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HelicopterRadio - Servo - Gyro - Gov - Batt › Ds760, 9256, 100% gain in HH and no tail wag?
09-05-2009 02:03 AM  8 years agoPost 1
rerazor

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Mich.

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I'm running a DS760 / 9256 on a Logo 6003d (stretched to run 710's for AP), 95mm tail blades. I'm controlling the gain w/ a 9303 on the gyro sensitivity.

I have a slow tail wag every so often. When I turn the gain up to 100% I don't get a fast tail wag at all. I'm on the 3rd hole (15mm, I think) on the servo horn.

Shouldn't I be able to get a fast tail wag when I get close to 100% gain?

Thanks

Robert

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09-05-2009 08:44 AM  8 years agoPost 2
Skarn

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Pasadena, MD

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Do you have your gyro gain lead plugged into Aux2?

With the 9303 you MUST use aux2 if you want to use the gyro sense menu.

Skarn

It's better to burn out than to fade away...

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09-05-2009 10:58 AM  8 years agoPost 3
allns47

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Richmond IN.

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you will burn your servo up with 100% gain setting

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09-05-2009 02:38 PM  8 years agoPost 4
rerazor

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Mich.

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Yes, using Aux2 and understand 100% gain will burn the tail servo out. I just don't understand how I'm able to run the gain to 100% and not see a fast tail wag?

Thanks

Robert

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09-05-2009 04:23 PM  8 years agoPost 5
hornet dave

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Cedar Rapids, IA USA

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A slow headspeed perhaps?

I got a fever! The only prescription is MORE 6HV

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09-05-2009 04:28 PM  8 years agoPost 6
rerazor

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Mich.

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Yes, I'm running approx 1500rpm because for AP I don't need the vibes or the fast headspeed.

If its the slow headspeed how could I compensate for that?

Thank you

Robert

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09-05-2009 04:59 PM  8 years agoPost 7
hornet dave

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Cedar Rapids, IA USA

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speed up the tail rotor through gearing (if possible), longer tail blades, max out the tail rotor pitch range of course.

Is the tail performance bad in any way at a lower gain, like 50%? If it behaves OK for you, there's no need to run it any higher.

also, if you have camera equipment hanging a fair distance laterally from the main shaft of the heli, it will add a large moment of inertia to the heli and that tends to stabilize the yaw axis. It's sort of like having training gear on a heli, when you take the training gear off, sometimes you find that the tail starts wagging and you need to turn down the gyro gain.

I got a fever! The only prescription is MORE 6HV

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09-05-2009 05:44 PM  8 years agoPost 8
rerazor

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Mich.

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I'm running 80% gain. It holds great, its just sometimes I have a slight tail wag. When shooting HD video the slightest movement shows. Yes this heli is running a front mount for video and also a DJI XP GPS autopilot (I'm the distributor).

I'll get it figured out and try some longer blades etc... Don't think I can speed up the tail.

I just wanted some other opinions and see if I was overlooking anything.

Thanks for the help

Robert

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09-05-2009 10:32 PM  8 years agoPost 9
hornet dave

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Cedar Rapids, IA USA

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oh yep your heli easily has twice or three times the normal moment of inertia compared to a sport heli, which really dampens things out. I don't think you will ever see a fast tail wag associated with too high of a gain setting on that heli.

A few other things to look at regarding the wag - try a much lower gain setting, perhaps it's a static electricity issue on the tail belt, try some different gyro tape configurations, make sure the gyro cable is not mounted in a way that cause excursions to perturb the gyro. It could also be an EMI issue where the motor or servos cause interference with the gyro.

That's a cool setup you got. good luck with the tail issue.

I got a fever! The only prescription is MORE 6HV

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09-06-2009 02:20 AM  8 years agoPost 10
rerazor

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Mich.

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Thanks, that makes sense. Its just one of those things where I had to look outside the box.

Here is a short clip of the first test flight of that setup. Still a few things to fine tune.

http://www.youtube.com/watch?v=L3J2RrJ7yow

Robert

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09-06-2009 03:37 AM  8 years agoPost 11
Mike Bilyk

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Tulsa, OK - USA

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cool video, great quality.

AMA # 617778
Team MasterCard

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09-06-2009 01:08 PM  8 years agoPost 12
hornet dave

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Cedar Rapids, IA USA

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sweet!!!

I got a fever! The only prescription is MORE 6HV

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HelicopterRadio - Servo - Gyro - Gov - Batt › Ds760, 9256, 100% gain in HH and no tail wag?
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