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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › TG7000 gyro. Strange hunting/wandering behavior in hover. Woo hoooo - A Break in the case!
01-17-2009 09:18 PM  9 years agoPost 1
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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So I have a TG7000 gyro on my Trex 500 with a 9257 servo. I can not get this thing to sit solid in the air in a hover. It is not wagging, it is hunting back and forth. It is not drifting either. The nose will sorta turn a bit one way, then turn the other.

The mechanical setup is correct, and I adjusted the limits correctly. I set the heli up in normal gyro mode, and adjusted the tail rod length accordingly to eliminate drift. (On a side note, I did try setting it up with zero tail blade pitch, but it drifted bad to the left in HH mode).

So, I am adjusting the gain in Trvl Adjust menu. With a gain of 50 it was wagging.

With a gain of 45 it would not wag in a hover, but it would "jitter" doing a right piro (but not to the left).

So I set it to 40. In FFF it felt fine in a straight line, but in a fast banked right turn, it would still jitter. I am going to have to reduce the gain for the next flight to hopefully get rid of this jitter.

It still did do the hunting thing at a gain of 40. We have also set the gain to 30, and that didn't help.

So what the heck? What the heck is this strange wandering or hunting thing it is doing? I want this damn thing to look like it is sitting on a table when it is hovering in the air!

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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01-17-2009 10:07 PM  9 years agoPost 2
airboss

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OC ,california

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vibration , redo the foam tape and add the metal plate if not installed. also engine tuning could be causing the vibes.add more foam tape.

Urukay HPS3 KSE 700 HPS3

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01-17-2009 10:24 PM  9 years agoPost 3
fenderstrat

rrProfessor

Aston,Pa

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also engine tuning could be causing the vibes.
seems to me you are running too rich,lean that motor out a bit

this may seem basic but did you disconnect the tail pushrod at the servo and make sure there is no binding

Compass helis Support Team
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01-17-2009 10:27 PM  9 years agoPost 4
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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It's a Trex 500. Its electric.

I used the metal plate. I have tried the foam tape that came with it, and I have also tried using the green backed Scotch 3M foam tape. Same results.

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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01-17-2009 10:29 PM  9 years agoPost 5
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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seems to me you are running too rich,lean that motor out a bit
Heck dude - there's no smoke at all, so I'm thinking it's lean enough!

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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01-17-2009 10:32 PM  9 years agoPost 6
fenderstrat

rrProfessor

Aston,Pa

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ok so you have it tuned properly

when you set the gain to 30 it didn't go away,so seems like gain may not be the issue,I'm not very familliar with that gyro but is it set for a 9257?I'm just throwing things out,sometimes its the simple things, as it seems you have the mechanical set up done right

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01-18-2009 01:20 AM  9 years agoPost 7
TMoore

rrMaster

Cookeville, TN

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Is the gain setting through the gear channel, aux channel or the gyro menu?

Every indication is that it is a vibration issue and on my machine that has the TG7000 I use the 3M 4408 tape with no plate under the gyro.

Is there any possibility that we might see a photo of the mounting position?

TM

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01-18-2009 02:13 AM  9 years agoPost 8
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Gain setting is through the Trvl Adjust gear channel on a 9303 2.4.

At first I used the foam pads and the plate that came with the gyro. Then I tried the Scotch 3M mounting squares with the green checkered backing. I'm still using the plate between 2 of the mounting squares.

TMoore

Why did you not use the steel plate? Did you have some issues, and your current configuration fixed them?

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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01-18-2009 02:17 AM  9 years agoPost 9
TMoore

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Cookeville, TN

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The plate is not necessary with plastic framed helis.

TM

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01-18-2009 02:26 AM  9 years agoPost 10
Mike0251

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Hills of the Blue Ridge VA

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By using it you add one more layer of tape and more dampening. Or add 2 more layers of tape instead. Main shaft true as well as tail shaft? Hold old is the gyro?

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01-18-2009 02:59 AM  9 years agoPost 11
white chocolate

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Baltimore, Md.

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Just curious what radio are you using?

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01-18-2009 03:00 AM  9 years agoPost 12
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Brand new everything.

9303 2.4 TX.

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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01-18-2009 03:56 AM  9 years agoPost 13
TMoore

rrMaster

Cookeville, TN

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In the last 5 years I have only used a metal plate on a gyro in one installation and I have a bevy of 601/611/Spartan gyros in my current fleet.

Something else is causing these issues. Rock, have you done the usual diligence, checking the pushrod for nice fluid movement, blade grips, swapped tail blades, etc.?

TM

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01-18-2009 04:17 AM  9 years agoPost 14
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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have you done the usual diligence, checking the pushrod for nice fluid movement, blade grips, swapped tail blades, etc.?
I have done each and every one of them.

The only thing I have not done is check the thrust bearings on the tail grips.

By the way, what heli do you have the TG7000 on???

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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01-18-2009 04:20 AM  9 years agoPost 15
TMoore

rrMaster

Cookeville, TN

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It is on a Cypher 3D with 9257. I'm also flying it with a 72mhz FM radio.

TM

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01-18-2009 04:56 AM  9 years agoPost 16
Sean Williams

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Santa Clarita CA

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It's something mechanical. Somethings loose in the tail system. Check your tail grips and tail hub.

Team Avant
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01-18-2009 06:32 AM  9 years agoPost 17
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Check your tail grips and tail hub.
What should I be checking them for?

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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01-18-2009 06:43 AM  9 years agoPost 18
Sean Williams

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Santa Clarita CA

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Check to see if they are sloppy, loose (as in ANY screw) or binding. Even the most inconspicuous set screw could cause this same issue. A year ago I had the same symptoms and I couldn't figure out what was causing it. Turns out my tail blade grips were loose.

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01-18-2009 07:09 AM  9 years agoPost 19
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Woo Hooooooooooooooooo!

Holy Sherlock Holmes Batman, I solved the mystery!

You guys got me thinking about the servo, so I decided to do a bench test to see if the servo was doing anything weird when it should be still.

Well this is what I found:

When commanded by stick movement, the tail servo works fine.

When the system is on, with no command, and the heli is sitting still, the servo sits perfectly still. ( I was expecting something weird here).

When I pick up the heli with the gyro in HH and move the heli back and forth (left & right) quickly, the servo operates like expected.

However, when I moved the heli back and forth slowly, the gyro is not sending a command to the servo - it is fooled by slow movements back and forth!

The gyro is bad!

I tried this same bench test with a heli with a 401, and one with a Solid-G, and no matter how slowly I turned the heli, the gyro of course commanded movement in the servo!!!

Anyway, this perfectly explains the weird hunting/wandering behavior in a hover. It starts to slowly wander, and the gyro does not give it a command at first, then the gyro "wakes up" and gives it a command. This is why it did not look like a drift, because it would keep "drifting" but then correcting back into position! Explains it perfectly!!!

So everyone with a TG7000 gyro please do me a favor. Do this bench test and see if you can move it slow enough that it doesn't move the servo. I'm betting that yours works fine, and that my gyro is just bad.

Please do this quick bench test and let me know what you find.

Thanks!

Woo hooooooooooooooooo - I love it when I have the definitive, no kidding answer!!!

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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01-18-2009 01:25 PM  9 years agoPost 20
Eury

rrProfessor

Dover NH

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I just tried it on my 2 helis with that gyro and they both respond just fine to slow movements.

Nick Crego

Citizen #0168

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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › TG7000 gyro. Strange hunting/wandering behavior in hover. Woo hoooo - A Break in the case!
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