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Rudder bearings |
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holby
Admiral of the Fleet Joined: 18 February 2006 Location: Isle of Man Status: Offline Points: 2287 |
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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…
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Hanse 301, tiller steering, Volvo 2010 (10hp)
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perry
Captain Joined: 13 October 2015 Location: IOW Status: Offline Points: 268 |
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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!
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Current Yacht Hanse 315 2007
Last Yacht Hanse 301 Round GB in 2017 |
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holby
Admiral of the Fleet Joined: 18 February 2006 Location: Isle of Man Status: Offline Points: 2287 |
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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.. 👍
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Hanse 301, tiller steering, Volvo 2010 (10hp)
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Alexmass
Sub Lieutenant Joined: 22 October 2021 Status: Offline Points: 2 |
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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
Admiral of the Fleet Joined: 18 February 2006 Location: Isle of Man Status: Offline Points: 2287 |
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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
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Hanse 301, tiller steering, Volvo 2010 (10hp)
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RichardJ
Sub Lieutenant Joined: 16 August 2020 Location: Hamble Status: Offline Points: 14 |
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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
Captain Joined: 13 October 2015 Location: IOW Status: Offline Points: 268 |
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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 |
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Current Yacht Hanse 315 2007
Last Yacht Hanse 301 Round GB in 2017 |
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holby
Admiral of the Fleet Joined: 18 February 2006 Location: Isle of Man Status: Offline Points: 2287 |
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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 |
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Hanse 301, tiller steering, Volvo 2010 (10hp)
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Taylor
Captain Joined: 02 December 2013 Location: North Wales Status: Offline Points: 178 |
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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
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Hanse 301 Bluenote 11
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RichardJ
Sub Lieutenant Joined: 16 August 2020 Location: Hamble Status: Offline Points: 14 |
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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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