Top Flite TOPA0400 - Manual (Page 57)

Redundant and fail-safe battery systems are
recommended.
The use of anti-glitch devices for long leads are
recommended
There is no maximum engine displacement limit, as
it is the position of this body that an underpowered
aircraft presents a greater danger than an
overpowered aircraft. However, the selection of
engine size relative to airframe strength and power
loading mandates good discretionary judgement by
the designer and builder. Current AMA maximums
for engine displacement are 6.0 cu. in. for two-stroke
and 9.6 cu. in. for four-stroke engines. These
maximums apply only to AMA Sanctions concerning
competition events (such as 511, 512, 515 and 520)
and, as such, the maximums apply. All IMAA (non
competition) events should be sanctioned as Class
“C” events, in which these engine size maximums do
not apply.
Generally, it is recommended that no attempt
should be made to fly a radio controlled model
aircraft with a gasoline engine in which the model
aircraft weight would exceed twelve (12) pounds
(underpowered) per cubic inch of engine
displacement, or be less than five (5) pounds
(overpowered) per cubic inch of engine
displacement. Example: Using a 3 cu. in. engine, a
model would likely be underpowered at an aircraft
weight greater than 36 pounds. With the same
engine, an aircraft weighing less than 15 pounds
would likely be overpowered.
Servo arms and wheels should be rated heavy
duty. Glass filled servo arms and control horns are
highly recommended.
Control surfaces linkages are listed in order of
preference:
1. Cable system (pull-pull). A tiller bar is highly
recommended along with necessary bracing.
2. Arrow Shaft, fiberglass or aluminum, 1/4” or
5/16” O.D. Bracing every six (6) to ten (10)
inches is highly recommended.
3. Tube-in-tube (nyrod). Bracing every few
inches is highly recommended. Inner tube
should be totally enclosed in outer tube.
4. Hardwood dowel, 3/8” O.D. Bracing every six
(6) to ten (10) inches is highly recommended.
Hinges should be rated heavy duty and
manufactured for Giant Scale use primarily. Home-
made and original design hinges are acceptable if
determined to be adequate for the intended use.
Clevis (steel, excluding heavy-duty ball links) and
attachment hardware should be heavy duty 4-40
threaded rod type. 2-56 threaded size rod is
acceptable for some applications (e.g. throttle). Clevis
is to have lock nuts and sleeve or spring keepers.
Propeller tips should be painted or colored in a
visible and contrasting manner so as to increase
the visibility of the propeller tip arc.
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THIS MODEL BELONGS TO:
NAME
ADDRESS
CITY STATE ZIP
PHONE #
AMA # / SFA #
Fill in the necessary information,
then cut out this placard and place it
inside of your model. Don't forget to
protect it from fuel and moisture.