RunRyder RC
WATCH
 1 page 962 views POST REPLY
HomeAircraftHelicopterGasser Model RC HelicoptersOther › Gyro or Ignition Noise
05-29-2012 02:20 AM  6 years agoPost 1
ThumbBumper

rrVeteran

A little to the right and down!

My Posts: All  Forum  Topic

Hi Guys,

Just got my G30 back in the air after a rather nasty crash and now I seem to be having a new problem.

Just as the heli gets light enough to take off, the tail starts jumping back and forth anywhere from 5 to 30 degrees in random directions. I still can direct which way the tail moves when this is happening, but this "twitch" is very obvious and I won't fly it this way.

My question is this: Is it possible the gyro is toast from the crash, or is it that I might be getting ignition noise in it and causing the random jumping around? I did change the way I have the power routed, but if anything, it's further away from the ignition wire than it was before.

I have replaced all of the obvious including:
Boom, belt
tail shaft / hub / tail blades
main shaft / feathering shaft / main blades / flybar (yeah I still use one of those )

I can't see any noticeable vibration, so I don't think that is an issue.

Has anyone seen this and what did you do to correct it? I had about six guys working with me on this over the weekend and we are all scratching our heads on this one.

Thanks,
Bob

If it ain't broke, go fly some more!
http://facebook.com/groups/TORCHS/

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
05-29-2012 02:31 AM  6 years agoPost 2
rbort

rrProfessor

Franklin, MA - USA

My Posts: All  Forum  Topic

Check
1. Thrust bearings in blade grips installed backwards.
2. In/out play of tail rotor due to aluminum spacers for the tail rotor shaft wearing after normal usage.
3. One or more tail blades installed backwards.

-=>Raja.

MA 1005 Hanson 280, 4220 flts
Spectra 27 3DMax, 3310 flts
Whiplash V1-2 Hanson 300, 1618 flts
Whiplash V2 Hanson 300, 473 flts

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
05-29-2012 03:54 AM  6 years agoPost 3
RM3

rrElite Veteran

Killeen, Texas - USA

My Posts: All  Forum  Topic

Checking the gears inside the tail servo would be my first guess...

second check the entire tail pitch control linkage, slides, bushings and cams from the servo to the bushing on the tail shaft...

other things that come to mind:

check your one way bearing (or sprag clutch, but these are very robust so very unlikely to go bad) in the main gear...if its going bad by slipping randomly then it will have that effect on the tail as well.

One other place to check would be the clutch..make sure its still centered and lined up square with the clutch bell...any misalignment (even a very small amount) here will also fool around with the gyro, it happened to me with my Radikal G20 and GY701.

if the gyro/tail servo work on the ground with both the engine off and at low RPM...its gotta be a mechanical issue

showing a preference will only get you into trouble, 90% of everything is crap...

PM  EMAIL  Attn:RR  Quote
05-29-2012 10:52 AM  6 years agoPost 4
strat1960s

rrApprentice

San Antonio Texas

My Posts: All  Forum  Topic

I did not have a crash, however my Gasser produce the right amount of vibrations to cause the gyro to go nuts. After going through a lengthy list of possible causes I narrowed it down to the gyro,Futaba GY401. I decided to use my beast x and tail problems went away.
Does your Heli have more vibrations since the crash? I'd start by checking all the shafts to ensure they are straight and not producing vibrations. Additionally, the crash may have damaged the gyro. If you have another gyro I'd give it a try.

I always have fun. Some times are more fun than others.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
05-29-2012 02:06 PM  6 years agoPost 5
bmfrd

rrNovice

Maryland

My Posts: All  Forum  Topic

While checking make sure the gyro tape hasn't come loose and that the gyro's still firmly attached.

PM  EMAIL  GALLERY  Attn:RR  Quote
05-29-2012 05:54 PM  6 years agoPost 6
ThumbBumper

rrVeteran

A little to the right and down!

My Posts: All  Forum  Topic

Thanks for the feedback guys.

I've pretty much already checked all of the things suggested. I still have to try swapping the gyro, but I'll have to cannibalize my 600 for the time being. I don't have a spare gyro kicking around.

Mechanically, the tail is smooth as silk no binding or anything like that. The tail servo moves smoothly when given left right stick. No end play in the tail shaft, grips, one way bearing is rock solid too.

I double checked to see if the clutch was square to the clutch bell, and it's dead on. If anything, I see less vibration now than I did previous to the carnage.

I didn't notice any movement of the tail when the engine was running on the bench, but I'll pay more attention to that next time I check it. I think the first thing I'm going to try is really shorten the power lead back up and see if that helps. I did change the way I ran the power which was the cause of the crash to begin with. If that don't help, then next step will be to rip the gyro off the 600 and give that a try.

Damn, this is frustrating!

Thanks,
Bob

If it ain't broke, go fly some more!
http://facebook.com/groups/TORCHS/

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
05-29-2012 06:40 PM  6 years agoPost 7
RM3

rrElite Veteran

Killeen, Texas - USA

My Posts: All  Forum  Topic

Damn, this is frustrating!
I feel your pain Bob...

have you tried a filter capacitor between the gyro and RX yet? it fixed a random tail shake on my Trex600esp a while back as the ESC was putting out enough noise to mess with the 401 on it.

somtimes when i get mine running "just perfect" for a week or two...I start to get the feeling that the heli gods are gonna change that on me just to piss me off.

showing a preference will only get you into trouble, 90% of everything is crap...

PM  EMAIL  Attn:RR  Quote
05-30-2012 12:44 AM  6 years agoPost 8
ThumbBumper

rrVeteran

A little to the right and down!

My Posts: All  Forum  Topic

^ LOL, boy isn't that the truth!

If it ain't broke, go fly some more!
http://facebook.com/groups/TORCHS/

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
05-31-2012 05:21 AM  6 years agoPost 9
madog

rrNovice

Mountain View, CA USA

My Posts: All  Forum  Topic

Does it sound like a sheep or a goat when it is doing this? If so..need a new piston and cylinder.

PM  EMAIL  Attn:RR  Quote
05-31-2012 10:58 AM  6 years agoPost 10
shawmcky

rrElite Veteran

Isle of Wight,United Kingdom

My Posts: All  Forum  Topic

Are you using a resistor plug for you engine?Power battery is up to the task?Engine in good tune?

Team- unbiased opinion.K.I.S.S principle upheld here

PM  EMAIL  GALLERY  Attn:RR  Quote
06-01-2012 10:38 PM  6 years agoPost 11
ThumbBumper

rrVeteran

A little to the right and down!

My Posts: All  Forum  Topic

Maddog, No, Engine is almost new. Only have about 1 gallon through it so far.

Shawmcky, No, I wasn't using one before and was not having any problem, but it's worth a try. Other than that, the engine runs like a top, very smooth for not being all the way broken in yet. Battery if brand new NiMh pack with only 4-5 flights on it so I doubt that is the problem. I have a voltwatch on the line and it looks like it holds steady.

I think tomorrow I'm going to try using a very short power lead like I was using before the crash. If things clear up, then most likely I have an ignition problem. Next step will be to swap gyros and make sure that it didn't get toasted in the crash.

Thanks guys...

If it ain't broke, go fly some more!
http://facebook.com/groups/TORCHS/

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
06-01-2012 10:50 PM  6 years agoPost 12
shawmcky

rrElite Veteran

Isle of Wight,United Kingdom

My Posts: All  Forum  Topic

A resistor plug is a must really,i would try that first,my gassers electronics glitch like hell without the "R" plug.

Team- unbiased opinion.K.I.S.S principle upheld here

PM  EMAIL  GALLERY  Attn:RR  Quote
06-02-2012 03:43 PM  6 years agoPost 13
Neon Juripuri

rrVeteran

Peculiar Mo USA

My Posts: All  Forum  Topic

+1 on trying a new plug. They weren't made for impact,and a crash could have caused something to change.
Cheap to try,and if it doesn't fix it,you need a spare one anyway.
Fred

PM  EMAIL  GALLERY  Attn:RR  Quote
06-02-2012 07:07 PM  6 years agoPost 14
nitro fun

rrApprentice

Oc ca

My Posts: All  Forum  Topic

What is your tail servo?

Hold your tail blades and cycle the tail to load up the servo to see if their is a twitch. Pot wearing out Or dirty.

I have had a 401 go out on me I the air. It went completely dead with no indication.

Is the tail returning back to the same Spot when it twitches?
Or stay in the position it twitched to?

If the tail returns i would suspect the servo
If it is random I would suspect the gyro.

PM  EMAIL  GALLERY  Attn:RR  Quote
06-03-2012 02:12 AM  6 years agoPost 15
madog

rrNovice

Mountain View, CA USA

My Posts: All  Forum  Topic

Post a vid. Hard to diagnose like this.

PM  EMAIL  Attn:RR  Quote
WATCH
 1 page 962 views POST REPLY
HomeAircraftHelicopterGasser Model RC HelicoptersOther › Gyro or Ignition Noise
 Print TOPIC  Make Suggestion 

 6  Topic Subscribe

Friday, November 16 - 4:39 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

The RC discussion world needs to consolidate. RR is now one choice for that. Its software is cutting edge. It hosts on-topic advertising. Help RR increase traffic buy making suggestions, posting in RR's new areas (sites) and by spreading the word.

The RunRyder Difference

• Category system to allow Rep/Vendor postings.
• Classifieds with sold (hidden) category.
• Classifieds with separate view new.
• Answer PMs offsite via email reply.
• Member gallery photos with advanced scripting.
• Gallery photo viewer integrated into postings.
• Highly refined search with advanced back end.
• Hosts its own high end fast response servers.
• Hosts thousands of HD event coverage videos.
• Rewrote entire code base with latest technology.
• No off-topic (annoying) click bait advertising.
Login Here
 New Subscriptions 
 Buddies Online