Throttle servo linkage precautions
To effectively use the governor, observe the fol-
lowing precautions when connecting the servo
linkage.
Make the servo operating range as wide as
possible. Make the throw of the transmitter
EPA (ATV) function and AFR function as
close as possible to 100%. The governor will
not operate at throws lower than 50%.
Fly with the governor turned OFF and adjust
the needle so that the engine smoothly reacts
to movement of the transmitter stick.
If there is a point at which the reaction of the
engine is considerably different due to a too
rich or too lean mixture, the governor may
not operate to its maximum potential.
Fuselage vibration countermeasures
If the helicopter frame is weak, or the engine
mount is deformed or not installed properly, the
vibrations applied to the engine will increase.
Engine vibrations will lead to unstable speed
and prevent the governor from maximum perfor-
mance. Therefore, make sure that the engine is
vibration free and that the carburetor is of good
liner design because the governor cannot correct
engine problems.
Use of a tuned silencer
The use of a tuned pipe type silencer may cause
the engine throttle response to be substantially
different from that with a normal mufer. Adjust
the needle (and pipe length) so that engine speed
changes are proportional to the throttle opening.
If the engine speed does not change linearly, the
governor will not perform satisfactorily with a
mufer or a pipe that does not allow the carbure-
tion to be linear.
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