GREAT PLANES YAK 55 Kullanım Kılavuzu - Sayfa 13

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of the controls respond in the wrong direction, use the servo

reversing in the transmitter to reverse the servos connected to

those controls. Be certain the control surfaces have remained

centered. Adjust if necessary.

Set the Control Throws

Use a ruler to accurately measure and set the control throw

of each control surface as indicated in the chart that follows.

If your radio does not have dual rates, we recommend

setting the throws between the high and low rate setting.

NOTE: The throws are measured at the widest part of the

elevators, rudder and ailerons.

These are the recommended control surface throws:

High Rate/3D

ELEVATOR

3" [76mm] up

3" [76mm] down

RUDDER

4-1/2" [114mm] right

4-1/2" [114mm] left

AILERONS

2-5/8" [67mm] up

2" [51mm] down

Note: High rates are 3D rates.

IMPORTANT: The YAK 55 EP w/ FlightFlex has been

extensively flown and tested to arrive at the throws at

which it flies best. Flying your model at these throws will

provide you with the greatest chance for successful first

flights. If, after you have become accustomed to the way

the YAK 55 flies, you would like to change the throws to

suit your taste, that is fine. However, too much control

throw could make the model difficult to control, so

remember, "more is not always better."

Balance the Model CG

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 paint, and the radio system.

Low Rate

1-1/2" [19mm] up

1-1/2" [19mm] down

1-1/2" [38mm] right

1-1/2" [38mm] left

1" [25.4mm] up

7/8" [22mm] down

❏

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 3-3/8" [86mm] back from the

leading edge of the wing at the fuselage.

This is where your model should balance for the first

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

C.G. up to 1/2" [13mm] forward or 3/8" [9mm] 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 all parts of the model installed, including the

battery (ready to fly) lift it upside-down on your fingertips 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, begin by placing

incrementally increasing amounts of weight on the bottom of

the fuse 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 permanently installed.