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Home✈️Aircraft🚁HelicopterThunder TigerRAPTOR 50 › X50 and GY520 issue
06-05-2011 03:05 AM  9 years ago
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robb

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Vienna, MO

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X50 and GY520 issue
Took my new X50 to the St. Louis Funfly today to get some help on a tail wag issue. I've been reading several posts on the GY520, including this POST, to no avail. The guys at the funfly looked over my setup, mechanical limits, etc. It wags in both HH and Rate mode. Engine is running perfect. Nothing we did could get rid of the wag.

One of the things that was noticed was that if I did a quick climbout, the tail would hold very well (no drift). We tried raising my headspeed (I had it tach'd at 1860 in Normal), but still wags. Idle-1, with a higher headspeed, showed no change.

I'm about to pitch this gyro and put a trusty GY401 on it . Anyone have any idea? I'm using a BLS251 servo, the gyro is on the top shelf, and my ball link is 13.5mm from center of servo.

Help!

Thanks,
Rob
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06-05-2011 05:42 AM  9 years ago
NitroAl

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Gold Coast Aus

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That sounds like a sticky tail pitch slider or the link is binding due to a bend or the link supports along the boom are not in correct alignment.
Pop the ball link off at the servo and move it through it's full travel by hand, it should be smooth and with out any resistance. If you feel resistance then pop off the ball link at the tail and check the linkage rod and the rudder pitch assembly seperately.
When new both the raptor and X50 always have a little sticky spot at around full left rudder (slider out) but should be smooth through the rest of the range. It is not unusual to have to give the tail shaft a bit of a rub with wet&dry.

Short list of things that cause wags

Sticky mechanics
Sloppy or loose components in mechanics
Too high a gain setting
Gyro mounted too soft
Incorrect servo type selected in gyro
Tail blades in incorrect orientation (dont ask me how I know)
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06-05-2011 02:43 PM  8 years ago
robb

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Vienna, MO

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Thanks NitroAl,

We did find a little binding in the tail rod, and we corrected it. Still the same issue; it didn't get any better (I sure was hoping it would ).

My gain is down to about 32%. I went lower, but no change. There was a couple of guys that had GY520 experience looking over the X50 setup, and everything they could think of pass with flying colors (binding, mechanical set up, etc). We even tried different pad combinations. The only thing I have yet to try is to put it on the middle shelf. I also have some Zeal Gel pads coming from Heliproz South that I am going to try.

Rob
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06-05-2011 05:04 PM  8 years ago
robb

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Vienna, MO

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One of the things that was noticed was that if we picked up the heli and turned the nose one way, the tail slider would quickly go to the mechanical stop, and then move it the opposite direction, and the tail would slowly move to the other mechanical limit. They thought that it was weird on how it did that. Not sure if that is the reason...bad gyro??
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06-05-2011 05:10 PM  8 years ago
johnbs8

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roseville michigan

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i had issues the same. for the final fix i used one futaba 2mm gyro pad and the gyro on the top shelf. no metal plate just gyro and 2mm pad. that solved all my issues. give that a try. Also check the screws that go to the tail blade grips from the tail pitch controll link. if those screws are super tight, they will make it tight on the tail shaft. loosen them a little bit and check how smooth the slide will be. GLTT X50 Nitro
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06-05-2011 05:22 PM  8 years ago
Gary H

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Minnesota USA

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Rob, move out one hole on servo arm,gyro mite b seaking, all my 520s r out one hole further. The reason the servo does not stop where u think it should is because it is in heading hold.

Gary H
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06-05-2011 05:24 PM  8 years ago
WessCo

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Summerville, GA USA

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I'm not sure I like the gyro tape, metal plate, gyro tape setup. Gonna see how it goes, but will likely change mine out to just gyro tape. It's a 520 as well. It's held good so far, with a rich engine for break in.
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06-05-2011 07:21 PM  8 years ago
petmotel

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DeKalb, IL.

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I notice one thing that hasn't been mentioned are the thrust bearings in the tail grips. Might check that they are installed correctly. I've heard of tail wag caused by binding thrust bearings.

I'm using the 520 on the upper deck mounted soft with a 3mm pad, metal plate, 3mm pad, with cord exiting out the side, no strap. Servo ball at 13.5mm out which gives 90 degrees of servo travel (I don't go to full travel on the tail rotor side). Tail is perfect, although it might bounce a little on really hard, quick stops which I don't do anyway.

Jay
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06-05-2011 11:35 PM  8 years ago
robb

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Vienna, MO

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Thanks all. I think once the new pads come in, I'm going to completely reset the gyro, and start over and see what that does. I want to keep it on the top shelf if possible but if the above doesn't work, then I'll move it to the middle shelf.

I'll update as I find out. Any other help would be most welcome
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06-07-2011 01:12 AM  8 years ago
robb

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Vienna, MO

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I got my tail to hold

I put just one Futaba gyro pad on the top shelf, put the gyro on it, and reset it to factory defaults. Went through all the parameters, and then hovered it in rate mode. Had to do a little adjustment to get it to not drift (one turn I believe) and put the gain down to about 68%. Landed, rebooted the gyro for AVCS, and, after some trial and error with the gain, got it to hold rock solid at 42%. Not sure why the big difference in the gain, but I'll take it.

Thanks all for your help. I should have done this to begin with.

Rob
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06-07-2011 03:08 AM  8 years ago
johnbs8

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roseville michigan

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glad to hear rob. i know another raptor X50 pilot that does the one pad and thats what i did to reslove my issues. gain with the 520 is normaly between 35 and 45%. i think mine is at 40%TT X50 Nitro
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06-11-2011 03:42 AM  8 years ago
WessCo

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Summerville, GA USA

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Anybody had this problem....

The GY520 holds great until you start throwing it around...then I get a vicious tail wag. I think it might be a pad problem, will change them out tomorrow.
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06-12-2011 08:44 PM  8 years ago
geomecc

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Long Island ,NY

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I had same problem with gyro on top shelf. moved it to middle shelf with one futabA 2mm pad metal plate and another 2mm pad my gain is at 43 in HH and that solved most of the wag it still has slight twitch but I can live with it for nowR I P Roman Jr. Team SKOOKUM SRW EFC
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06-12-2011 09:39 PM  8 years ago
johnbs8

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roseville michigan

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top plate, one 2mm futaba pad and gyro. nothing else holds rock solid. dont forget to mechanicly setup your tail.TT X50 Nitro
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06-12-2011 11:26 PM  8 years ago
WessCo

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Summerville, GA USA

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I'm going to change the pad setup tonight, but I am also going to lower the gain as well. It was on 49, which I could have sworn it was like 44. It is now though.
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06-15-2011 03:09 AM  8 years ago
johnbs8

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roseville michigan

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wessco any luck?TT X50 Nitro
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06-15-2011 02:18 PM  8 years ago
WessCo

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Summerville, GA USA

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Went to fly this morning, but a sudden trip to the porta-potty ruined the day. That thing is nasty! Hopefully, I'll get out in the morning. I work nights.....
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06-15-2011 02:42 PM  8 years ago
trekrider586

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Sylacauga,Al

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Suscribed.
I am having simular problems.But what's throwing me is the heli done great until it set for a week while I was on vacation.
(maybe it's just mad for me not taking it)
I am running the pad,metal,pad combo.
thinking I will try just one pad.
anyone strapping the gyro down as well?
it's better to ask for forgiveness than for permission
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06-15-2011 09:05 PM  8 years ago
johnbs8

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roseville michigan

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i starapped mine down just for ****s n giggles. had to make some cuts on the velcro to get it to center properly and also added a piece of velcro to the top of the gyro.TT X50 Nitro
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06-18-2011 05:03 AM  8 years ago
WessCo

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Summerville, GA USA

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Update:

The gyro mounting has been changed. Looking over the X50, I have found that I didn't put the nuts on the bolts that hold the boom supports on. Maybe this is what caused my tail wag...a loose tail. Going to go out tomorrow and try it out. 5 flights with loose boom supports...maybe I'll have a different helicopter now. I was pleased with it before.
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Home✈️Aircraft🚁HelicopterThunder TigerRAPTOR 50 › X50 and GY520 issue
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