Futaba 6J 2.4GHz - Manual (Page 82)

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‡ Gain
Gyro sensitivity. When too low, the tail will not hold position well. When too high, the surface being
dampened by the gyro will tend to wag, or hunt for center.
‡ Glitch
Momentary radio problem that never happens unless you are over trees or a swamp.
‡ Glow Plug
The heat source for igniting the fuel/air mixture in the engine. When starting the engine a battery is used to
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‡ Grease-in
A very smooth, gentle landing without a hint of a bounce.
‡ Gyro
A gyro is an electro-mechanical, or electronic device which aids in the control of an R/C model.
The gyro senses motion in one axis, and directs the servo to counter that motion. The sensor, which
can be a mechanical gyroscope, or an electronic piezo crystal, detects unwanted movement. The
gyro then instructs the servo to counter for that motion. At all times, the radio commands will
override the gyro command. The level of control the gyro had is adjusted by the GAIN setting.
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Piezo Gyro: uses a piezo crystal to sense movement.
Non-Heading-hold vs. heading hold: A standard (nonHH) gyro senses movement and makes an effort
to counter that movement as long as it feels it. Therefore, it is NOT going to return the model to the
exact heading prior to the movement. Heading Hold (or AVCS) gyros will lock the model into one
position, and accurately correct for movement by sensing rate of change and returning at that same rate.
SMM technology: utilizes a microchip to sense movement and provide all readings. Experiences minimal
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mechanical gyros.
‡ Gyro sensitivity
Used to create stick priority or activate each rate of a dual rate gyro based on stick position. This
preprogrammed mix decreases the gain of the gyro directly proportional to the amount of rudder stick given
(or steps the gyro down from high to low rate on dual rate gyros.)
‡ Heading Hold
This describes a type of Gyro which senses rotation, and maintains direction. This is accomplished by
sensing the rate of motion, and the time of motion, then compensating for the distance. While this sounds
complicated, the effect is that if you have the model dialed in, and point the nose north, with a heading hold
gyro on the yaw axis the model will continue to face north until you command it to yaw. See also Heading
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command to turn the model. Often used for ground use only for perfect take off and landing runs.