Balance Your Model Laterally - Hobbico Spectrum Assembly Instructions Manual

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Table Of Contents

Table of Contents

in both standard or metric measurements.

Make sure the control surfaces move in the proper

direction as illustrated in the following sketch:

4-CHANNEL RADIO SETUP

(STANDARD MODE 2)

4-CHANNEL

TRANSMITTER

4-CHANNEL

TRANSMITTER

4-CHANNEL

TRANSMITTER

4-CHANNEL

TRANSMITTER

Balance Your Model

Note: This section is VERY important and must

NOT be omitted! A model that is not properly

balanced will be unstable and possibly unflyable.

1. The balance point (C.G.) is located 5-1/4"

[132mm] back from the leading edge of the wing.

Balance your Spectrum using a Great Planes C.G.

Machine

Airplane Balancer (GPMR2400) for the

™

most accurate results. This is the balance point at

which your model should balance for your first

ELEVATOR MOVES UP

RIGHT AILERON MOVES UP

LEFT AILERON MOVES DOWN

RUDDER MOVES RIGHT

CARBURETOR WIDE OPEN

flights. After initial trim flights and when you

become more acquainted with your Spectrum, you

may wish to experiment by shifting the balance up

to 5/16" [8mm] forward or backward to change its

flying characteristics. Moving the balance forward

may improve the smoothness and stability, but the

model may then require more speed for takeoff

and may become more difficult to slow for landing.

Moving the balance aft makes the model more

agile with a lighter, snappier "feel" and often

improves knife-edge capabilities. In any case,

please start at the location we recommend. Do not

at any time balance your model outside the

recommended range.

2. With the wing attached to the fuselage, all

parts of the model installed (ready to fly), and an

empty fuel tank, block up the tail as necessary to

level the stab. Lift the model at the desired balance

point, and observe the tail of the aircraft. If the tail

drops, the model is "tail heavy" and you must add

weight* to the nose to balance the model. If the

nose drops, it is "nose heavy" and you must add

weight* to the tail to balance the model.

Note: Nose weight may be easily installed by

using a "spinner weight." Tail weight may be added by

using Great Planes (GPMQ4485) "stick-on" lead

weights.

* If possible, first attempt to balance the model by

changing the position of the receiver battery. If you

are unable to obtain good balance by doing so,

then it will be necessary to add weight to the nose

or tail to achieve the proper balance point.

Remember to secure the receiver and battery after

your model has been balanced.