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foxkilo · 09-15-2009, 10:01 AM

I have this pre-owned King 2 that was set up with the tail/rudder servo arm pointing downwards when centered (on the stock King 2, this servo arm points up when centered). It came with a Futaba 6EXHP TX where the Rudder channel (4) was selected to "Reversed" - in order for the tail rotor pitch to function in the correct sense.

I've recently switched to a Futaba 9CHP (FF9) and programmed it to operate with the King 2. Surprisingly, the stock rate gyro is unable to initialize (red LED keeps on blinking) with the Channel 4 in "Reverse". It will only do so when Channel 4 is switched to "Normal", but then the tail rotor pitch is reversed!!!

Of course, the obvious solution is to re-mount the tail servo arm following the stock config, but why should I do that when it worked fine previously?

I can't figure out what's wrong here, and hope some King 2 'gurus' out there can shed some light... By the way, the rate gyro switch is set to "Normal" and it is compensating the yaw motion correctly... Channel 4 is Reversed, zero sub-trim and trim.

foxkilo · 09-15-2009, 10:27 AM

Ooppps!!! Problem solved... turns out that Channel 4 signal was not perfectly centered although the rudder stick was dead center. Trimmed out this discrepancy and now everything works

Rate gyro initialized!!

Learned something new...

3DFlyer-1 · 09-15-2009, 10:29 AM

Have you checked the servo mix menu on your TX? You may need to set the servo to a negative value as opposed to just reversing the servo. Just a thought here.

*EDIT* Okay, glad to see you figured it out. Thanks for sharing the solution.

Cheers.

foxkilo · 09-20-2009, 05:28 AM

Still got one problem to figure out... I'm using a rate gyro and hence, have to set Revo Mix... The Futaba 9C has 5 points for Revo Mix curve, defaulting to -20 (low), -10, 0, 10, 20 (high).

How do i know this default is okay to use? What should i do to determine the correct values? If the heli's nose tends to rotate to one side, how would i know if this is a problem with the tail/gyro setup, or due to unsuitable revo mix settings?

09-15-2009, 10:01 AM	#1 (permalink)
foxkilo Registered Users Join Date: Dec 2008	Rate gyro refuses to initialize... I have this pre-owned King 2 that was set up with the tail/rudder servo arm pointing downwards when centered (on the stock King 2, this servo arm points up when centered). It came with a Futaba 6EXHP TX where the Rudder channel (4) was selected to "Reversed" - in order for the tail rotor pitch to function in the correct sense. I've recently switched to a Futaba 9CHP (FF9) and programmed it to operate with the King 2. Surprisingly, the stock rate gyro is unable to initialize (red LED keeps on blinking) with the Channel 4 in "Reverse". It will only do so when Channel 4 is switched to "Normal", but then the tail rotor pitch is reversed!!! Of course, the obvious solution is to re-mount the tail servo arm following the stock config, but why should I do that when it worked fine previously? I can't figure out what's wrong here, and hope some King 2 'gurus' out there can shed some light... By the way, the rate gyro switch is set to "Normal" and it is compensating the yaw motion correctly... Channel 4 is Reversed, zero sub-trim and trim.

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09-15-2009, 10:27 AM	#2 (permalink)
foxkilo Registered Users Thread Starter Join Date: Dec 2008	Ooppps!!! Problem solved... turns out that Channel 4 signal was not perfectly centered although the rudder stick was dead center. Trimmed out this discrepancy and now everything works Rate gyro initialized!! Learned something new...

09-15-2009, 10:29 AM	#3 (permalink)
3DFlyer-1 Registered Users Join Date: Mar 2009	Have you checked the servo mix menu on your TX? You may need to set the servo to a negative value as opposed to just reversing the servo. Just a thought here. EDIT Okay, glad to see you figured it out. Thanks for sharing the solution. Cheers.

09-20-2009, 05:28 AM	#4 (permalink)
foxkilo Registered Users Thread Starter Join Date: Dec 2008	Still got one problem to figure out... I'm using a rate gyro and hence, have to set Revo Mix... The Futaba 9C has 5 points for Revo Mix curve, defaulting to -20 (low), -10, 0, 10, 20 (high). How do i know this default is okay to use? What should i do to determine the correct values? If the heli's nose tends to rotate to one side, how would i know if this is a problem with the tail/gyro setup, or due to unsuitable revo mix settings?

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