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This is where your model should balance for the
first flights . Later, you may wish to experiment by
shifting the C .G . up to 3/8" [10mm] forward or 3/8"
[10mm] 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 . In any case,
start at the recommended
balance point and do not at any time balance
the model outside the specified range .
4 -1/8" [105mm]
o
2 . With the wing attached to the fuselage, all parts
of the model installed (ready to fly) 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 .
o
3 . If the tail drops, the model is “tail heavy” and the
battery pack and/or receiver must be shifted forward
or weight must be added to the nose to balance . If
the nose drops, the model is “nose heavy” and the
battery pack and/or receiver must be shifted aft or
weight must be added to the tail to balance . If possible,
relocate the battery pack and receiver to minimize or
eliminate any additional ballast required . If additional
weight is required, nose weight may be easily added
by using a “spinner weight” (GPMQ4645 for the 1 oz .
[28g] weight, or GPMQ4646 for the 2 oz . [57g] weight) .
If spinner weight is not practical or is not enough, use
Great Planes (GPMQ4485) “stick-on” lead . A good
place to add stick-on nose weight is to the firewall
(don’t attach weight to the cowl—it is not intended
to support weight) . Begin by placing incrementally
increasing amounts of weight on the bottom of the
fuse over the firewall until the model balances . Once
you have determined the amount of weight required,
it can be permanently attached . If required, tail weight
may be added by cutting open the bottom of the fuse
and gluing it permanently inside .
Note: Do not rely upon the adhesive on the back of the
lead weight to permanently hold it in place . Over time,
fuel and exhaust residue may soften the adhesive
and cause the weight to fall off . Use #2 sheet metal
screws, RTV silicone or epoxy to permanently hold
the weight in place .
o
4 .
IMPORTANT: If you found it necessary to add
any weight, recheck the C .G . after the weight has
been installed .
BALANCE THE MODEL LATERALLY
o
1 . With the wing level, have an assistant help you
lift the model by the engine propeller shaft and the
bottom of the fuse under the TE of the fin . Do this
several times .
o
2 . If one wing always drops when you lift the model,
it means that side is heavy . Balance the airplane by
adding weight to the other wing tip .
An airplane that
has been laterally balanced will track better in
loops and other maneuvers.
PREFLIGHT
IDENTIFY YOUR MODEL
No matter if you fly at an AMA sanctioned R/C club
site or if you fly somewhere on your own, you should
always have your name, address, telephone number
and AMA number on or inside your model . It is
required at all AMA R/C club flying sites and AMA
sanctioned flying events . Fill out the identification tag
on page 33 and place it on or inside your model .
CHARGE THE BATTERIES
Follow the battery charging instructions that came with
your radio control system to charge the batteries . You
should always charge your transmitter and receiver
batteries the night before you go flying, and at other
times as recommended by the radio manufacturer .
CAUTION: Unless the instructions that came
with your radio system state differently, the
initial
charge on
new transmitter and receiver batteries
should be done for 15 hours
using the slow-
charger that came with the radio system .
This will “condition” the batteries so that the next
charge may be done using the fast-charger of
your choice . If the initial charge is done with a
fast-charger, the batteries may not reach their
full capacity and you may be flying with batteries
that are only partially charged .
BALANCE PROPELLERS
Carefully balance your propeller and spare
propellers before you fly . An unbalanced prop can
be the single most significant cause of vibration
that can damage your model . Not only will engine
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