GREAT PLANES SU-31 Manuel d'instruction - Page 13

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Set the Control Throws

Use a Great Planes AccuThrow

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 at the 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

ELEVATOR:

2-3/4" [70mm] up

2-3/4" [70mm] down 1-1/4" [32mm] down

AILERONS:

1-1/2" [38mm] up

1-1/2" [38mm] down 3/4" [19mm] down

RUDDER:

4" [102mm] right

4" [102mm] left

IMPORTANT: The Sukhoi SU-31 3D Park Flyer ARF 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 Sukhoi SU-31 ARF 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 (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.

(or a ruler) to accurately

™

Low Rate

1-1/4" [32mm] up

3/4" [19mm] up

3" [76mm] right

3" [76mm] left

At this stage the model should be in ready-to-fly condition

with all of the systems in place including the motor, battery,

landing gear and the radio system.

1. Use a felt-tip pen or 1/8"-wide tape to accurately mark

the C.G. on the bottom of the wing on both sides of the

fuselage. The C.G. is located 4-1/4" [108mm] 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 5/16" [8mm] forward or 5/16" [8mm] back to

change the flying characteristics. 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. Place the model on a Great Planes CG Machine, or lift

it at the balance point you marked.

3. If the tail drops, the model is "tail heavy" and the battery

pack 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 must be shifted aft or weight must be

added to the tail to balance. If possible, relocate the battery

pack to minimize or eliminate any additional ballast required. If

additional weight is required use Great Planes (GPMQ4485)

"stick on" lead. A good place to add stick-on nose weight is just

behind the motor. Begin by placing incrementally increasing

amounts of weight on the top of the fuse above the motor 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 a slot in the bottom of the

fuse and gluing it permanently inside.

4. IMPORTANT: If you found it necessary to add any

weight, recheck the C.G. after the weight has been installed.