The GY gyro by Futaba is perhaps the most popular RC helicopter gyro ever. need the manual for the GY, you can grab that here. Manual GY – Robbe Futaba. Manual GY Be the first to rate this product. Recommend ยท Ask question. Description. Manual GY – Robbe Futaba. CopterX GY Digital Gyro user manual. Thank you for purchasing CopterX GY Gyro! High performance, light weight gyro with AVCS (Angular Vector.

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Check the blades, check for bent main shaft, spindle shaft, tail shaft, out of balance tail blades, etc. Do not disturb the trim in the radio. The cushioning is done inside the gyro.

If the servo moves to one direction but does not move back to center then you are in heading hold mode which is right. As you can see in the picture to the left, I mounted it with the cords coming out toward the back of the helicopter.

Without a doubt, the GY gyro with or servo is one of the best tail rotor stabilization systems produced to date. Check and double-check this point, because getting it backwards can cause needless excitement on a model’s first flight.

The Futaba GY had a built in Limit Trimmer adjustment so you can set the amount of tail rotor servo travel to avoid servo over travel and stress on the servo. Notice that the values are different, you do not need as much to rotate the helicopter to the left because it is going ‘with’ the torque in that direction. The tape works great, use it.

The “direction” DIP switch is set such that movement of the nose of the model to the left counter clockwise causes the gyro to supply a right tail rotor command to the servo. This will set how fast the helicopter rotates.

Futaba GY Gyro How-to

I also use a JR Ball link resizing tool to remove unecessary resistance from the ball links. If you are not using a stock tail slider then use the other technique. This adjustment only effects how fast the tail moves your pirouette rate. Again, watch the LED to confirm which mode the gyro is in before making adjustments.


Set the DIP switch on the gyro for manial servo, assuming the or is installed. This will make the nose of the helicopter rotate to the right. It should be solid in AVCS mode. Connect the one with 3 to the rudder channel of the receiver labeled ‘Rudd’. As mentioned, the GY supported both slower analog tail rotor servo pulse rates or can be switched to a Hz high frequency rate for gy4401 tail rotor specific digital servos. It avoids the use of any preprogrammed gyro software, because many months of following posts and questions on the various web forums has proven that those software menus sometimes produce more confusion than the set up about to be mnaual.

Once you get the link as free from resistance as you can. One side controls heading hold gain; the other side controls gyy401 gain. The instructions with most gyros say to use a much longer distance however I found it to work best at around 13mm. Do not disturb the rudder. A better choice for non computerized radios or if you are lacking a spare channel for remote gain would be the Futaba GY or the E-flite G90 for smaller helis.

Adjust the guides to acheive the least resistance. You cannot use this to prevent linkage binding. I have my tail servo mounted up front and I added a slight bend to the front section so the link is at the same height as the ball on the servo arm. Next check that the front link is centered with the ball on the servo arm. Also make sure yg401 trims are centered.

The helicopter model and engine must be running smoothly. For now set both to but later you may need to adjust this down a little to keep the gyro from ‘hunting’. The rudder input lead for the gyro is plugged into the rudder channel slot in the receiver. Proper trim can and should be obtained mechanically by adjusting the tail rotor pushrod.


Make certain left and right inputs are checked, because many helicopters have asymmetrical tail rotor pitch change mechanisms. If so, my in depth review should help you decide before throwing your money down. Also as with all heading hold gyros you have to wait for the gyro to initialize after power up before you can move the helicopter. Channel 5 works well in most Futaba receivers and transmitters. Observing the ATV screen in the radio for the gain select channel will allow the user to determine which is which.

Team Futaba Tip #2

Remember the gyro has to start up in HH Heading Hold mode. The GY works best with the or servos, period. It may or may not initialize manuall depending on where the position you have the GEAR switch remember this is now the switch that will control the gyro. Remember that a few hundred rpm drop on the head is several hundred rpm drop on the tail. If you the tail wags in a hover then decrease the gain. Once ideal trim is obtained, land the model. Also keep your tail shaft oiled.

Even the best conventional analog and digital servos that Futaba produces pale in comparison to the performance achieved when the gyro is paired with the or servo tail rotor servo. I leave mine in HH all the time. Use the ‘clear’ button to set the values to zero.

Manual GY401

On my gy that came with the servo I have found 84 is what it took. If it’s not, turn the link clockwise to move it toward the back or counter clockwise to move it forward.

Are you considering getting an Esky V2 micro heli? The tail rotor servo is plugged into the output lead from the gyro. The RPM’s should be to for 3D flight.

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