Assemble The Balance Stand; Balance The Model (C.g.) - GREAT PLANES Reactor ARF .61-.91 SPORT BIPLANE Instruction Manual

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4. Measure and set the low rate elevator throws and the
high and low rate throws for the rest of the control surfaces
the same way.
These are the recommended control surface throws:
3D RATE
Up Down
2-3/4" 2-3/4"
ELEVATOR
[70mm] [70mm]
43° 43°
Right Left
5" 5"
RUDDER
[127mm] [127mm]
44° 44°
Up Down
1-1/2" 1-1/2"
AILERONS
[38mm] [38mm]
24° 24°
NOTE: The throws are measured at the widest part of the
elevators and rudder.

Assemble the Balance Stand

For your convenience, a balance stand is included with your
Reactor .60 biplane. The Reactor could be balanced the
way you probably balance most of your models (with your
fi ngertips), but once assembled, the balance stand makes
the procedure easier, faster and more accurate. One of the
advantages is that you don't have to set the model down
to add weight and pick it up again to see the effects. And
you can stand back and get a better view of how the model
balances (nose-up, nose-down, level). All you have to do is
place the model on the stand, add weight and observe the
result. Assemble your balance stand as illustrated:
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1. Glue the side braces to the uprights—be certain to
make a right and a left!
HIGH RATE LOW RATE
Up Down Up Down
1-3/8" 1-3/8" 7/8"
[35mm] [35mm] [22.2mm] [22.2mm]
20° 20° 13°
Right Left Right
3-1/2" 3-1/2" 2-1/4" 2-1/4"
[89mm] [89mm] [57mm] [57mm]
29° 29° 18°
Up Down Up Down
7/8" 7/8" 3/8"
[22.2mm] [22.2mm] [9.5mm] [9.5mm]
13° 13° 6°
7/8"
13°
Left
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2. Glue the uprights to the sides, front and back. Glue a
doubler to each upright, then securely glue the dowels into
the rounded notches in the top of both uprights.
18°

Balance the Model (C.G.)

3/8"
More than any other factor, the C.G. (center of gravity/
6° balance point) can have the greatest effect on how a
model fl ies and could determine whether or not your fi rst
fl ight will be successful. If you value your model and wish
to enjoy it for many fl ights, DO NOT OVERLOOK THIS
IMPORTANT PROCEDURE. A model that is not properly
balanced may be unstable and possibly unfl yable.
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1. If you haven't yet marked the balance point, return to
step 1 on page 26 and mark the balance point as illustrated.
This will require removal of the top wing. At this stage the model
should be in ready-to-fl y condition with all of the components
in place including the complete radio system, engine, muffl er,
propeller, spinner, pilot and an empty fuel tank. If you've built
the electric version, install the motor battery.
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2. Use weights or clamps to secure the balance stand
so it will not tip over. Place the model on the balance stand
with middle line on the bottom of the top wing resting on the
dowels on the top of the stand. Be certain the needle valve,
landing gear or propeller are not interfering with the stand
causing a false reading. If not using the balance stand lift the
model with your fi ngers on the middle line.
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