Great Planes 38% Extra 330S ARF - GPMA1290 - Manual (Page 21)

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(Move the ruler forward)
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3. Defl ect the control surface and move your ruler
forward so it will be contacting the trailing edge. Read the
measurement to get the throw.
These are the recommended control surface throws:
HIGH RATES
Inches Millimeters Degrees
ELEVATOR: 1-3/4" up 45mm up 16° up
1-3/4" down 45mm down 16° down
RUDDER: 7" right 180mm right 29° right
7" left 180mm left 29° left
AILERONS: 2" up 50mm up 20° up
2" down 50mm down 20° down
LOW RATES
Inches Millimeters Degrees
ELEVATOR: 1" up 25mm up 9° up
1" down 25mm down 9° down
RUDDER: 5" right 130mm right 22° right
5" left 130mm left 22° left
AILERONS: 1-3/8" up 35mm up 14° up
1-3/8" down 35mm down 14° down
3D RATES
Inches Millimeters Degrees
ELEVATOR: 4-3/4" up 120mm up 42° up
4-3/4" down 120mm down 42° down
RUDDER: 8" right 200mm right 32° right
8" left 200mm left 32° left
AILERONS: 3-1/2" up 90mm up 40° up
3-1/2" down 90mm down 40° down
IMPORTANT: The 38% Great Planes Extra 330S ARF
has been extensively fl ight 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 Extra 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.”
Note: We have also found that approximately 5% up elevator-
to-rudder mixing will improve mild down-pitch coupling that
occurs during rudder inputs.
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 engine, propeller
and spinner and the complete radio system.
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1. Assemble the plywood C.G. cradles as shown.
❏
2. Bolt the wings to the fuselage with the wing tube.