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HelicopterThunder TigerOther › CSM 310 Gyro Problems
01-26-2007 04:09 PM  10 years agoPost 1
Bignose13

rrApprentice

Pontypridd

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Hi
I have the above gyro connected to a futaba 148 servo on my Raptor 30
The problem is that i get slight tail wag, I have turned down the gain and the servo arm was set at 90 degrees before installing gyro and the tail slider was smack on in the center when i attached the pushrod
Any thoughts on this would help me loads as i have the bird flying like a dream otherwise

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01-26-2007 05:28 PM  10 years agoPost 2
jschenck

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La Vista, NE.

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Here is a good read for tail wag issues:

http://www.raptortechnique.com/ts-gyro-tail.htm

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01-26-2007 05:39 PM  10 years agoPost 3
Colin Mill

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England

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Hi

Can I ask a few questions?
Is it a micro 310 or a full case 310 (they are quite different as the micro 310 has second integral HL and DS support)

Also, what arm length are you using on the servo and what Tx gain range have you tried?

Best regards

Colin (CSM)

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01-26-2007 08:01 PM  10 years agoPost 4
jsenicka

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Eagle River, WI

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running a servo faster than a dog slow 148 would help as well.

Jim Senicka
Team Manager, GrandRC Flight Team

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01-26-2007 08:25 PM  10 years agoPost 5
jschenck

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La Vista, NE.

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If you don't want to spend a lot of money on a better tail servo, I've had good luck running a Hitec HS525. But I'd follow whatever Colin has to say!

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01-26-2007 08:57 PM  10 years agoPost 6
Colin Mill

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England

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Hi Jim

While a quicker servo is good I set myself a challenge in designing the code for the micro 310 to get acceptable lock with a very modest servo. The second integral helps to give a good hold with only lowish gain values. I did most of the tests of the gyro with a 3151 (basically a 148 with digital amplifier) and it did quite well (you can never get a hard stop with a slow servo but otherwise it was OK)

Best regards

Colin

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01-26-2007 09:42 PM  10 years agoPost 7
Bignose13

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Pontypridd

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Hi Colin
It's the full case 310 and I am running at 45% gain but started at 60% but still am getting the waggle, the arm length is at 15mm

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01-26-2007 10:48 PM  10 years agoPost 8
Colin Mill

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England

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Ok, I think the first thing to do is to increase the arm length. The longest arm that comes with the 148 is 18mm and this is only just long enough - 20mm would be better and I have on occasion fashioned an extension out of sheet carbon or glassfibre.

The longer arm makes better use of the speed of the servo.

Check also for any slop or stiffness in the linkage. Slop especially can cause a steady slow wag of the tail in heading lock (if the wag is visible in HL but not in conventional mode then its almost diagnistic of a problem with the linkage)

I guess its worth trying the longer arm and see how it goes. Check for the wag in both HL and conventional mode and for a range of gains. The diagnosis can be a bit involved but there are a few pointers:-

If the wag comes on with a small rise in gain then it is gain related. If the wag is not very sensitive to gain but gradually increases with gain then check if it is also present in conventional mode. If the wag is in HL only then look for slop and stiffness in the linkage as HL is more sensitive to this than conventional mode.

If the wag is present in both modes then look at the possibility of vibration affecting the gyro sensor. Slightly re-siting the gyro or changing the run of the cables to the gyro can help this. If the wag actually gets worse with reducing gyro gain then the motion is almost certainly due to uneven running of the engine (with the gyro's ability to mask it reducing as the gain goes down)

Anyway, give the longer arm a try and let me know what you find with the tests.

Best regards

Colin

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01-26-2007 11:12 PM  10 years agoPost 9
Bignose13

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Pontypridd

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Thanks Colin
I am flying on sunday morning and report back
Thanks for your help
Simon

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HelicopterThunder TigerOther › CSM 310 Gyro Problems
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