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Post by colinnz on Sept 9, 2019 7:38:04 GMT
Hi all,
Need to get a new rudder. Anybody in NZ here had to replace one yet? Would the forum recommend a Jeanneau one or doesn't it matter?
Choice seems to be get one shipped over (they are in stock) or get one fabricated. Fabrication would be cheaper (about 25% cheaper) but take 3 weeks. Getting one shipped would take about a week.
Thoughts?
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Post by Zanshin on Sept 9, 2019 17:06:14 GMT
I lost my rudder on a Jeanneau 43DS and ordered a factory replacement. That took 3 weeks to deliver from France and I could have had one of similar or better quality (in terms of material strength) made locally in less time - but would I have felt comfortable with it? I opted for using a known build quality.
If you do get one made locally, is there an identical boat model on the hard that would be willing to let their rudder used for a mold?
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Post by colinnz on Sept 9, 2019 18:44:29 GMT
They can use our rudder. It is still there in one piece off the boat. The shaft is severely pitted where it goes into blade and the top of the glass is cracked in a few places indicating movement. It is the pitted shaft that is worrying though. They can use the existing rudder as a pattern I guess.
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Post by Zanshin on Sept 10, 2019 6:20:12 GMT
In my case the boat had been in an electrically active marina for a long time and crevice corrosion had set in right at the hull join where even the surveyor didn't see it. So when my rudder broke it drifted off at sea and wasn't retrievable.
Is your prop shaft pitted as well?
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Post by shawnkaplan on Sept 12, 2019 1:43:11 GMT
I find that my rudder on a 42DS seems undersized.
I’d prefer to have a new one fabricated anyway??
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Post by Zanshin on Sept 12, 2019 5:54:19 GMT
designing a rudder for a boat is actually quite complicated. I have an excellent book by Lars Larsson & Rolf E. Eliasson called Principles of Yacht Design (3rd edition) which describes all technical aspects of design and the chapter on rudders is surprisingly complex.
Thus switching to a bigger rudder needs to be thought out - just putting in some other rudder that is larger or with more surface area might cause serious issues.
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Post by rene460 on Sept 12, 2019 7:50:06 GMT
Hi Shawnkaplan, I am wondering why you feel the rudder is too small. I can’t recall any posts on that issue.
What symptoms are you experiencing?
rene460
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Post by shawnkaplan on Sept 12, 2019 9:45:24 GMT
As the wind gets to be 15+ any gust over powers her and can leave me with no steerage. Solution of course is to de-power the main, ideally by reefing. But I feel this happens too early.
Also, I have near zero steerage in reverse, even with good momentum. I end up using the bow thruster as my rudder, which is ok but feel I should get a bit more steerage from the rudder.
Compared to older boats which were meant more for sailing and less for comfort, you can visually see the size of the rudder is larger. So I just figured these 42DS is a bit undersized. If I was replacing it I might want a slight bit more while I had the chance.
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Post by rene460 on Sept 12, 2019 12:07:08 GMT
Hi again Shawnkaplan, that sounds to me like you are describing what I would call “rounding up”, which might also occur but less severely in every little gust. Does it still take a lot of wheel movement to maintain a straight line in lighter winds where the rudder can still maintain a level of control?
It will be interesting to hear what others think, but I would normally attribute that behaviour to sail shape or stretch problems. It’s very distressing when it happens. It might be worth showing some photos of the sail to a sailmaker. Take photos of the main from below the boom, looking straight up. Similar location for the jib.
If you search for “rounding up” you up you will find some threads that might be helpful.
Regarding steering in reverse, it is not possible to compare with my twin rudders and centre propellor. (I generally need nearly two knots for steerage, so need to have faith in my propellor to stop me when backing into the pen.) But I am sure others more familiar with your model will comment.
Rene460
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Post by Madicken on Sept 12, 2019 21:15:52 GMT
My 42 ds has shallow keel and therefore shallow rudder (from factory). My rudder was too shallow so I extended it about 10 cm. The keel is still deeper than the rudder. But "Madicken" is now so much nicer to sail when it's windy. Previously very often she was "runding up" a lot but now the helm has much better grip. Sure, it's about getting to know your boat and tuning it right, but now she's a better boat.
Olof
"Madicken of Sweden"
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Post by Madicken on Sept 12, 2019 21:27:29 GMT
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Post by jcoughlin on Sept 28, 2019 12:32:54 GMT
Curious how did you extend the rudder?
can you explain the process ?
Thanks,
Jim
Mainstay 7 (SO37)
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Post by Madicken on Sept 29, 2019 5:35:26 GMT
I'll try. The boat was ashore. With an angle grinder I cut about 5 cm of the rudder so that I got a smooth surface. This piece I had as a template when I made the new piece. First I formed a piece of polyurethane. Then I covered it with fiberglass and polyester. Where the old and new rudder would be put together, I sanded the surfaces and laminated them together with fiberglass strips. Then I sanded and finally new gelcoat.
I had intended to put the stud bolts but consider that if I go a ground it is better that only the new part goes off than the whole rudder is destroyed.
After 2 seasons I am very happy that I dared to do this. She sails better andalmostnever rounding up.
Hope you got a little wiser. It was stupid that I didn't take any pictures.
Olof
Madicken of Sweden
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