Futaba GY520 User's Guide
Summary
Enhance your model helicopter's performance with this high-accuracy yaw-axis stabilizer rate gyro. This comprehensive manual is essential reading for advanced RC hobbyists who require precise flight control and stable tail rotor operation. It provides expert guidance covering initial setup, hardware installation, detailed programming instructions (including Normal Mode and AVCS), operational safety checklists, and professional gain adjustments. Ensure peak stability and reliable handling for your model build with this detailed resource.
Page 1 Text Content
INSTRUCTION MANUAL
YAW-AXIS STABILIZER FOR MODEL HELICOPTER
(RATE GYRO)
Y520 Mnl.indd 1 4/7/2009 7:54:59 AM
Page Summary Contents For Futaba GY520 User's Guide
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INSTRUCTION MANUAL YAW-AXIS STABILIZER FOR MODEL HELICOPTER (RATE GYRO) Y520 Mnl.indd 1 4/7/2009 7:54:59 AM
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TABLE OF CONTENTS • Precautions ----------------------------------------------------- • Warranty and Repair Service (in U.S.A.) ------------------ • Contents ------------------------------------------...
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PRECAUTIONS WARNING! Failure to follow these safety precautions may result in severe injury to yourself and others. • Read through the entire manual before operating this product. • The GY520 requires...
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PRECAUTIONS • Only use the GY520 with a 2.4GHz system such as the Futaba FASST™ system, or a PCM system. Use with a FM system is strongly discouraged since interference can cause serious operational p...
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PRECAUTIONS • When operating the gyro in AVCS Mode, all tail rotor compensation and revolution mixing must be disabled and any tail rotor offsets for fl ight modes must be disabled. • When the GY520 i...
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WARRANTY & REPAIR SERVICE (IN U.S.A.) If any diffi culties are encountered while setting up or operating your GY520, please consult the instruction manual fi rst. For further assistance you may al...
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CONTENTS Mounting Pads GY520 Gyro 2mm Thick (two) 3mm Thick (two) Adjustment Screwdriver Damping and Shield Plate Extensions Tail Rotor Extension (Black) Gain Extension (Red) Y520 Mnl.indd 7 4/7/2009 ...
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SPECIFICATIONS Width: 0.79in [20mm] Length: 0.79in [20mm] Height: 0.39in [10mm] Weight: 0.243oz [6.9g] Maximum* Operating Voltage: 3.8V to 6.0V DC (Gyro only) Current Drain: 40m A (Gyro only) Selectab...
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RECOMMENDED SERVOS 250 – 450 Sized Electric Futaba S9257 EP Heli Digital (280Hz/1520μS): FUTM0667 .30 – .91 Size Helicopters Futaba S9254 Digital Servo Heli (280Hz/1520μS): FUTM0224 Futaba S9256 Digit...
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FUNCTIONS & CONNECTIONS LED Indicator Button Gain Tail Rotor Channel Channel Tail Rotor Servo Y520 Mnl.indd 10 4/7/2009 7:55:02 AM
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LED INDICATOR DESCRIPTION Slow Flash: 1/2 Second or longer Fast Flash: 1/4 Second or shorter CONDITION LED INDICATOR DESCRIPTION Initialization Slow Red Flash No Receiver Pulse or Sensor Error Slow Bl...
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MECHANICS PREPARATIONS WARNING! • Newer high end servos and other radio equipment are capable of placing large demands on the power systems in use today. When using a regulator you must ensure that th...
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GY520 INSTALLATION The gyro should be mounted on a rigid platform, at least 6in [152mm] away from a Nitro Engine. It is not necessary to mount the gyro near the main shaft of the helicopter but it is ...
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GY520 INSTALLATION Recommended Installation for Larger Electric Helicopters and All Nitro Helicopters Damping and 2mm or 3mm Shield Plate Mounting Pads Gyro Mount On smaller electric helicopters it is...
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CONNECTING THE GY520 TO YOUR RECEIVER Black: Tail Rotor Red: Gain Tail Rotor Servo Channel Channel Connect the supplied extensions to the GY520 connecter block as indicated. Route the wires through th...
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GY520 PROGRAMMING Button Entering Programming Mode Press and hold the button on the side of the GY520. After 3 seconds the LED indicator will momentarily change to violet. Release the button and the g...
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GY520 PROGRAMMING GY520 Parameters and Settings Table PARAMETER SETTING LED INDICATION Digital 1520μS Servo* Blue, 1 Flash 1. Servo Selection Digital 760μS Servo Red, 1 Flash Analog Servo Violet, 1 Fl...
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GY520 PROGRAMMING Parameter 1: Servo Type [1 FLASH] Select the appropriate setting for the servo you are using. LED INDICATOR SERVO TYPE SERVO COMPATIBILITY Futaba S9650 EP Heli Digital Servo Futaba S...
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GY520 PROGRAMMING Parameter 2: Gyro Compensation Direction [2 FLASHES] LED INDICATOR DESCRIPTION Red, 2 Flashes Normal Compensation* Blue, 2 Flashes Reverse Compensation * Default Setting WARNING! Ver...
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GY520 PROGRAMMING Parameter 3: Servo Limits [3 FLASHES] LED INDICATOR DESCRIPTION Red, 3 Flashes Limit Testing Mode Blue, 3 Flashes Set limit using tail rotor stick. The Servo Limit parameter is used ...
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GY520 PROGRAMMING WARNING! If one of the servo limits is set to a position less than 50% of the total throw, the LED on the gyro will turn red. When the LED is red, you will not be able to move to the...
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GY520 PROGRAMMING Parameter 4: Flight Mode [4 FLASHES] WARNING! Always make small (1%) adjustments to the tail rotor D/R or EPA once the value exceeds 100%. Over 100%, it is possible to exceed the sen...
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GY520 PROGRAMMING Parameter 5: Gyro Response Rate [5 FLASHES] LED INDICATOR DESCRIPTION Blue, 5 Flashes Standard Response* Red, 5 Flashes Fast Response Violet, 5 Flashes Slow Response * Default Settin...
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GY520 PROGRAMMING Parameter 6: Data Reset [6 FLASHES] Restores the gyro to the factory default settings. It will be necessary to reprogram all parameters again before fl ying the model. PARAMETER DEFA...
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TAIL ROTOR SERVO INSTALLATION AND SETUP Following your transmitter instructions, program your transmitter as follows: ❏ Enable the gyro function within the transmitter. ❏ Set the gyro mode to AVCS (GY...
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TAIL ROTOR SERVO INSTALLATION AND SETUP ❏ Install the tail rotor servo into the mechanics and connect the servo to the gyro. Remove the servo arm screw from the servo. Turn the receiver power on and a...
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TAIL ROTOR SERVO INSTALLATION AND SETUP Smaller Electric Helis (250, 300, 450 and 500) 13.5mm 7.5mm Larger Electric and All Nitro Helis ❏ Follow the instructions within the GY520 programming section a...
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BEFORE FLIGHT CHECKLIST ❏ Transmitter and Receiver batteries are fully charged. ❏ The gyro mounting pads are in good condition. ❏ The gyro wiring has some slack in it and all wires are clear of the ma...
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ADJUSTMENTS DURING THE TEST FLIGHT WARNING! Always make small (1%) adjustments to the tail rotor D/R or EPA once the value exceeds 100%. Over 100%, it is possible to exceed the sensor’s Angular Veloci...
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USING GY520 NORMAL MODE Most pilots today are using AVCS Mode. If you are just starting out, it is recommended that you use AVCS Mode exclusively from the start. Normal Mode is rarely used today due t...
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SETTING THE GAIN Most modern computer transmitters will have a gyro function built into them. If this is the case, please refer to your transmitter’s instruction manual. Most modern gyro functions wil...
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Entire Contents Copyright © 2009 Y520 Mnl.indd 32 4/7/2009 7:55:08 AM
Manual Details
| Brand | Futaba |
|---|---|
| Pages | 32 |
| File Size | 1.30 MB |
| Published | May 21, 2026 |
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Frequently Asked Questions
How long does the GY520 take to initialize?
The unit requires 5-10 seconds to initialize when power is turned on; do not move the helicopter or tail rotor stick during this time.
What are essential pre-flight checks for safe operation?
Verify battery voltage, check that the gyro compensates in the correct direction, and ensure wires are free of contact with the frame.
Which radio system is recommended for use with the GY520?
Use only a 2.4GHz system (like Futaba FASST) or PCM system, as FM systems are strongly discouraged due to interference.
How do I reset the center position when switching modes?
To memorize the new center position, simply flip the gain switch on the transmitter three times between Normal Mode and AVCS Mode within one second.