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03-30-2009 06:13 PM  9 years agoPost 1
Elgreco

rrVeteran

Montreal,QC-Canada

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I just flew my Turbulence with a Spartan installed. New heli, first time flown.
I setup the servo with 90 degree angle to give me about 8 degrees deflection on the tail blades as per Finless instructions, but when I hovered, it slowly turns the nose to the left.

I don't know if I have some kind of vibration but I doubt it as it's just built and all LOOKS ok.

I don't think it should be a gain issue, but I'll try anyway.

Flying with x9303, 9254 tail servo.

I just thought to ask for any suggestions. I know these things can drive you crazy by the time you find out what it is.

Trex 550 V-BAR, Trex 700 V-BAR, N5-os55VBAR, TREX700E V-BAR /X9503

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03-30-2009 06:43 PM  9 years agoPost 2
bkervaski

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Birmingham, AL, USA

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If it's not vibration then reroute/isolate/shorten your gyro wires and/or relocate the sensor.

Also, use Zeal gel tape under the gyro instead of the foam pads that come with it.

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03-30-2009 07:48 PM  9 years agoPost 3
Angelos

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nr Oxford, OX11, UK

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Extensive advice on this subject is available on our technical support knowledge base http://www.spartan-rc.com/resources...c=20&category=9

-Angelos

Spartan RC R&D

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04-02-2009 12:45 AM  9 years agoPost 4
Elgreco

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Montreal,QC-Canada

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Before I attempt anything serious changes this weekend I thought I throw this in the discussion as it just came to me after reading another thread...

Since I am using the X9303, I did bind the radio with the rudder pointed to the left as per Finless' suggestion, BUT I think the throttle at that point was not at low stick, rather mid stick.

Anyone thinks that this might be an issue ? Maybe the gyro is reading false center position ? I just don't know if the throttle position would affect it on binding...

Just a thought.
I will attempt some changes during the week and hopefully post back with results next week.

Thanks.

Trex 550 V-BAR, Trex 700 V-BAR, N5-os55VBAR, TREX700E V-BAR /X9503

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04-02-2009 03:37 AM  9 years agoPost 5
RayoVac

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raptor4ever is a THIEF!!!

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I did not think with the latest firmware versions that you had to bind that way anymore. (with the sick held over)

Also... I know the Spartan manual and Bob F. subscribes to the 8 degree deal with servo centered... but I setup both my helis (with Spartans) with Servo Center = Tail Slide Center. HOWEVER... I only use AVCS mode (head holding mode) on the Spartan, I don't use Rate mode. Thus the Gyro keeps the heli straight and I get equal travel left and right on the tail slider.

Many conversations about this very issue out there.

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04-02-2009 06:54 AM  9 years agoPost 6
mchammer

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California,USA

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sounds like you are in rate mode and length of the tail rotor cotrol rod needs adjustment to trim it out. As already stated you could just run only in heading hold and not worry about it.

Peace Through Superior Firepower!!!

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04-02-2009 01:04 PM  9 years agoPost 7
Elgreco

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Montreal,QC-Canada

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No, not in rate mode definitely...
Thanks for the replies though..

Trex 550 V-BAR, Trex 700 V-BAR, N5-os55VBAR, TREX700E V-BAR /X9503

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04-02-2009 06:30 PM  9 years agoPost 8
Zaneman007

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Texas - USA

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did bind the radio with the rudder pointed to the left
On the old version this would keep the gyro from initializing.

On the NEW version the gyro WILL initialize with the rudder pointed to the left. So if you have the new version, you might want to.....stop doing that.

Old Guys Rule!

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04-03-2009 03:26 AM  9 years agoPost 9
mchammer

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California,USA

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No, not in rate mode definitely...
Thanks for the replies though..
then your gain must be too low.

Peace Through Superior Firepower!!!

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04-03-2009 01:26 PM  9 years agoPost 10
Elgreco

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Montreal,QC-Canada

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would a low gain make the gyro constantly move towards left turn for example?. Wouldn't it show like a random wag ?

Mine, if I let go the rudder stick, you see it slowly turning the nose left.As if the gyro is not setting straight.
There is no wag or other "jerk" at all, just a constant drift.

I know I had a lot of suggestions and I appreciate all of them. Unfortunately with the rain all this week up here I had no chance to test some of the things I could do. As soon as the weather gets better (which only seems a few days still ) I will try and post back.

Thank you all.

Trex 550 V-BAR, Trex 700 V-BAR, N5-os55VBAR, TREX700E V-BAR /X9503

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04-03-2009 03:27 PM  9 years agoPost 11
GScott

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Lewis Center, OH

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Good luck. I had a Spartan on a Synergy last year and nothing I did fixed the drift. It was so bad that if I did a pass across the field and didn't touch the rudder the heli would have rotated 45 degrees by the end of the pass. I had someone who knew Spartan's help out and we could never get it fixed. I replaced it with a Solid G and the problem went away.

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04-04-2009 07:28 AM  9 years agoPost 12
mchammer

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California,USA

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would a low gain make the gyro constantly move towards left turn for example?.
Yes.
Wouldn't it show like a random wag ?
No

Keep cranking up your gain till the tail hunts back and fourth at a rapid rate. Then back off a bit.

Peace Through Superior Firepower!!!

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04-04-2009 01:02 PM  9 years agoPost 13
smallplanes

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S.C. ,SSA

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Elgreco it says on the last page in small wrighting if you can't get it setup right to sell it to smallplanes cheap or give it a big hit with a hammer.LOL


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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04-04-2009 01:25 PM  9 years agoPost 14
Elgreco

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Montreal,QC-Canada

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LOL.....

Trex 550 V-BAR, Trex 700 V-BAR, N5-os55VBAR, TREX700E V-BAR /X9503

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04-04-2009 10:13 PM  9 years agoPost 15
Barney

rrKey Veteran

Inverness Scotland

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Elgreco. This sounds very much like you have a small amount of trim programmed in somewhere. (there should be none) This would cause the creep you describe.

Brian

SPARTANRC Team pilot

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04-04-2009 10:24 PM  9 years agoPost 16
Elgreco

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Montreal,QC-Canada

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Barney, that was the first thing I checked...Had no trim in either modes.

One thing that comes to mind as I go over this, is that there is a possibility that when I went through the original programming, I might, said might, not sure, have had already programmed gain in my radio from before, and I set it up initially with gain in the radio. I don't know if that would affect it, but I thought to mention it.

Last night I upgraded to the latest firmware, (got to love those netbooks with bluetooth on the bench while you work on the heli)and I am going to redo the programming from the beginning.

Sometime by next weekend I will take it out for testing and we'll see. I hope it's something I did wrong in the programming and not vibration. It's a new heli and I am as sure as I can be it's vibration free. I just hate to look for vibrations..

Thanks.

Trex 550 V-BAR, Trex 700 V-BAR, N5-os55VBAR, TREX700E V-BAR /X9503

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04-07-2009 07:16 AM  9 years agoPost 17
mchammer

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California,USA

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^^^now that you mention it. being that it is a new motor you may be running it rich to break it in easy. This can cause the gyro to act up also.

Peace Through Superior Firepower!!!

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04-07-2009 08:05 AM  9 years agoPost 18
raptorheli2

rrElite Veteran

rip off britain and no changing it

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Good luck. I had a Spartan on a Synergy last year and nothing I did fixed the drift. It was so bad that if I did a pass across the field and didn't touch the rudder the heli would have rotated 45 degrees by the end of the pass. I had someone who knew Spartan's help out and we could never get it fixed. I replaced it with a Solid G and the problem went away.
i can put my hand on heart and say confidently you have a vibration problem there and i'd bet good money your TT needs dialed. had to do this with my own synergys when i went from a 611 to a csm 720 at the time. the TT couplers were at 4 thou and 10 mins with a dial gauge fixed it. i'm constantly amazed why people blame gyros for drift problems with 99.999999% of the time it's the airframe. it wasn't someone that knows about spartans you needed, it's someone that can find vibes or where best to mount the gyro. even the wires being routed incorrectly will cause it for example.

cheers


www.waterfoothelis.com

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04-08-2009 03:55 AM  9 years agoPost 19
mchammer

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California,USA

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even the wires being routed incorrectly will cause it for example.
+1

Peace Through Superior Firepower!!!

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04-08-2009 01:00 PM  9 years agoPost 20
Barney

rrKey Veteran

Inverness Scotland

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Elgreco. If it doesn't move prior to starting the model you have no trim causing issues.

Once its in the Air if its still doing it, possibly Revo Mixing is active or a setting is different in the other flight mode and has been overlooked. Dead easy to miss this If your using Futaba as each flight mode is completely seperate trims/mixes an all.

If all the above is ok, wires are not flopping around etc It could well be a vibration issue..A quick way of playing around with the mounting is to use a velso strap and tighten/lossen a little to see if theres any change. The Spartans are very resilient to vibration.

One more..make sure the model is not mooved untill the Gyro boots.

Best of Luck

Brian

SPARTANRC Team pilot

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