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Advantage Hobby . Revolution Models . CarbonXtreme

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Radio - JR & Spektrum DSM > jr 770 gyro drift pronlem
 
 
lando211
New Heliman
Location: flowery branch GA

My Posts This: Topic  Forum		Hello all I have a fury 60 with a jr 770 8700 combo on the bird and can not get the drift to stop. any out there that can help? I can get the heli to do good in rate mode and not really even drift. Then in hold if I give right or left it will stop then one sec later it will drift nose left every time. I even put the gain up high and got tail wag but it still would drift. HELP! The gyro works good for rolls and loops but thats all I will try with it like this.
10-05-2009 04:25 PM
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BarracudaHockey
rrMaster
Location: Orange Park FL

My Posts This: Topic  Forum		Turn the gain all the way up.

Adjust the sub trim till the rudder servo stops moving in heading hold mode, go slow, one point at a time, you should probably need less than 10 points of sub trim.

Turn the gain back down and test fly.

Also, excessive vibration and poor mounting can cause gyro drift, for the JR gyros though, try the above step first.


AMA 77227
http://www.jaxrc.com
10-05-2009 04:35 PM
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MartyH
Elite Veteran
Location: Cincinnati

My Posts This: Topic  Forum		before you start clicking subtrim, recheck your mechanical linkage and remember to bias the center point with the pitch of the tail blades so they're generating a little anti-torque. You might need one more turn of your linkage.

Marty,
Raptor 90 3D, Freya and more
10-05-2009 04:37 PM
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BarracudaHockey
rrMaster
Location: Orange Park FL

My Posts This: Topic  Forum		If the servo drifts on the bench, then you need to correct it out with sub trim before you do anything else.


AMA 77227
http://www.jaxrc.com
10-05-2009 04:41 PM
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Jlerch
Senior Heliman
Location: Parrish, Florida

My Posts This: Topic  Forum		Make sure the gyro gain channel is (or is not) reversed. Trouble shooting heading hold drift while in rate mode is a PITA! :-)

Also, power up the heli Rx with the Tx off. Observe the Gyro, does it initialize? Once the Rx is power up, and you've observed the gyro, turn on the Tx and watch what happens. If the Gyro starts to drift once linked with the Tx, you need to reset your power on default servo position in the Rx..

Finally, you might want to make sure that your rudder trim is common for all flight modes.

James Lerch - ManateeRC Member - Blade 400 - Raptor 60 - Lots of sim time
10-05-2009 05:16 PM
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Swoop
Key Veteran
Location: Newark, DE USA

My Posts This: Topic  Forum		If all the normal fixes don't work, have a look here:
http://runryder.com/helicopter/t523727p1/

could be completely unrelated but you never know. I also found out the bearings were on their way out in the Hyper, so that could have been causing vibrations that took their toll on the gyro.

Chris
Titan,Kasama,MP5,Radix
Trex450SE,MavrikkG5,Phoenix35
10-05-2009 05:49 PM
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lando211
New Heliman
Location: flowery branch GA

My Posts This: Topic  Forum		ok lets start over I had a jr 550 gyro on it first and wanted to upgrade when I did I noticed I could not get my servo to center like it did before. I moved to horn every whick way and still could not get it to 90 degree. so I wonder if thats it? Also if I was to go by the manual I have no trim or sub trim per manual. I have used double the tape. and it still drifts just a bit. I will try some of the things you guys have said.
10-05-2009 06:24 PM
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BarracudaHockey
rrMaster
Location: Orange Park FL

My Posts This: Topic  Forum		Question is, does it drift on the bench in heading hold?


AMA 77227
http://www.jaxrc.com
10-05-2009 07:31 PM
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MartyH
Elite Veteran
Location: Cincinnati

My Posts This: Topic  Forum		I think he's saying the heli is drifting in flight, not that the servo is drifting on the bench. But, lets start there. Turn the heli on sitting on the bench (with transmitter on of course) and watch the servo or the tail blades to see if it slowly drifts.

Marty,
Raptor 90 3D, Freya and more
10-05-2009 07:53 PM
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BarracudaHockey
rrMaster
Location: Orange Park FL

My Posts This: Topic  Forum		I agree but like you said, I would start with zeroing the drift on the bench if there is any.


AMA 77227
http://www.jaxrc.com
10-05-2009 07:56 PM
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lando211
New Heliman
Location: flowery branch GA

My Posts This: Topic  Forum		I will look tonight to see if it drifts on the bench.
10-05-2009 09:15 PM
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SteveH
rrProfessor
Location: Texas

My Posts This: Topic  Forum		BarracudaHockey is right...with the JR 7703D, and the 500T also (maybe other JRs) you MUST stop the drift on the bench with subtrim first. If you don't, you will NEVER get the drift out of it. They DO NOT work like Futaba gyros.

SteveH
Magnum Fuel
AMA76186
10-05-2009 09:43 PM
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SteveH
rrProfessor
Location: Texas

My Posts This: Topic  Forum		BarracudaHockey is right...with the JR 7703D, and the 500T also (maybe other JRs) you MUST stop the drift on the bench with subtrim first. If you don't, you will NEVER get the drift out of it. They DO NOT work like Futaba gyros. If you don't believe us, read the instructions.

SteveH
Magnum Fuel
AMA76186
10-05-2009 09:44 PM
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lando211
New Heliman
Location: flowery branch GA

My Posts This: Topic  Forum		ok no drift on the bench in rate or HH
10-06-2009 12:22 AM
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FlyingHigh450
Elite Veteran
Location: Macomb,Mi

My Posts This: Topic  Forum		Did you center the tail in rate mode while hovering?The manual don't tell you to but you have to set the tail up in rate mode while in a hover.

Trex 600N/hyper 50/MP5, Revmax,Spartan DS760/JR DS8900G,3 Align DS610's.
10-06-2009 01:21 AM
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lando211
New Heliman
Location: flowery branch GA

My Posts This: Topic  Forum		yes I did what I would do with a 401 set the bird in rate mode got her good and then hit HH and she drifts I dont get it
10-06-2009 02:38 AM
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FlyingHigh450
Elite Veteran
Location: Macomb,Mi

My Posts This: Topic  Forum		Try a set of longer tail blades..

Trex 600N/hyper 50/MP5, Revmax,Spartan DS760/JR DS8900G,3 Align DS610's.
10-06-2009 07:06 AM
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BarracudaHockey
rrMaster
Location: Orange Park FL

My Posts This: Topic  Forum		Ok, no drift on the bench.

How much gain are you running?
How long is your servo arm?


AMA 77227
http://www.jaxrc.com
10-06-2009 04:37 PM
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nivlek
rrProfessor
Location: Norfolk England

My Posts This: Topic  Forum
Quote 
yes I did what I would do with a 401 set the bird in rate mode got her good and then hit HH and she drifts I dont get it

Forget about how you set up a 401 , it's different !

At the end of the day , it gets dark .
10-06-2009 05:18 PM
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FlyingHigh450
Elite Veteran
Location: Macomb,Mi

My Posts This: Topic  Forum

Trex 600N/hyper 50/MP5, Revmax,Spartan DS760/JR DS8900G,3 Align DS610's.
10-06-2009 06:54 PM
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Radio - JR & Spektrum DSM > jr 770 gyro drift pronlem
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