Return to Hobie.com
Hobie Forums
It is currently Mon Mar 18, 2024 8:53 pm

All times are UTC - 8 hours [ DST ]




Post new topic Reply to topic  [ 8 posts ] 
Author Message
 Post subject: Rudder arms
PostPosted: Sat Oct 09, 2010 6:13 pm 
Offline
Site Rank - Captain

Joined: Sat Nov 07, 2009 10:52 pm
Posts: 110
This is a bit silly. I started reassembling my rudders and noticed one of my rudder bars was 2" shorter than the other. I can't claim credit for that, but it has taken me a long time to notice.
Anyway, could someone please measure their bars (tube end to tube end) so I know which is correct?
Many thanks...


Top
 Profile  
 
 Post subject: Re: Rudder arms
PostPosted: Mon Oct 11, 2010 11:59 am 
Offline
Site Rank - Old Salt

Joined: Mon Sep 20, 2004 12:36 pm
Posts: 788
Location: Tri-Cities, WA
I'm not sure which would be correct, but it will be much easier making the long one shorter than visa versa. :wink:


Top
 Profile  
 
 Post subject: Re: Rudder arms
PostPosted: Mon Oct 11, 2010 3:22 pm 
Offline
Site Rank - Captain

Joined: Sat Nov 07, 2009 10:52 pm
Posts: 110
Yes that was an option, but the arm is pretty frozen at both ends. And I would prefer the longer arm if I can make it work.


Top
 Profile  
 
 Post subject: Re: Rudder arms
PostPosted: Mon Oct 11, 2010 3:39 pm 
Offline
Site Admin

Joined: Tue May 27, 2003 12:44 pm
Posts: 15021
Location: Oceanside, California
Ok... I'm confused.

Quote:
but the arm is pretty frozen at both ends


Tiller arm or tiller crossbar?

_________________
Matt Miller
Former - Director of Parts and Accessory Sales
Warranty and Technical Support
Hobie Cat USA
(Retired 11/7/2022)


Top
 Profile  
 
 Post subject: Re: Rudder arms
PostPosted: Tue Oct 12, 2010 4:50 am 
Offline
Site Rank - Captain

Joined: Sat Nov 07, 2009 10:52 pm
Posts: 110
Sorry Matt, I'm on the other side of the world...

Out of each upper rudder casting emerges a pipe/tube, and these are connected by a cross bar. It is these pipe/tubes that are different. Straight ahead not much of an issue, but as soon as the tiller changes the blades are no longer parallel, hence my wish to correct the problem.

The easy way is to make them both short but the long one is frozen in tight at the rudder end, and the cross bar end is also locked in tight. I don't want to destroy it. Anyway I would prefer the longer option. My question to the Forum was which is the correct length - 450mm or 500mm?

Cheers, Hendo


Top
 Profile  
 
 Post subject: Re: Rudder arms
PostPosted: Tue Oct 12, 2010 8:59 am 
Offline
Site Admin

Joined: Tue May 27, 2003 12:44 pm
Posts: 15021
Location: Oceanside, California
Fyi... as the rudders turn, they should not be parallel. This is due to a designed-in feature called "Ackerman". The inboard rudder turns sharper than the outboard one which allows a tighter turn with less rudder drag. This Ackerman effect is created by the tiller arms bend inboard towards each other... not tiller length differences.

Side note: Wave and Getaway using EZ Loc rudders do not have Ackerman due to a design issue with the plastic rudder housings which doesn't allow for bend in the tiller arms.

As far as the tiller arms being different lengths... I'd also suggest shortening the longer of the two. Seems the simple solution.

_________________
Matt Miller
Former - Director of Parts and Accessory Sales
Warranty and Technical Support
Hobie Cat USA
(Retired 11/7/2022)


Top
 Profile  
 
 Post subject: Re: Rudder arms
PostPosted: Tue Oct 12, 2010 11:12 am 
Offline
Site Rank - Old Salt

Joined: Mon Sep 20, 2004 12:36 pm
Posts: 788
Location: Tri-Cities, WA
Thanks Matt, Ackerman effect eigh, I wondered why the offset on the tiller arms, makes sense. Years ago I accidently reversed my rudders when setting up my boat. Fortunately it was pretty obvious when I connected the cross arm and was corrected before hitting the water. :)


Top
 Profile  
 
 Post subject: Re: Rudder arms
PostPosted: Tue Oct 12, 2010 7:31 pm 
Offline
Site Rank - Captain

Joined: Sat Nov 07, 2009 10:52 pm
Posts: 110
Thanks Matt, that is interesting. I understood that there was a difference between hulls in a turn but never heard of Ackerman....


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 

All times are UTC - 8 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Jump to:  
© Hobie Cat Company. All rights reserved.
Powered by phpBB® Forum Software © phpBB Group