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Old 11-12-2009, 09:40 PM   #1
byter182
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Default Tail snapping to the right on belt cp

Wondering if someone has experienced anything like this. I got a new Telebee gyro for my Belt CP about a month ago. I was having issues with my esky hh gyro so I thought I'd replace it with the new version telebee as I'd heard it was an excellent gyro. Since I've installed the gyro my tail seems to snap to the right while in a hover. It's not the typical wagging you get from too much gain. It's just a sudden approximate 1 inch snap to the right. Not enough to throw the heli out of control. The tail still holds tight but periodically it snaps to the right. Occasionally you can see the tail servo horn suddenly move in one direction when the heli is plugged in (not in a hover). The tail servo I'm using is the DS290G. Not sure if it's something related to the gyro or the servo. Could it be a bad Telebee gyro I got from HeliDirect? If so, might they replace it after 30 day? Has anyone come across a problem like this?
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Old 11-13-2009, 12:25 AM   #2
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Almost sounds like interference. But I wouldn't have a doubt in my mind it's the servo or gyro.

Plugin one of the other servos into the gyro, and leave it sitting on the desk for a few moments, enough to see if it does the same thing as the current tail servo, if it does, we have confirmed it's not the servo but a gyro related issue.

Just for kicks and giggles, I'd check all your cables and wires for the gyro and servo. Ensure we got no snagged wires or explode wires from the insulation, as that's an antenna for interference.

I'd say ensure it's not vibrations but it's happening when the heli is completely still and stationary, so this is definitely an electrical issue/defect.

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Old 11-13-2009, 01:28 AM   #3
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Lube your tail belt and see if it goes away, might be static related.
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Old 11-13-2009, 01:49 AM   #4
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Quote:
Originally Posted by byter182 View Post
Occasionally you can see the tail servo horn suddenly move in one direction when the heli is plugged in (not in a hover).
This part of your question I can anwser, if you look in your manual on the top first page there is a warning that if the gyro is started in HH the servo horn may sometimes swing out.
Try starting your heli in rate mode and switch to HH at low rpm before take-off
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Old 11-13-2009, 12:18 PM   #5
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Also check that the tailbelt isnīt loose.
Ber60 have made a nice video on how to check belt tension, itīs in the super sticky.
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Old 11-13-2009, 06:38 PM   #6
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Quote:
Originally Posted by Ber60 View Post
This part of your question I can anwser, if you look in your manual on the top first page there is a warning that if the gyro is started in HH the servo horn may sometimes swing out.
Try starting your heli in rate mode and switch to HH at low rpm before take-off
I agree that you should try this also. You said the tail holds tight and its an "occasional " hard snap. Losse belts ect would more than likly have a continues effect on the tail IMO.
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Old 11-20-2009, 09:34 PM   #7
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I appreciate all your suggestions. I tried lubing and tightening the belt and starting the gyro in HH mode unfortunately all to no avail. The gyro is still doing the same thing - snapping to one side. I've concluded that the telebee is just defective and have sent it back to the vendor. I've progressively replaced various parts of my belt cp with copterX and t-rex parts. My belt cp is starting to look more like a t-rex w/the exception of the main frame and rotorhead. Therefore, based your forum suggestion I will soon be purchasing a t-rex clone kit. In that case I'm gonna want a more reliable gyro capable of 3D action. So I went and ordered a Logitech 2100T. I'm tired of fiddling w/low end gyros only to wind up with substandard head holding characteristics.

Anyone can suggest which t-rex clone kit is better - the CopterX AE 450 V2 from eHirobo or the EXI Aluminum 450 V2 from xHeli?
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Old 11-22-2009, 11:27 AM   #8
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I vote the CopterX kit
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Old 11-23-2009, 03:47 PM   #9
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not owned either yet, but theres a thread in here somewhere recent about getting the carbon + cnc EXI hit from xheli that ends up being less than the CX AE with either $5 off or free shipping coupons. FYI.
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Old 10-01-2010, 08:05 AM   #10
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byter182, I have exactly the same symptom on my Belt CP V2. I haven't checked if it's happening on the bench yet. I'm using a e-tech G105 gyro and a synergy tail servo, so that's not the problem. I've had it for a while now, since new gyro was installed I think, and pretty much ignored it. I'm a learner hoverer so it didn't hurt.

Except yesterday, I had new thing, where the collective glitched to full down for a split second and then back to where it was, just like the tail does. It was enough to throw the heli down onto the ground, but luckily the heli was 2 metres up (6 feet), so there was enough room for the downward speed to bleed off before the ground got in the way.

No damage done, but a big wake-up call was heard. There's clearly something wrong electrically, I'm thinking static, any other suggestions would be appreciated.
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Old 10-01-2010, 07:13 PM   #11
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Quote:
Originally Posted by Adventurer View Post
byter182, I have exactly the same symptom on my Belt CP V2. I haven't checked if it's happening on the bench yet. I'm using a e-tech G105 gyro and a synergy tail servo, so that's not the problem. I've had it for a while now, since new gyro was installed I think, and pretty much ignored it. I'm a learner hoverer so it didn't hurt.

Except yesterday, I had new thing, where the collective glitched to full down for a split second and then back to where it was, just like the tail does. It was enough to throw the heli down onto the ground, but luckily the heli was 2 metres up (6 feet), so there was enough room for the downward speed to bleed off before the ground got in the way.

No damage done, but a big wake-up call was heard. There's clearly something wrong electrically, I'm thinking static, any other suggestions would be appreciated.
I had a similar problem last year and for me it was my stock FM receiver. I took the receiver apart and found a loose piece on the PCB. I bought a new receiver and it fixed the problem, for me anyway.
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Old 10-02-2010, 05:53 PM   #12
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Yep, I had an interesting experience where if I reached for the heli and obstructed the radio, all the servos would start moving erratically. When I took my hand away, all was well again. I opened the radio, and I'm convinced that it was assembled by a welding student, big gobs of solder and dry joints everywhere. I think that the aerial is purely decoration.
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Old 10-02-2010, 05:59 PM   #13
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Just after posting this, one of my servos started acting up and died. (Third one in two months) So the theory around here is that the dying servo was generating interference. I've replaced all the cyclic servos now, so we'll see.

I'll report back after my next flight tomorrow.
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Old 10-03-2010, 04:27 PM   #14
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Ok, the tail snapping thing - gone.

The bird is still glitching in mid flight, not a lot but about once or twice per flight, roughly in the middle of the flight. Really bad ones, drops the bird about 2 metres.

Count me confused.
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