FUTABA GV-1 Instruction Manual page 11

For safe operation, do not turn on the governor under the conditions
shown below. If satisfied while the governor is on, the following condi-
tions will forcibly turn the governor off.
When the governor is off, the transmitter throttle stick controls the
throttle servo.
-Engine started while governor switch in ON position.
-Engine speed is 70% or less of set speed and throttle stick is set to
20% or less from slow side after engine started (governor starting
only).
-Speed set to 999rpm or less (OFF setting).
-Stick signal is lower than stop position setting.
-Engine stopped, or sensor signal abnormal.
-Throttle stick set 15% or less from slow side (only when function
that turns governor on and off by stick is set).
The following operations do not indicate trouble:
(When engine speed rises above the set speed)
A near-vertical dive may cause the engine speed to rise above the
set speed.
(Throttle operation speed and ON/OFF point)
If throttle operation exceeds 70% of the set speed and the rotor
speed rises to the set value, the ON/OFF point may seem to differ
with the operating speed. Delay operation to smoothen the switch-
ing operation causes this and does not mean that the ON/OFF point
has changed.
(Deviation from set speed)
The GV-1 stabilizes the engine speed to within +1% of the set
speed. For example, if the rotor R.P.M. is set to1500rpm, the Rotor
R.P.M. speed will deviate about +15rpm. However, this poses no
problem from the standpoint of practical use.