GREAT PLANES Douglas DC-3 Buku Petunjuk - Halaman 17

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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 motors, landing

gear, complete radio system, and 8-cell battery.

1. Use a felt-tip pen or 1/8"-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 2-7/16" [62mm] back from the

leading edge of the wing.

This is where your model should balance for the first

flights. Later, you may wish to experiment by shifting the

C.G. up to 2-5/16" [59mm] forward or 2-3/4" [70mm] 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.

2. With the wing attached to the fuselage, all parts of the

model installed (ready to fly), 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" 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

inside of the nose section of the fuselage. Begin by placing

incrementally increasing amounts of weight on the bottom of

the fuse over the nose 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

and glued permanently inside the fuselage.

Note: Do not rely upon the adhesive on the back of the lead

weight to permanently hold it in place. Use #2 sheet metal

screws, RTV silicone or epoxy to permanently hold the

weight in place.

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

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.

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 the back cover and place it in 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 batteries the night before

you go flying and at other times as recommended by the

radio manufacturer.