Great Planes Little Toni ARF - GPMA1320 - Manual (Page 21)

Use a Great Planes AccuThrow (or a ruler) to accurately
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.
NOTE: The throws are measured at the widest part of the
elevators, rudder and ailerons.
At this stage the model should be in ready-to-fly condition
with all of the systems in place including the engine, landing
gear, covering and the radio system.
❏
1. Use a felt-tip pen or 1/8" [2mm] wide tape to accurately
mark the C.G. on the top of the wing on both sides of the
fuselage. The C.G. is located 3-3/8" [86mm] back from the
leading edge of the wing, measured at the fuselage sides.
2. With the wing attached to the fuselage, all parts of the
model installed (ready to fly) and an empty fuel tank, place
the model upside-down on a Great Planes CG Machine, or
lift it upside-down at the balance point you marked .
3. If the tail drops, the model is “tail heavy” and weight must
be added to the nose to balance. If the nose drops, the
model is “nose heavy” and weight must be added to the tail
to balance. If additional weight is required, nose weight may
be easily added by using a “spinner weight” (GPMQ4645 for
the 1 oz. weight, or GPMQ4646 for the 2 oz. weight). If
spinner weight is not practical or is not enough, use Great
Planes (GPMQ4485) “stick-on” lead. A good place to add
stick-on nose weight is to the firewall (don’t attach weight to
the cowl—it is not intended to support weight). Begin by
placing incrementally increasing amounts of weight on the
bottom of the fuse over the firewall until the model balances.
Once you have determined the amount of weight required,
it can be permanently attached
Note: Do not rely upon the adhesive on the back of the lead
weight to permanently hold it in place. Over time, fuel and
This is where your model should balance for the first
flights. Later, you may wish to experiment by shifting the
C.G. up to 1/2" [13mm] forward or 1/2" [13mm] back to
change the flying characteristics. At this time, start at the
recommended balance point and do not at any time
balance the model outside the specified range.
More than any other factor, the C.G. (balance point) can
have the greatest effect on how a model flies, and may
determine whether or not your first flight will be
successful. If you value this model and wish to enjoy it for
many flights, DO NOT OVERLOOK THIS IMPORTANT
PROCEDURE. A model that is not properly balanced will
be unstable and possibly unflyable.
Balance the Model C.G.
IMPORTANT: The Little Toni has been extensively flown
and tested to arrive at the throws at which it flies best.
Flying your model at these throws will provide you with
the greatest chance for successful first flights. If, after you
have become accustomed to the way the Little Toni flies,
you would like to change the throws to suit your taste, that
is fine. However, too much control throw could make the
model difficult to control, so remember, “more is not
always better.”
These are the recommended control surface throws.
High Rate Low Rate
Elevator 3/4" [19mm] up 1/2" [13mm] up
3/4" [19mm] down 1/2" [13mm] down
Rudder 1-1/8" [28mm] right 3/4" [19mm] right
1-1/8" [28mm] left 3/4" [19mm] left
Ailerons 3/8" [10mm] up 1/4" [6mm] up
3/8" [10mm] down 1/4" [16mm] down
Set the Control Throws
21