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GET THE MODEL READY TO FLY

Check the Control Directions

❏

1. Turn on the transmitter and receiver and center the trims.

❏

2. With the transmitter and receiver still on, check all the

control surfaces to see if they are centered. If necessary, adjust

the pushrod connectors on the control surface pushrods.

3-CHANNEL RADIO SETUP

(STANDARD MODE 2)

ELEVATORS MOVE UP

❏

3. Make certain that the control surfaces and the throttle

respond in the correct direction as shown in the diagram.

If any 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 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.

RIGHT AILERON MOVES UP

LEFT AILERON MOVES DOWN

FULL THROTTLE

™

(or a ruler) to accurately

These are the recommended control surface throws:

High Rate

ELEVATOR: 5/16" [8mm] up

5/16" [8mm] down

AILERONS: 3/16" [4.8mm] up

3/16" [4.8mm] down 3/32" [2.4mm] down

NOTE: The throws are measured at the widest part of

the control surfaces.

IMPORTANT: The L-39 ARF has been extensively ﬂ own

and tested to arrive at the throws at which it ﬂ ies best. Flying

your model at these throws will provide you with the greatest

chance for successful ﬁ rst ﬂ ights. If, after you have become

accustomed to the way the L-39 ﬂ ies, you would like to

change the throws to suit your taste, that is ﬁ ne. However,

too much control throw could make the model difﬁ cult 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 ﬂ ies, and

may determine whether or not your ﬁ rst ﬂ ight will be

successful. If you value this model and wish to enjoy it for

many ﬂ ights, DO NOT OVERLOOK THIS IMPORTANT

PROCEDURE. A model that is not properly balanced will

be unstable and possibly unﬂ yable.

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

with all of the systems in place including the receiver, ESC,

and battery pack.

❏

1. The C.G. is located 1-15/16" [49mm] back from

the leading edge of the wing at the fuselage (the seam

where the wing panels have been joined to the fuselage).

If you mark the C.G. position onto the top of the wing, be

very careful if using tape as it could damage the paint when

removed. Also, do not attempt to remove felt-tip pen marks

with alcohol. We suggest making small marks on the wing

beneath the ducted fan inlets.

This is where your model should balance for the ﬁ rst

ﬂ ights. Later, you may wish to experiment by shifting the

C.G. up to 3/16" [4.8mm] forward or 1/8" [3.2mm] back to

change the ﬂ ying characteristics. Moving the C.G. forward

may improve the smoothness and stability, but the model

may be more difﬁ cult to slow for landing. Moving the C.G.

aft makes the model more maneuverable, but could also

cause it to become too difﬁ cult to control. In any case,

start at the recommended balance point and do not at

any time balance the model outside the speciﬁ ed range.

Low Rate

1/8" [3.2mm] up

1/8" [3.2mm] down

3/32" [2.4mm] up