D60510
Thank you for buying a Futaba FP-G501 piezoelectric rate gyro.
The FP-G501 is used with model helicopters and fixed wing aircraft when wanting to suppress changes in the aircraft's attitude by changes in air currents, engine torque, etc.
The FP-G501 features a very fast response speed and high gyro sensitivity made possible by using a piezoelectric ceramic element as the angle sensor. In the past a rotating motion was used which resulted in a wide dynamic range that allowed constant control of the rotating speed which was much slower per-
•Minimizes changes in an aircraft's attitude by wind, etc.
The especially high frequency response of the piezoelectric gyro allows an increase in gyro sensitivity. The original ability of a gyro to suppress changes in an aircraft's attitude due to wind and engine torque changes and other unexpected phenomena has been increased substantially.
•Angular acceleration commands used.
To take advantage of the wide dynamic range of the piezoelectric gyro, angular acceleration commands are used. The transmitter stick operating angle becomes the aircraft command for angular acceleration and the aircraft rotating speed is proportional to the stick operating angle that is obtained while maintaining stabilization performance. This is the greatest merit of the piezoelectric rate gyro over conventional gyros. Fixed rotation of the aircraft can be commanded by the transmitter stick operating angle.
• Piezoelectric gyro drift cancellation.
Deviation of the gyro from the direction to be maintained (neutral) is called drift. When the power is turned on, the FP-G501 senses this drift and automatically compensates it during gyro operation. Therefore, do not move the aircraft for four to five seconds after turning on the power.
• FP-S9203 high response servo.
To take advantage of the excellent response of the FP-G501 and to extract the ultimate performance of the piezoelectric gyro, a FP-S9203 coreless servo has been designed for this purpose.
• Sensor vibrationproofing.
A special suspension is built into the gyro to vibration-proof the
formance. To obtain full performance from this rate gyro and also for safety, please read this manual before use. After reading this manual, please retain it for future use. Also read the instruction manual supplied with the digital proportional radio control set, model kit, and engine.
NOTE: The FP-G501 should be used with the FP-S9203 to obtain maxima performance. If used with another servo, the FP-G501 may not operate satisfactorily, or yield maximum performance.
CONTENTS
1.FEATURES
2.SET CONTENTS
3.MOUNTING AND CONNECTIONS
4.SENSITIVITY ADJUSTMENT
5.ADJUSTMENT PROCEDURE
6.USAGE PRECAUTIONS
7.RATINGS
8.REPAIR SERVICE
IMPORTANT:
For safe use, read the items indicated by the following caution mark especially carefully.
I ;Caution mark
"All, or part. of this manual may not be reproduced without prior permission. "The contents of this manual are subject to change without prior notice
"This manual has been carefully written, but if you find anything that you do not understand or that is incorrect, please contact Futaba.
"Futaba is not responsible for use of this gyro by the user. "Futaba" is a registered trade mark.
sensor element itself. The sensor is protected against unwanted vibrations around the sensor shaft while maintaining high response.
• Simple sensitivity adjustment.
High side and low side sensitivity can be easily adjusted from 0 to 100% each by means of control box trimmers.
The sensitivity can also be adjusted from the transmitter.
(Terminology)
Piezoelectric gyro
Whereas the conventional gyro uses a rotating body to sense angular acceleration, the piezoelectric gyro uses a piezoelectric ceramic element. When rotation angular acceleration is applied while the piezoelectric ceramic element is vibrating, force proportional to the rotation angular acceleration is generated in the direction perpendicular to the direction of vibration. The piezoelectric element isflexed bythisforceandthe angularacceleration is sensed by extracting the change of this vibration as an electric signal. The gyro is called a piezoelectric gyro because of this principle. An amplifier processes the sensed signal, togetherwith the control signal from the transmitter, and controls the servo.
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Single set |
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Set w/servo |
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Gyro |
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FP-G501 |
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Servo |
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FP-S9203 |
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Accessories |
Small screwdriver (for adjustment) |
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Double-sided tape (for gyro mounting) |
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Mounting examples
Mounting precautions
The amount of improvement of gyro performance has a considerable effect on the fuselage vibration level or the size, type, linkage method, looseness, etc. of the tail rotor.
The use of a tale rotor drive tube or other part with a high torsion performance for the tail drive is recommended. Since a higher gain than usual can be used then the tail rotor is more effective, the load on the tail is also greater. Therefore, take the strength of the tail into account during inspection and adjustment.
Gyro mounting
Mount the gyro so that it is on a straight line with the axis you want to stabilize as shown in the mounting example
In this case, stick thick double-sided tape (use the double-sided tape supplied with the gyro) to the entire bottom of the sensor so that unwanted vibrations of the fuselage are not directly transmitted to the sensor and the gyro is fastened firmly to the fuselage.
Control amp mounting
Wrap the control amp in sponge and mount it the same as the receiver.
Control box mounting
Modify the aircraft to match the mounting position hole and mount the control box, or fasten the control box to the aircraft with double-sided tape.
Mount the control box where vibration and exhaust are small.
CONNECTIONS
Gyro sensor
Control amp
Gyro output polarity switch
"When adjusting the linkage, always check the
polarity of the gyro output. If the polarity is opposite, switch it with the direction select switch.
Adjust low sensitivity with the "L" side sensitivity trimmer and high sensitivity with the "H" side sensitivity trimmer. When the direction of the sensitivity switch is opposite, set the direction using the reverse function for gyro channel. This is usually CH.5.
Servo
*Servo controlled by gyro.
To receiver rudder channel Connector A (black) (helicopter yaw axis stabilization)
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To receiver channel 5 |
Connector B (red) |
(sensitivity switching channel) |
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PRECAUTIONS WHEN TURNING ON THE RECEIVER POWER
Never move the aircraft for four or five seconds after turning on the gyro power (shared with receiver).
Since initialization is automatically performed inside the gyro immediately after the power is turned on, if the aircraft
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is moved at that time, the neutral position will change. In this case, turn on the power again.
At this time, the rudder servo (servo controlled by gyro) moves to the home position after the servos on the other channels, but this is normal.
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