dkshema
rrMaster
Location: Cedar Rapids, IA
My Posts This: Topic Forum | That gyro is a poor counterfeit of the Futaba GY401. The manual
http://www.heliguy.com/i/gy400.pdf is also pretty much a cut-and-paste job from the Futaba GY401 manual. So much of a cut-and-paste that they tell you to write to Futaba if you find the manual in error, or if you have questions:
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Reading reviews of this gyro on the web indicates that the best use for this gyro is as filler in the local garbage dump.
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But, if you must use it, the gyro has three leads.
One three-wire plug that goes into channel 4 of your receiver.
One one-wire plug that goes into channel 5 of your receiver.
One three-wire plug that goes to the rudder servo.
You'll use the channel 5 switch on your Transmitter to control the gain (I hope your transmitter has a switch for channel 5, it's usually the retractable landing gear switch).
One position will select heading hold mode for the gyro. At power-up the red LED on the gyro will come on and stay on after initialization if you started it up in HH mode (and that is a requirement to do so).
The other position of the switch will select normal/rate mode. You must NOT initialize the gyro in normal mode, if you do, it won't be happy and won't work well. (In the case of the Colco GY400, not working well seems to be a way of life).
Start up in HH mode, then switch to normal mode. The servo should follow the sticks and return to neutral in rate mode. Set the LIMIT adjustment to 100% on the gyro. Adjust the distance of the ball link on the TR servo to the center of the TR servo shaft so that with the gyro LIMIT set to 100%, you get AT LEAST +/- 45 degrees of servo movement for full side to side stick deflection, without binding the tail rotor pitch slider mechanism. Mount the ball link at that distance from center. Fine tune the LIMIT setting so that you don't bind the servo/pitch slider at full left or right stick.
Remember to always start the gyro up in HH mode. Once initialized in HH mode, you can use the gear channel switch to go back and forth between HH and normal/rate mode. Do NOT move the rudder trim tab on the TX after the gyro is initialized in HH mode. To do so will confuse it, and it won't work well.
If you're using the gear channel in your TX, one position will set the gain for HH mode, the other position will set the gain for normal/rate mode.
Make sure you have the rudder channel direction in the transmitter set correctly for your heli, and that you have the gyro direction on the gyro body set correclty before flying. BOTH must be set to control in the proper direction for you to have success.
This ought to get you going. If you need additional help, ask.
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* Making the World a Better Place -- One Helicopter at a time! *
Dave |
