24
BALANCING
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1) It is critical that the Whisper be balanced cor-
rectly. Improper balance will cause your plane to lose
control and crash. The center of gravity is located
2-3/8” back from the leading edge of the wing, at
the fuselage sides. This location is recommended
for initial test flying and trimming. There is a 3/8”
margin forward and aft, but it is not recommended
that the center of gravity be located any further back
than 2-3/4”.
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2) Mount the wing securely to the fuselage us-
ing six # 64 rubber bands per side. Using a couple of
pieces of masking tape, place them on the bottom side
of the wing 2-3/8” back from the leading edge, at the
fuselage sides.
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3) Place your fingers on the masking tape and
carefully lift the plane.
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4) If the nose of the plane falls, the plane is nose
heavy. To correct this slide the flight battery further
back in the fuselage. If the tail of the plane falls, the
plane is tail heavy. To correct this, slide the flight
battery forward in the fuselage.
Once you have flown and become familiar with
the flight characteristics of the Whisper, the bal-
ance point can be moved forward or aft to change the
flight characteristics. Moving the balance point back
will cause the Whisper to be more responsive, but less
stable and increase the stall speed. Moving the bal-
ance point forward will cause the Whisper to be more
stable, but the control sensitivity will be sluggish. Once
you find the optimum center of gravity, we suggest
placing a mark on the battery pack, next to one of the
bulkheads. This way you will be able to install the
battery pack in the proper location every time.
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1) We highly recommend setting up the Whis-
per using the control throws listed. We have listed
control throws for both initial test flying/training and
for the accomplished pilot. If this is your first air-
plane, please set the control throws according to the
training settings. These settings allow the airplane to
fly smoother and make it easier to control.
CONTROL THROWS
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2) Turn on the radio system. With the trim tabs
on the transmitter in neutral, center the control sur-
faces by making adjustments to the clevises or ad-
justable servo connectors. The servo arms should be
centered also.
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3) When the elevator and rudder control sur-
faces are centered, move the control stick to the full
deflection for each control surface. Use a ruler and
check the amount of the control throw. The control
throws should be measured at the widest point of
each surface!
By moving the position of the clevis at the con-
trol horn toward the outermost hole, you will
decrease the amount of throw of that control surface.
Moving the clevis toward the control surface will in-
crease the amount of throw.
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1) Check the operation and direction of the
elevator, rudder and throttle.
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A) Turn your radio system on.
**CAUTION** Do not turn the receiver on unless
the transmitter is turned on first. Always turn the
transmitter on first. NEVER allow hands or clothing
to get in the way of the propeller when the radio is
turned on. Sudden unwanted radio signals or turning
the radio on with the throttle lever set at full throttle
can turn on the motor unintentionally. Always make
sure the throttle lever is set to off before turning on
the transmitter.
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B) Check the elevator first. Pull back on
the elevator stick. The elevator should move up. If it
does not, flip the servo reversing switch on your
transmitter to change the direction.
FLIGHT PREPARATION
INITIAL FLYING/TRAINING
Elevator:
3/8” up
3/8” down
Rudder:
5/8” right
5/8” left
ACCOMPLISHED PILOT
Elevator:
5/8” up
5/8” down
Rudder:
7/8” right
7/8” left
Do not use the accomplished pilot settings
for initial test flying or training.
