nexus 30 head wobble  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       

All Forums >> RC Helicopters >> Kyosho Helicopters >> nexus 30 head wobble
Page: [1]

Login
Message << Older Topic   Newer Topic >>
nexus 30 head wobble - 3/2/2008 11:10:35 PM   
shadows2013



Posts: 401
Joined: 10/13/2006
From: peterborough, NH, USA
Status: offline 		hey all , i have a newly aquired nexus 30 and i just tried to fly it but it has a nasty head wobble . The blades are new , it seemed like the shaft was bent . i removed the main shaft and it seemed to be straight ( rolled it on a table ) . I have read some where before that the 4 screw collar can cause this problem . If so then how ? it seems it just centers the shaft . How would you go about centering it ?
       Post #: 1

RE: nexus 30 head wobble - 3/4/2008 1:00:42 PM   
jetint8ke


 

Posts: 44
Joined: 3/27/2002
From: palm coast, FL, USA
Status: offline 		first make sure all the set screws on the collar are loose, then make sure that the shaft is through the bottom bearing ,aling the paddles perpendicular to the boom ,aling the mixing arms with the paddles ,put the jesus bolt in and pull up slight to get the gear mesh right and tighen the set scews,the should work

(in reply to shadows2013)
       Post #: 2

RE: nexus 30 head wobble - 3/5/2008 1:09:16 PM   
Cyberfyn



Posts: 980
Joined: 2/10/2003
From: Nottingham, UNITED KINGDOM
Status: offline 		Also make sure your head speed is not too low. Should be around 1600 on the Nex?

Ian F.

_____________________________

Very funny Scotty, Now please beam down my clothes!

(in reply to shadows2013)
       Post #: 3

RE: nexus 30 head wobble - 3/6/2008 12:14:13 AM   
shadows2013



Posts: 401
Joined: 10/13/2006
From: peterborough, NH, USA
Status: offline 		ok this may seem like a stupid question but im new to gas helis and learning as i go . ive had electric helis and theres no talk of head speed . would this be when the clutch starts to engage?

(in reply to Cyberfyn)
       Post #: 4

RE: nexus 30 head wobble - 3/6/2008 12:19:46 AM   
deckerv



Posts: 821
Joined: 5/16/2002
From: Wellsville, NY, USA
Status: offline 		Does the swashplate have a lot of play in it by chance? Been quite some time since I had a Nexus. I do however remember (think I did...lol) putting a Concept 30 swash on mine.


_____________________________

Vo Decker
AMA 117021

(in reply to shadows2013)
       Post #: 5

RE: nexus 30 head wobble - 3/11/2008 3:49:08 AM   
blvdbuzzard



Posts: 1483
Joined: 6/16/2002
From: boulevard, CA, USA
Status: offline 		You set the run out with the 4 screw in the top collar. It takes time and effort to do correctly. The plastic pitch rod guide can be molded off center as well. When I was flying mine, the plastic pitch rod guide was so bad I put a dial indicator on it and it was 16 thousands out. You need to get it down to 2 thousands or less. I ordered the aluminum one and that solved a lot of problems for me. I am not sure i you could find the aluminum pitch rod guide. It makes it easy to set the run out.


Dru.

(in reply to deckerv)
       Post #: 6

RE: nexus 30 head wobble - 5/3/2008 6:18:35 PM   
ecmiller


 

Posts: 134
Joined: 12/22/2004
From: Norwalk, OH, USA
Status: offline 		Low speed will not cause the head to wobble. With wobbley head the helicopter will shake itself to pieces before it gets anywhere near 1600 rpm which is usually the rpm required for a hover. Something is off balance and a number of things could be the culprit.

1. IF you are using wood blades, they could be twisted or warped.

2. Check your main blade pitch. Both blades need to be set exactly the same. EXACTLY THE SAME.

2. Make sure the main blades are not too tight in the grips. They should move freely with only slight resistance from the grip

2. The shaft connecting the two blade grips could be bent

3. Flybar paddles- unequall pitchy or the flybar may be bent

4. The bearing in the main gear could be bad

Generally, rolling a shaft on a flat surface is not suffient for checking straightness since only a couple of thousanths total indicatior reading can cause enough vibration to wobble the head. You shoud roll the shaft in a set of V-Blocks with a dial indicator on the shaft. I understand that most folks don't have an indicator and a set of v-blocks, but it really is the most accurate way.


Good luck.

(in reply to blvdbuzzard)
       Post #: 7

RE: nexus 30 head wobble - 5/25/2008 7:00:01 AM   
evilhorse


 

Posts: 407
Joined: 11/7/2005
From: Woodbridge, NJ, USA
Status: offline 		actually low head speed CAN cause a slight wobble, if the blades arent in their lead/lag positions they will be slightly unbalanced until they spool up. Also if your running very stiff dampers too low of a head speed will cause a wobble as well, the way to fix it is get the head speed up, maybe this doesnt apply to the Nexus, but i know it applies to my Raptor.

_____________________________

Life is short, fly HARD

(in reply to ecmiller)
       Post #: 8

Page:   [1]
All Forums >> RC Helicopters >> Kyosho Helicopters >> nexus 30 head wobble
Page: [1]





Jump to:


Google 



Search | Marketplace | Event Calendar | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

Photo Gallery | Member Video Posts | RCU Video Gallery | Instructor Search | Field|Track|Marina Search

Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

SITE MAP!   : :   FORUM RULES

© 2001 - 2007 24-7 RC, LLC, all rights reserved.

Charities we support that also need your help
Yorkie Rescue | Humane Society | ASPCA | Crohn's-Colitis America

Kaango.com Classifieds

0.750RCU1