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GY 401 and Tail wagging

le fou

Senior Heliman

Utah

Hello,

I have a raptor 30 V1.0. I used to have a Telebie gyro on it but I upgraded to a Futaba GY401 and 9254 servo. I used the tape supplied with the Futaba gyro to mount it. The problem is that I observe tail wagging now. It does not matter at what gain the gyro is set on. I even moved the linkage one hole closer to the center of the servo arm to reduce the sensibility. I could not stop the wagging.
I used the CSM mounting tape with my Telebie gyro and i did not experience tail wagging. Should I use SCM mounting tape with my Futaba gyro? Any ideas of what I should do?

Thanks,

Le fou

04-17-2005 Over year old.
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GY 401 and Tail wagging

TMoore

rrMaster

Cookeville, TN

Are you sure you have the gain channel plugged into the appropriate channel on your radio? Please make sure that the gain changes when you adjust it.

Lose the stock tape. It's a crash waiting to happen.
TM

04-17-2005 Over year old.
HOMEPAGE  
nogodznomasterz

Senior Heliman

Minnetonka MN

and that is defined by whether or not it will indeed toggle between normal and heading hold?

04-17-2005 Over year old.
HOMEPAGE  
dkshema

rrMaster

Cedar Rapids, IA

Make sure that you power the gyro up in HH mode (AVCS in Futaba speak). Otherwise, your gyro won't work right.

Sensitivity control channel settings in your gain control channel between 0 and 50% put the gyro in Normal mode (rate mode). 0 gives you 100% sensitivity, 50 gives you 0% sensitivity. Sensitivity control channel settings between 50 and 100 put you in HH (AVCS) mode. 50 on the control channel is 0% sensitivity, 100 on the control channel is 100% sensitivity, HH mode.

Dave

04-17-2005 Over year old.
barracudahockey

rrMaster

Jacksonville FL

Go through this set up, I'll be surprised if it doesnt solve your problem.
Andy

http://www.futaba-rc.com/team/team-tip-002.html

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

04-17-2005 Over year old.
mario.fernal

Heliman

Brazil

Be sure DS is on !

Little switch on the gyro.

Ion-X Baby !!!

04-19-2005 Over year old.
ints

Heliman

Estonia, Europe (EU)

I had the similar problem with Ergo 50 Type2 (GY401).

I think, "lightening up" my tail linkage mechanical setup was the key issue here. I.e., too tight setup worked well with old CSM 360 gyro, but not with GY401 or CSM560SL any more.

So, are you absolutely sure to have super-lightwieght mechanical setup on tail pitch slider, ball links etc.etc. ?

Also, it seems that some _small_ wagging (actually way slower, compared to too high rated gain) is sometimes normal for this type of sensor, or at last for this gyro. If you get used to it, it is not problematic any more ;-) If I remember correctly, also finding correct throttle/pitch curves & head speed helped here a littlebit as a finetuning measure. So, sometimes I notice to lean engine now from this characteristical wagging of tail :-) I dont think, my heli has some vibrations normally, but of course theoretically they can be caused from some sort of resonace or similar too...

Actually, I still have similar problem with my Hornet CP. Just not enought time to lighten up tail linkage, but anything else so far has no helped. I have tryed even German ACT mini-HH-gyro, that btw. uses the same sensor, but is only 4gr light!

Regards,
I.

04-20-2005 Over year old.
HOMEPAGE  
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Radio - Servo - Gyro - Gov - Batt

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GY 401 and Tail wagging

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