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HelicopterMain Discussion › Spektrum DX6i and a futaba 401 gyro
05-10-2017 02:28 AM  4 months agoPost 1
Helimonster

rrNovice

La Vernia, Tx. USA

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Can anyone tell me if a Spektrum DX6i will work with a Futaba GY401 gyro. The gyro slow flashes and will not operate the tail servo, but the servo works fine thru the gyro.

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05-10-2017 03:14 AM  4 months agoPost 2
Dr.Ben

rrMaster

Richmond, VA, USA

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Are you saying the transmitter will operate the rudder? Slow flash indicates no rudder signal from the transmitter.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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05-10-2017 04:55 AM  4 months agoPost 3
dkshema

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Cedar Rapids, IA

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It should work fine. The 401 has three plugs. One goes to the servo and has three wires, and is the only one that will mate with your servo lead. The second three-wire plug goes into channel 4 of the receiver which is the rudder channel output. The third connector is red and has a single wire. This plugs into channel 5 of your receiver and will control the gyro gain and operating mode. This is controlled by the channel 5 output of your DX6i. That is part of your transmitter setup. It has been a long time since I programmed a DX6i, but if you need help I can probably dig up that info again.

When you plug the single wire gain lead into your RX, make sure that single wire plugs into the signal output pin of the RX. The signal wire of your other servos will usually be white, orange, or yellow, depending upon made the servo.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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05-10-2017 11:42 AM  4 months agoPost 4
Helimonster

rrNovice

La Vernia, Tx. USA

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Yes dkshema, all that hooking up of wires is right. And yes, the rudder is working with the slow flashing light. But when I pick up the heli and move the nose side to side, the gyro is not operating the servo.

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05-10-2017 12:50 PM  4 months agoPost 5
dkshema

rrMaster

Cedar Rapids, IA

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Then you have an initialization problem.

The GY401 must be powered up in Heading Hold mode. You apply power and let the heli sit still until the gyro completes its initialization sequence. When complete, the red LED on top will be ON. If it isn't, your transmitter is not set up to put the unit into heading hold mode. It is set for rate mode operation. You must fix that.

Once you get the TX programmed correctly, leave it set to select heading hold mode, then re-bind the receiver. This will insure that the receiver is driving the gyro in heading hold mode while the transmitter and receiver are establishing the RF link at power on

Then always power up in heading hold mode and let the heli sit still until the gyro is done with its power-up sequence.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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05-10-2017 01:08 PM  4 months agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

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These two pictures show what you need to do at your transmitter to get the gyro function to work:

In the second picture, you will see that you can set two different gains, one for each position of the switch.

In that menu, numbers between 0% and 50% will select RATE mode. Numbers between 50% and 100% will select HEADING HOLD mode.

The value 50% is essentially zero gain and the gyro won't be happy when you turn it on.

50 is zero gain, 100 is 100% gain, 75 is 50% gain, all heading hold mode.

50 is zero gain, 0 is 100% gain, 25 is 50% gain, all rate mode.

If you take a close look at the 401 manual, there is a small region surrounding 50 that is "no man's" land. Avoid settings close to 50 to avoid uncertainty as to how the gyro will boot up.

BTW - you get to the first two pictures above through this menu in your DX6i:

And here is a guide to decoding the LED action:

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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05-10-2017 02:31 PM  4 months agoPost 7
Pistol Pete

rrProfessor

Seffner, FL

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Good old 401

Tips:

http://www.futabarc.com/team/team-tip-002.html

~~Enjoying the hobby one flight at a time~~

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05-10-2017 04:21 PM  4 months agoPost 8
raholek

rrVeteran

Zachary, Louisiana

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Good Help.

Wow! I am gonna miss Runryder.

www.redstickrc.net ama#: 968515

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05-10-2017 10:21 PM  4 months agoPost 9
Helimonster

rrNovice

La Vernia, Tx. USA

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Thanks dkshema. I adjusted the rate from 50 to 68 on position 0 and the rate from 50 to 40 on position 1. The gyro light came on solid and now moving the nose side to side is working the servo. Thank you again very much. I am sure I will have to tweek these settings but at least the gyro is now working.

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