RunRyder RC
WATCH
 1 page 885 views POST REPLY
HomeAircraftHelicopterHelicopter Main Discussion › Wag, make it stop
09-23-2013 02:36 AM  5 years agoPost 1
jason46

rrVeteran

MI

My Posts: All  Forum  Topic

I have a vision 50 comp I bought about 3 years ago and finally got it together this summer and I have a relatively slow wag at hover I can not figure out.

I have tried two different JR 770 gyros a JR 370 gyro and now I'm using a gy611, I used an s9254 with all gyros. I had about the same wag with all gyros, the 370 was a bit more pronounced.. The gy611 has been switched to a 1520 pulse and I'm using zeal tape. The rudder control rod was moved in to about 10mm on the servo horn, the tail pitch bushing has been readjusted and tail movement is smooth. On the gy611 I tried gains from 20%-37% with the same wag at all settings. In hover mode I tried raising the throttle curve about 10% around mid stick with no change. The tail shaft looks straight it is out of a "new" kit but I'm taking it to work tomorrow to find out how straight.

Assuming the tail shaft is straight, I'm open to any ideas or suggestions to get rid of the tail wag.

*edit*
I'm using Edge mains and Edge 92mm tail blades. If any other info may be pertinent to resolving this, please ask.

Thanks
Jason

PM  EMAIL  GALLERY  Attn:RR  Quote
09-23-2013 02:53 AM  5 years agoPost 2
jschenck

rrProfessor

La Vista, NE.

My Posts: All  Forum  Topic

Did you use Zeal on all three gyro's? It's a bit loose.

Try putting a velcro strap over the sensor and pulling it down a bit tight so it doesn't move much.

Are you using the optional front gyro mount plate or is the gyro mounted right above the tail transmission?

btw - I have a NIB torque tube conversion for a Competition I never installed, if you are interested.

PM  EMAIL  GALLERY  Attn:RR  Quote
09-23-2013 03:03 AM  5 years agoPost 3
Einzelganger

rrKey Veteran

Campbell, Texas

My Posts: All  Forum  Topic

I've had two S9254's go out on me. They lead up to failure with an unfixable wag.
Maybe try a different tail servo and see if that could be the problem.

Wayne

I love the smell of nitro in the morning.
RIP Roman

PM  EMAIL  GALLERY  Attn:RR  Quote
09-23-2013 11:41 AM  5 years agoPost 4
jason46

rrVeteran

MI

My Posts: All  Forum  Topic

I used various different tapes with the JR gyros with no change, started out with zeal on the 611. The s9254 was new out of the box is the odd thing..

PM  EMAIL  GALLERY  Attn:RR  Quote
09-23-2013 12:57 PM  5 years agoPost 5
jason46

rrVeteran

MI

My Posts: All  Forum  Topic

The tail shaft is straight within .0001 of an inch.

I'm using a vr5203' anybody seen issues with those.

*edit*
I've seen people tie the tail boom supports together, how necessary is this to limit vibration. The other thing I haven't tried is a gyro plate. Going to check the balance of the tail rotor assembly tonight.. Might start looking for another tail servo.

We made up some rules can we have your moneys now.

PM  EMAIL  GALLERY  Attn:RR  Quote
09-23-2013 01:32 PM  5 years agoPost 6
Richardmid1

rrProfessor

Leeds, England

My Posts: All  Forum  Topic

Are you sure the tail pitch machanics are smooth and almost friction free with little to no free play?

How are the tail grip bearings? It might be worth taking the thrust bearings out, cleaning them and regreasing them.

Boom supports come loose maybe?

60% of the time, it works every time!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
09-23-2013 02:53 PM  5 years agoPost 7
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

My Posts: All  Forum  Topic

i've had dry thrust bearings in the tail grips cause a slow wag. have you inspected/repacked?

if it ain't broke, break it.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
09-23-2013 03:33 PM  5 years agoPost 8
Dalieo

rrApprentice

SW FL

My Posts: All  Forum  Topic

How does the engine sound when at idle. Do you hear a lot of bearing noise?

It is possible that rough bearings can cause a wag and or tail vibration. How is the tune on the engine? A bad tune will cause wags as well.

PM  EMAIL  GALLERY  Attn:RR  Quote
09-24-2013 03:35 AM  5 years agoPost 9
jason46

rrVeteran

MI

My Posts: All  Forum  Topic

Tail pitch movement is smooth, I took the slider apart again while I had the tail apart and discovered one of the bearings is "notchy", not sure if I missed this or a new occurrence, plan on replacing it but I'd be amazed if it were the whole problem.

-Boom supports are tight.

-Tail grip bearings and thrust bearings are good, applied some fresh grease.

-The engine is a 50sx-h that was used, I disassembled the whole engine down to the rod clips and it is good. I'd like to think I'm pretty good at tuning engines, maybe a bit rich, but I'm not real familiar with this size/type.. Runs and starts well.

Thanks for the help, plan on getting the tail as perfect as possible and try a gyro plate with the 3m gel tape, I've never tried a plate so I'm curious on the effect. Dying to fly this thing.

PM  EMAIL  GALLERY  Attn:RR  Quote
09-24-2013 10:45 AM  5 years agoPost 10
Richardmid1

rrProfessor

Leeds, England

My Posts: All  Forum  Topic

A notchy tail blade grip bearing can totally cause a slow wag. Under the huge centrifugal forces the tail will struggle to find the perfect pitch position when hovering as the bearing drops in and out of that notch.

60% of the time, it works every time!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
09-24-2013 11:10 AM  5 years agoPost 11
jackp332

rrKey Veteran

Claremont, Nh USA

My Posts: All  Forum  Topic

I had this same problem with my gy401/9254 on my gasser. I found the foam tape futaba supplied was simply to soft. A switch to 3m cured my slow wag/drift.

PM  EMAIL  GALLERY  Attn:RR  Quote
09-24-2013 12:46 PM  5 years agoPost 12
Andy from Sandy

rrElite Veteran

Bedfordshire, UK

My Posts: All  Forum  Topic

The problem with my model when it had a wag was getting loctite on the dog bone links that go from the slider to the blade grips.

Moving the tail with the servo still connected and I couldn't feel anything. Disconnecting the rudder servo and moving the slider very slowly with a gentle touch I could feel a point where it stuck.

If the gyro mount were causing the problem I would think it would be vibration related and the model would be more inclined to drift round if not corrected.

I now put the loctite in the hole and not on the screw and make sure the mating surfaces are clean by wiping with a tissue.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-05-2013 03:38 PM  5 years agoPost 13
jason46

rrVeteran

MI

My Posts: All  Forum  Topic

I played with the rudder linkage quite a bit, rebuilt the tail numerous times, the tail is "intimately" smooth now.

I'm almost ashamed to admit it, the whole problem was the carb was a bit rich. Leaned it in some more yesterday and bam, perfect flying heli.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-05-2013 05:10 PM  5 years agoPost 14
Einzelganger

rrKey Veteran

Campbell, Texas

My Posts: All  Forum  Topic

Good to hear you found the prob!
The harder you try and the longer it takes, the better it is when you find it. A side-effect of your situation, is you know that EVERYYTHING else on the bird is perfect now.
Now, don't do like I do and get cocky and crash and start all over!

Wayne

I love the smell of nitro in the morning.
RIP Roman

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 885 views POST REPLY
HomeAircraftHelicopterHelicopter Main Discussion › Wag, make it stop
 Print TOPIC  Make Suggestion 

 6  Topic Subscribe

Saturday, November 17 - 4:54 am - 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