
CHECK LIST
During the last few moments of preparation your mind
may be elsewhere anticipating the excitement of the
fi rst fl ight. Because of this, you may be more likely to
overlook certain checks and procedures that should
be performed before the model is fl own. To help avoid
this, a check list is provided to make sure these
important areas are not overlooked. Many are covered
in the instruction manual, so where appropriate, refer
to the manual for complete instructions. Be sure to
check the items off as they are completed (that’s why
it’s called a
check list!
).
❏
1. Fuelproof all areas exposed to fuel or exhaust
residue such as the cowl ring, wing saddle area, etc.
❏
2. Check the C.G. according to the measurements
provided in the manual.
❏
3. Be certain the battery and receiver are securely
mounted in the fuse. Simply stuffi ng them into place
with foam rubber is not suffi cient.
❏
4. If you still fl y on 72MHz, extend your receiver
antenna and make sure it has a strain relief inside the
fuselage to keep tension off the solder joint inside the
receiver.
❏
5. Balance your model
laterally
as explained in the
instructions.
❏
6. Use threadlocking compound to secure critical
fasteners such as the set screws that hold the wheel
axles to the struts, screws that hold the carburetor arm
(if applicable), engine bolts, etc.
❏
7. Add a drop of oil to the axles so the wheels will
turn freely.
❏
8. Give the control surfaces a quick tug to make sure
all hinges are
securely
glued in place.
❏
9. Reinforce holes for wood screws with thin CA
where appropriate (servo mounting screws, aileron
hatches, etc.).
❏
10. Confi rm that all controls operate in the correct
direction and the throws are set up according to the
manual. Checking the direction should be performed
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