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T-REX 450 tail wags


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lanchester
Hover Master
Hover Master


Joined: 12 Aug 2007
Posts: 11
Location: A residential area :)

PostPosted: Wed Aug 15, 2007 3:58 pm
PostPost subject: T-REX 450 tail wags
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My T-REX 450 tail's is wagging! It was fine until I did some maintenence on the tail boom (replaced it) and now the tail is wagging. I tried setting the gain the the gyro and now have it up to +40% and it still wags. In fact, the more I turn up the gain, the more it wags. When the gain is low, the the tail doesn't hold and the nost drifts right.

Does anyone know a fix? It's driving me crazy.

I am using the Hitec HB56 servo and Futaba gy401 gyro.
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silhouette015
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Joined: 06 Jul 2007
Posts: 581
Location: Thailand

PostPosted: Wed Aug 15, 2007 7:07 pm
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Almost 100% of the time, tail wags occur because the gyro gain is set too high. The gyro gain is how much the gyro tries to correct for tail movements. You can read this article for more information about the subject.

The way you fix this is to lower the gain. Keep lowering the gain until the wag stops. Don't over do it though, other wise the tail won't hold well and the nose will drift.
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hound15
Extreme 3D
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Joined: 11 Apr 2007
Posts: 160

PostPosted: Thu Aug 16, 2007 2:29 pm
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Another probable cause is the tail boom being loose or the belt being loose.
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lanchester
Hover Master
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Joined: 12 Aug 2007
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Location: A residential area :)

PostPosted: Thu Aug 16, 2007 7:47 pm
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I got it sorted, thanks Very Happy

It was the gyro gain. I now set it at +20 and it's steady.
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silhouette015
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Joined: 06 Jul 2007
Posts: 581
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PostPosted: Fri Aug 17, 2007 9:39 am
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ีummm.. the gain shouldn't be that low. Maybe you've got a mechanical problem of some type. Also, check that the tail ball link is set on the first screw on the tail servo, otherwise you'll get a low servo/gyro resolution.
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hound15
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Joined: 11 Apr 2007
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PostPosted: Sun Aug 19, 2007 10:23 pm
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ummm I think it's healthier if the gain is in the +30ish range.
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bladeboy
Flying Inverted
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Joined: 29 Dec 2007
Posts: 58

PostPosted: Sun Dec 30, 2007 11:56 am
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Whenever I go to fly my blade cx2 down stairs I dont know why but when I take off and i am 1 foot above the ground it would be a miracle for it to hover there withoug drifting a certainw ay mine seems like you have too think hard when hovering too keep it in a 3 feet circle. And what is the nob on the top right controler of the blade cx2?
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