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Rudder bearings

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holby View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote holby Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2021 at 12:00
hi Andrew… 
I have done a few pages on machining my own rudder bearings… my rudder shaft was also worn and how I got around this..
My bearing war NOT roller bearings but a polymer bearing.. the post covers the material I used and what I did.. it turned out to be be a simple DIY job if you either have a lathe or know somebody with a lathe…
Hanse 301, tiller steering, Volvo 2010 (10hp)
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perry View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote perry Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2021 at 12:35
Ive been away sailing. So appogies for late reply.

I feel I have to say I completely agree with Taylor [bluenote11] .  I did the long Delrin sleeve to overcome the problem on my 301 Bloto. This was essentially to placate a surveyor, honestly rudder play of 1mm is not a big deal.
The surveyor was completely on board with my longer sleeve bearing and sign off on it. I subsiquently sold the boat and the new owner is happy over the last year.

If you must splash the cash with Jefra, and as you will have to glass in new rudder tube,  my option would be to buy one of their 'racing' rudders with Duplex Stainless Steel rudder stock of smaller diameter than the Aluminium and the thinner NACA aerofoil section. Less drag and Duplex SS great in sea water, strong stuff,  no worries on using copper antifoul, no corrosion!
Current Yacht Hanse 315 2007
Last Yacht Hanse 301 Round GB in 2017
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holby View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote holby Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2021 at 16:09
Perry, I didn’t know you had sold Bloto, or if you had it’s obviously my mind is going.. what have you got now? 
Take care mate.. 👍
Hanse 301, tiller steering, Volvo 2010 (10hp)
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Alexmass View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Alexmass Quote  Post ReplyReply Direct Link To This Post Posted: 22 October 2021 at 13:32
Polymer bearings are not the best. Although there are good options
I am certainly not the greatest specialist in materials science, but lately I have often read literature about yachts and boats.



Edited by Alexmass - 26 October 2021 at 00:52
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holby View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote holby Quote  Post ReplyReply Direct Link To This Post Posted: 22 October 2021 at 14:20
Originally posted by Alexmass Alexmass wrote:

Polymer bearings are not the best. Although there are good options

Disagree, by using a material called vesconite you will find that many large container ships, and other large ships are converting over to vesconite.. 
unlike nylon, which swells massively in water, vesconite does not, it’s expansion is so minimal it is negligible.. it’s easier to machine to the right size… 
I have now made both bearings, the top and the bottom, out of vesconite. I have no financial connection to vesconite, but have been in the polymer design industry for just over 20 yrs.
Cheers.
Dave 
Hanse 301, tiller steering, Volvo 2010 (10hp)
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RichardJ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RichardJ Quote  Post ReplyReply Direct Link To This Post Posted: 25 December 2021 at 16:30
We just lifted Oh Dream Tiger (formerly Bloto) out for a winter refit. There’s a lot more than 1 mm play in the rudder now. We’re going to have to have a look at it. 
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perry View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote perry Quote  Post ReplyReply Direct Link To This Post Posted: 25 December 2021 at 19:01
I made a double length bearing in Black Delrin for Bloto in August 2020 to overcome the wear on the bottom 60mm of the aluminium Rudder stock. This was a design approved by your experienced marine surveyor, the play at the bottom of the rudder may be approx that 12mm.
Let me know how you progress. If you need to remove bottom bearing dont go for sledge hammer approach; I fitted it with lots of Sikaflex 291. You need to use serious big puller system to get it out,  using 12mm studding and a big pad to spread load on bottom of hull or you will damage the hull moulding. And I used a 12mm thick alluminium disk to push the bearing down.
Regards Perry



Edited by perry - 26 December 2021 at 13:45
Current Yacht Hanse 315 2007
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holby View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote holby Quote  Post ReplyReply Direct Link To This Post Posted: 25 December 2021 at 22:04
RichardJ, interested you say, a lot more than 1mm, how much play is in the rudder? 

Edited by holby - 25 December 2021 at 22:05
Hanse 301, tiller steering, Volvo 2010 (10hp)
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Taylor View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Taylor Quote  Post ReplyReply Direct Link To This Post Posted: 26 December 2021 at 12:37
Originally posted by holby holby wrote:

RichardJ, interested you say, a lot more than 1mm, how much play is in the rudder? 

 
I also find it a bit strange given how recently they were replaced.

If the hinge pin to the tiller is loose you can get a lot of play in the steering as the tiller bracket moves a big angle in relation to the rudder shaft.

Steve
Hanse 301 Bluenote 11
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RichardJ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RichardJ Quote  Post ReplyReply Direct Link To This Post Posted: 26 December 2021 at 16:52
Thanks Perry. We plan to have a good look sometime in January when both Sean and I are free. One of the pains of being 2+hours (on a good day) from the boat
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