User manual FUTABA GY520

[. . . ] INSTRUCTION MANUAL YAW-AXIS STABILIZER FOR MODEL HELICOPTER (RATE GYRO) 1M23N21902 520 Mnl. indd 1 4/7/2009 7:54:59 AM TABLE OF CONTENTS · Precautions ----------------------------------------------------- 3 · Warranty and Repair Service (in U. S. A. ) ------------------ 6 · Contents -------------------------------------------------------- 7 · Specifications -------------------------------------------------- 8 · Recommended Servos ---------------------------------------- 9 · Replacement and Optional Items --------------------------- 9 · Function and Connection Diagram ----------------------- 10 · LED Indicator Description----------------------------------11 · Introduction ---------------------------------------------------11 · Mechanics Preparation ------------------------------------- 12 · GY520 Installation ------------------------------------------ 13 · Connecting the GY520 to your Receiver ---------------- 15 · GY520 Programming --------------------------------------· Tail Rotor Servo Installation and Setup -----------------· Before Flight Checklist------------------------------------· Adjustments During the Test Flight ---------------------· Using Normal Mode ---------------------------------------· Setting the Gain --------------------------------------------16 25 28 29 30 31 Technical updates and additional programming examples can be found at: www. futaba-rc. com/faq 2 520 Mnl. indd 2 4/7/2009 7:54:59 AM 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 5-10 seconds to initialize when the power is turned on. Do not move the helicopter and do not move the tail rotor stick during this initialization or the gyro may not initialize properly. [. . . ] This can be used to set the centering position for the tail rotor linkage and the tail rotor stick can be moved to verify that the limits are set correctly. While in the servo limits parameter the tail rotor stick is 150% more effective to compensate for any tail rotor AFR or D/R adjustments made within the radio. Please do not be concerned if the tail rotor servo reaches its limit before the tail rotor stick reaches its physical limit. 20 520 Mnl. indd 20 4/7/2009 7:55:05 AM 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 next limit setting or exit the limit setting parameter. If the current value is greater than 50% then the LED will be blue and the setting is acceptable. Quickly press and release the button once to enter limit setting mode. The LED will flash quickly and the tail rotor servo will travel to the set limit. When the transmitter's tail rotor stick is moved to the left or to the right the servo limit will increase or decrease. Hold the tail rotor linkage over the linkage ball and adjust the servo limit using the tail rotor stick until no binding occurs. If the LED turns red, then the travel value is less than 50% and this is not acceptable. If the limit is acceptable the LED will momentarily change to Violet and the servo will travel to the opposite limit setting. Hold the tail rotor linkage over the linkage ball and adjust the servo limit using the tail rotor stick until no binding occurs. If the LED is flashing red then the travel value is less than 50% and this is not acceptable. Quickly press and release the button once to return to the SERVO LIMITS parameter. If the limit settings are accepted the LED will momentarily change to violet. You can now move the tail rotor stick again to verify that the settings are correct. If you need to adjust the settings again simply repeat the above procedure to adjust the servo limit settings. 21 520 Mnl. indd 21 4/7/2009 7:55:06 AM 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 sensor's Angular Velocity Sensing Range (+/- 800° per second). The gyro will then no longer control the pirouette rate or consistency. If you experiment with the ultra-fast pirouette rate, make sure that your flight battery and fuel tank are secure. Also be certain that your model's tail rotor drive train is up to the task. LED INDICATOR/MODE Blue, 4 Flashes F3C Flight Mode* Red, 4 Flashes 3D Flight Mode DESCRIPTION 450 deg/sec pirouette rate at 100% D/R Softer pirouette starts and stops. 720 deg/sec pirouette rate at 100% D/R Aggressive pirouette starts and stops. Always try the F3C flight mode first and if you determine that the gyro is not aggressive enough, then try the 3D flight mode. [. . . ] The tail rotor ratio, tail rotor pitch range and tail blade length play a large part in achieving optimum tail rotor performance. The gain value can vary drastically from model to model and the exact value should not play a part in the evaluation of the gyro's performance. How the gyro operates during flight is the only concern of ours. 29 520 Mnl. indd 29 4/7/2009 7:55:08 AM 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. [. . . ]