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What is a gyro? A gyroscope is an electronic unit that senses motion and corrects for it. For example, if the wind blows
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How does it help in helicopter setup? A good gyro will totally eliminate the need for revo. mixing. The gyro will sense and
correct the unwanted motion for you, so you don’t have to spend time to get a complex curve operating properly.
Gyro sensor types: There are many different kinds of gyros. Early gyros were mechanical, with a spinning drum similar
to a child’s gyroscopic toy. The next generation utilized a special type of crystal, called piezoelectric, which sensed the
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System) technology. These sensors, or computer chips, sense the motion. MEMS is far more accurate and less susceptible
to inaccuracies caused by temperature changes, etc.
Types of gyro responses:
• Normal: sense motion and dampen it (if the gyro rotates off course for 2 seconds, it corrects for 2 seconds).
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until the same rotation is achieved.
• Stick priority: a feature on most high-end gyros. The more input given on the channel the gyro controls, the less sensitive
the gain is automatically. This way, if you give a large input for a stall turn, for example, the gyro turns itself off and
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model straight. (If your gyro does not include stick priority, you can manually create it. Please see www.futaba-rc.com\
faq\.)
Choosing the right gyro for your skills, your helicopter, and your budget:
• Mechanical: some are still available. They are very challenging to set up and not as reliable as piezo or SMM.
• Non-Heading-Hold Piezo: these are now inexpensive gyros that are reliable and easy to set up. Some have dual rates and
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• Heading-Hold Piezo: Until recently, the cream of the crop. Expensive, and more complex to set up. Adds GPS-like
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• Heading-Hold SMM: 21st Century gyro technology. Computer chip technology. Expensive, easier set up, higher
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using specialized digital servos. Examples:
• GY401: Simpler set up. Ideal for learning aerobatics through 3D.
• GY502: Better centering than 401 for more advanced aerobatics. Ideal through Class III competition.
• GY611: Exceptional center. Extremely fast response time. Requires specialized servo.
• Heading-Hold MEMS: GY520 is the smallest and lightest heading hold AVCS gyro available today. Its cutting-edge
MEMS (Micro Electro Mechanical System) sensor design, ultra high-speed processing speed and advanced PID control
algorithm put it a quantum leap ahead of all other heading hold gyros in size, weight and performance. The GY520 has
been optimized to work with small electric models and larger nitro (.30 through .91) sized helicopters.
GYRO
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gain, the more correction the gyro provides and the “softer” or less responsive the helicopter feels.) This function makes
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Adjustability:
• Plug the gyro’s sensitivity adjustment to channel 5 of the receiver. (not assignable)
•
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• Full switch assignability or may select
Cond.
option.
•
Cond.
option provides separate gyro settings, one for each condition, automatically selected with the condition. Allows
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• Each gyro setting may be set from 0 to +100 (
NOR
100% to
AVC
100%) gain, equating to ATV settings of -100% to +100%.
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Negative settings trigger normal mode; positive settings are AVCS mode.
• Larger percentages indicate more gain, or gyro responsiveness.
• Tail wagging or shaking indicates excessive gain settings. Turn down gyro setting until wag stops.
