11
ENGLISH
❍
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. weight, or GPMQ4646 for the
2 oz. 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.
IMPORTANT:
If you found it necessary to add any weight,
recheck the C.G. after the weight has been installed.
BALANCE THE MODEL LATERALLY
❍
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.
❍
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.
FLIGHT PREPARATION
BALANCE THE MODEL (C.G.)
More than any other factor, the C.G. (balance point) can have
the greatest effect on how a model flies and may determine
whether or not your first flight will be successful. If you
value this model and wish to enjoy it for many flights.
DO
NOT OVERLOOK THIS IMPORTANT PROCEDURE.
A model
that is not properly balanced will be unstable and possibly
unflyable.
At this stage the model should be in ready-to-fly condition
with all of the systems in place including the engine, landing
gear, covering and the radio system.
❍
Use a felt-tip pen or 1/8"-wide tape to accurately mark
the C.G. on the top of the wing. The C.G. is located 80 mm
back from the leading edge of the wing. For 3D flying, CG
can be more aft, up to 100 mm.
❍
With the wing attached to the fuselage, all parts of the
model installed (ready to fly) and an empty fuel tank,
place the model upsidedown on a Great Planes CG
Machine, or lift it upside-down at the balance point you
marked.
Summary of Contents for FLW4090
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