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HelicopterMain Discussion › Tail servo drift
08-15-2010 06:06 PM  7 years agoPost 1
The Shadow

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Comfort, TX USA

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401gyro 9303 radioThe rudder servo will drift to full deflection without any comand. If I move trans stick to right an stop the rudder will continue to move to full right. Heard some where there was a trans input which would stop the unwanted movement. Any help?
Thanks

Fly safe, Play hard, Live long

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08-15-2010 06:23 PM  7 years agoPost 2
z11355

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New England

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often a sign that you are NOT powering up the bird w/ the gyro set for HH mode (this is a REQUIREMENT)

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08-15-2010 06:26 PM  7 years agoPost 3
The Shadow

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Comfort, TX USA

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Will do it in heding hold or not.

Fly safe, Play hard, Live long

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08-16-2010 03:45 PM  7 years agoPost 4
BarracudaHockey

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Jacksonville FL

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What is the light doing?

Rebind with the gyro switch in heading hold.

Any chance you're moving the helicopter while the gyro is booting? That can happen with smaller helis like 450's

Andy
AMA 77227
http://www.jaxrc.com

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08-16-2010 03:50 PM  7 years agoPost 5
Thatlumox

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NY

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If you touch the rudder stick before it's done "booting" it will drift to one side also.

"I'm a dirt torpedo!"

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08-16-2010 04:29 PM  7 years agoPost 6
JPhillips

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Waco, TX

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Also make sure there is no trim on the rudder channel. This will cause it to deflect to one side or the other as well.

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08-16-2010 04:37 PM  7 years agoPost 7
BarracudaHockey

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Jacksonville FL

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Actually it wont if its there when the gyro boots.

Andy
AMA 77227
http://www.jaxrc.com

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08-16-2010 05:01 PM  7 years agoPost 8
JPhillips

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Waco, TX

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Doesn't matter where the trim is or when's applied, HH gyros do not like trim. Hence the reason you set them up in rate mode and adjust until it has no drift.

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08-16-2010 08:14 PM  7 years agoPost 9
BarracudaHockey

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Jacksonville FL

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No need for that either, just center the slider and make sure the servo is 90 degrees.

Setup nuances aside, if there's trim or subtrim in there when a 401 boots it accepts that as center so thats not whats causing the drift.

Andy
AMA 77227
http://www.jaxrc.com

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08-16-2010 09:37 PM  7 years agoPost 10
JPhillips

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Waco, TX

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Center the slider?

I'm sure you know the tail rotors must have some amount of pitch, typically + - 7*, to compensate for torque. Don't tell me there's "no need for that either" when setting up a gyro, it's the only way to do it if you don't want the tail to blow out and cause disorientation and even a crash.

I've been doing it this way since my good friend BW told me and helped me do this and it's been perfect ever since.

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08-16-2010 09:54 PM  7 years agoPost 11
BarracudaHockey

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Jacksonville FL

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It may may perfect sense, it even works.

But you don't "have" to do it that way.

Your friend told you what works for him, don't assume thats the only way to do things.

As for the "torque", trust me I have a pretty good idea how it works

Andy
AMA 77227
http://www.jaxrc.com

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08-16-2010 10:07 PM  7 years agoPost 12
JPhillips

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Waco, TX

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My friend is Bobby Watts.

I know what ya meant and it certainly isn't the only way to set it up, to each his own.

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08-16-2010 11:03 PM  7 years agoPost 13
mustang67ford

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Central Pennsylvania

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Just went thru the same question and posted it here: https://rc.runryder.com/helicopter/t602058p1/

It on page 5 of this discussion forum. Lots of varying opinions. I can say that wherever the subtrims are set when you boot up the gyro is what it will see as center. Some will disagree but I have an email from futaba stating so and the instructions actually say the subtrims and be adjusted.

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08-17-2010 01:22 PM  7 years agoPost 14
BarracudaHockey

rrMaster

Jacksonville FL

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If ya wanna names friends.....

Anyhow...if you center the slider, on most models you do have some pitch, just depends on the design.

Andy
AMA 77227
http://www.jaxrc.com

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08-17-2010 05:07 PM  7 years agoPost 15
brandov2

rrApprentice

az

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I have flown the 401 for years.. And now the 520, I agree with Phillips and cuda actually.. It will work both ways, but the gyro performance on both is way better if you center everything and cancel drift mechanically (in non heading hold mode) Then its flawless in heading hold..
Just my 1.5 cents

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08-17-2010 05:12 PM  7 years agoPost 16
Swoop

rrElite Veteran

Newark, DE USA

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Ok, back to the OP question..

Are you getting correct rudder response in rate mode? Does the gyro switch between rate and HH? I'm wondering if you have the sense and rudder plugs backwards. Rudder to channel 4, sense to 5 or aux2.

What is the red light doing???

Chris
X50, B320, Radix, Spartan
Titan,Kasama,MP5,Radix,JR770
Trex450SE,MavrikkG5,Phoenix35

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HelicopterMain Discussion › Tail servo drift
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