GREAT PLANES F4U Corsair Manuel d'instruction - Page 14
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1. Use a felt-tip pen or 1/8" [3mm]-wide tape to accurately
mark the C.G. on the top of the wing on both sides of the
fuselage. The C.G. is located 2" [51mm] back from the
leading edge of the wing at the root.
This is where your model should balance for the first
flights. Later, you may wish to experiment by shifting the
C.G. up to 1/4" [6.4mm] forward or 1/4" [6.4mm] 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.
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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.
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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 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.
IMPORTANT: If you found it necessary to add any weight,
recheck the C.G. after the weight has been installed.
Balance the Model Laterally
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1. With the wing level, have an assistant help you lift the
model by the motor propeller shaft and the bottom of the
fuse under the TE of the fin. Do this several times.
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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.
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 airplane 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. Vibration may
also damage your radio receiver and battery. We use a Top
Flite Precision Magnetic Prop Balancer
workshop and keep a Great Planes Fingertip Prop Balancer
(GPMQ5000) in our flight box.
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(TOPQ5700) in the