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Home✈️Aircraft🚁Helicoptere-Elec-Helicopters New or Limited ActivityE-Sky › Somthing's wrong; either the tail servo or gyro setting?
06-19-2009 06:24 AM  11 years ago
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BOB WHO?

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Downey, Ca.

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Somthing's wrong; either the tail servo or gyro setting?
I've been playing around with the HBK2 lately and I can't figure this out. The problem occurs when I invert or flip this heli; the tail will not hold. It piros with negative collective. I have gy401 and an airtronics 94761Z tail servo. Could it be that this is a slow servo and 'delay' should be turned up some? I never used the delay setting because I used to have a digital futaba (9257) on the tail and it held pretty well. I seem to remember that the delay setting is for slower servos. Is that correct or am I barking up the wrong tree? Maybe something else?
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06-19-2009 08:36 AM  11 years ago
what_the_helli

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cookeville, tn USA

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gy401 and an airtronics 94761Z tail servo
I had that setup on a trex450 and never used any delay....
does it happen "as" your going over or when you hold it inverted?
I put the fun in dysFUNctional :)
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06-19-2009 11:38 AM  11 years ago
BOB WHO?

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It happens as soon as negative collective is applied, so I would say 'as' I'm going over. BTW the tail holds real well in upright flight with full collective pops. I just changed out the servo recently to install the 9257 on a trex 450. The airtronics servo was just laying around the bench so I decided to try it. I'm not sure that it's a digital servo, now that I think of it, and the setting on the gyro was left on 'digital' because of the 9257.
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06-19-2009 03:44 PM  11 years ago
Gyronut

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Martinsville In.

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Are you running a V Curve for the throttle..???

If so try a flat line at about 95%.
Rick
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06-19-2009 04:07 PM  11 years ago
BOB WHO?

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Downey, Ca.

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Iam running 100% throttle in stunt 2. Because the gyro is so good, I just thought that it had to be this tail servo or maybe the delay setting (0 delay now).
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06-19-2009 10:42 PM  11 years ago
Heli_KV

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Ottawa, Canada

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Why don't you try for the sake of experiment to add expo to rudder and see if drift is less. Maybe you just affect rudder on negative throttle. Just a guess, I do not see anything better. Sorry if it sounds too obvious.
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06-20-2009 12:43 AM  11 years ago
BOB WHO?

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Downey, Ca.

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Thanks Heli KV
I might give that a try, but I'm curious about the delay function. Does anybody have experience with that feature on that gyro?
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06-20-2009 01:02 AM  11 years ago
Heli_KV

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Ottawa, Canada

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Sorry for ths advise for sure, but I heard stories, when people complained about tail wag and it ended up in figers tremor - natural thing for too sensitive servos. Expo cured this.

On GY401 I used delay on HBK when I had analog servo to avoid tail hunting on piro stops. Once I got digital, I set delay to 0 and it is OK.

On another heli, even using digital servo I used initially delay to get rid of tail hunting (which was wrong), but after that I set properly mechanical and gyro gain and set delay to 0 and tail is OK. There is a bit of tail hunting on abrupt stops and a bit of wag in some cases, but I think my servo is not that much good. I use 9650. On punches there is tail drift.

On another heli with way better servo and same gyro on very abrupt piro stops there is a tiny bit of hunting, but almost invisible. Practically no hunting. No tail drift at all on more strong punches then in previous heli. Servo is important.

That's all my experience with GY401.
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06-20-2009 02:01 AM  11 years ago
zaw

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Lebanon, NH - USA

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Slow Digital still need some delay.ಠ_ಠ HBK2 built with inexpensive parts! ٩๏̯͡๏)۶ Gaui425
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06-20-2009 02:02 AM  11 years ago
Heli_KV

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Ottawa, Canada

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Agreed.
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06-20-2009 02:05 AM  11 years ago
BOB WHO?

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Downey, Ca.

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I think that this servo, although digital, is SLOW. Ok I'll try that.
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06-20-2009 02:58 AM  11 years ago
Gregor99

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Western Wa

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Why don't you try for the sake of experiment to add expo to rudder and see if drift is less.
Had this happen recently on the T500. Tail-in backflips would end side-in. I'm not ready for piro flips. A little bit of expo on the rudder took care of it.
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06-20-2009 03:17 AM  11 years ago
fenderstrat

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Aston,Pa

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well if you are saying that the tail holds really well upright and the problem happens when you go inverted maybe you need new gyro tape or the wires need to be secured better. As you are going over the gyro is moving?or the wires flopping around are causing the gyro to have issues.

i dont see a servo/gyro losing hold just because of an inverted hover,if it was a set up issue wouldn't it do it always?

and for digital servos delay should be 0 always
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