Sigma 41
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We replaced the Bukh on Candida last year - a fairly sytraightforward job - although we had to slightly modify the bearers - we also kept the engine forward in the box, and as it is shorter than the Bukh we put on a new shaft (old one was past its best!) Others have replaced with a Beta engine I believe - if you look back to early pages on the discussion 2-4 I think you will some chat. PS the Yanmar is quieter and about 120 kos lighter than the Bukh Roger
We replaced our Bukh with a Yanmar 3JH3 in early 2002. The only serious problem with the 3JH3 is that you have to be a contortionist to change the water pump impeller, but it appears that problem may have been fixed on the current model, which is 3JH4, I think. We love the Yanmar. Its quiet, fuel-efficient, smoke-free, and except for the impeller, not too hard to perform routine maintenance on. And you can get parts everywhere. With the light engine, we are a little down by the bow, but that seems to be OK. In light air I think it helps, especially off the wind, and in heavy air we just move the crew back. We have sailed Shawn and Victorias BLACK ADDER, which has a new Beta in it, and it was great. Quite, smoke free. Its a little more powerful that the Yanmar, but we have not missed the extra power. Repowering with a new Bukh is by far the cheapest way to go, but as Roger says, they are noisy and heavy. On the other hand, they are almost bulletproof if you change the zinc frequently. (Not completely bulletproof; we sucked eel grass into the water intake and fried the engine because we did not have an overheating alarm.) Be sure you experience changing the oil on the Bukh if you are thinking about a new Bukh. It seemed that an eyedropper would have been the best way to get the new oil in. Perhaps someone who lived with a Bukh longer than we did knows how to get the oil in. Also, as best we can tell, there is no way to get the head off the Bukh without removing the engine from the boat, and that requires cutting away the companionway ladder. The Sigmas are great boats. Powerful, strong, fast, a delight and a challenge to sail, built like a brick outhouse without being too heavy, and you eventually get tired of people asking you if its a Swan, at least here in the U.S. We now have a rule that after three such inquiries in one day, we starting saying, Yes. It has excellent sea berths in the middle and cruising/port berths in the ends. Ours has a Southern California extra tall rig, which isnt the best idea on San Francisco Bay, and it has penalty spinnaker pole, but nevertheless, we race it occasionally, and it brings home its share of silver with a PHRF of 87. Good luck. Ted Keech
Cockpit is laid teak planks. Deck not sure, but looking at the arrangement of dowels/plugs would suggest individual planking. However, instead of a full caulking gap (which is harder to fit) they rebated one edge to approximately 3-4 mm (hence looking like it is laid on ply). I think this is why there is such a problem with the deck as this method never allowed the caulking to go completely through, allowing areas of the deck to contain water and not dry. If it's up would suggest relay with new, the labour is the most expensive part of the deck! Again really recommend KJ Howells, Cobbs Quay, Poole for Teak supply. Also, sections of the cokpit we had just peeled off once unscrewed as the caulking/bonding seems to have not been prepared properley from new. Now corrected. Roger, your thoughts? Cheers now. Shawn
I have been talking to people "in the trade" and as Ted says these decks are supplied and fitted as modules.I.E. cockpit seats and steps etc.. the deck is supplied in several modules.Seperate planks ara fitted to a semi rigid membrane which is then bonded to the under deck with screws and dowels. Individual planks can be lifted and refitted but the underside of the plank has two rebates to make a male/female join to the membrane making planks too thin to do much with. It looks like a renewall job. Jim
Want to thank everyone for their input. I recently went back and did another "kick the tire" on the Sigma 41 I looked at last fall. The boat is hauled now and is on the hard. Unbeknown to me when I last looked at it is that it has a bulb keel fitted in place of the original (fitted poorly I think with water weeping through a crack). The broker then informed me that the original keel had been damaged and replaced with the weighted bulb. After measuring the draft it appears that the only difference is an inch shorter - nothing significant as far as draft is concerned but maybe as far as performance. Still mulling over this one. Carl
Maybe the iron bulb has been fitted to the lead section on normal keel thus the bulb to compensate for weight. Is the split running fore and aft about 14"from foot of keel Jim
The deck may well be in Modules but I can assure you that Black Adder has a laid, plank by plank, teak deck in the cockpit If you look at the seat pattern you will see the planks are not perfect and custom fitted, i.e. the pattern differs, dependant on who was fitting it! Shocking really. The plug my boat came out of was certainly not symmetrical and as a result when relaying do not rely mirror imaging the seate and then allowing a slot for the locker. Still could be a later boat and better prepped. Cheers now Shawn
Sigma 41 keels all have a lead shoe for the bottom 18" or so - so that shoiuldn't be a problem - maybe just a matter of tightening up the boltd joining the two sections. Another area of weakness is at the front where the fin meets the plate securing it to the hull - on grounding the hull will flex and you may find cracks in the plate at that point - we had this and had the keel off. Frankly its not too serious , and on refitting we just 'nipped' the front two bolts which are fitted through the mast step and tapped into the flange only. The remaining bolts that are tapped into the fin are more than capable of holding the keel. So dont worry too much - but its a useful bargaining ploy! Roger
I dont mean it is not indiviually planked as such, Scotfree seats are the the same i.e. they dont match. But they have been individually made up and laid as a one on the locker. Jim
If I were in your shoes, I would like to know who did the engineering of the bulb and what the relative weight of the bulb and density of the bulb are compared to the original shoe. I would be concerned that if the weight or density is greater, the keel attachment structure might get overstressed, and if either is less, the boat might be too tender. I keep telling my wife that what we really need is a hydraulic canting keel a la the Volvo 70's. Yeah. Ted Keech
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Think I understand, if you want to have a chat about what we found I can give you a number, my email [Log in to view email] Also have some photo's of the cockpit teak on and off. Fowey Regatta Week Anyone coming to Fowey Regatta Week Fowey is our home port and if we have enough boats I am confident we can persuade POFROC to have a Sigma 41 class. The week is a great event, happy to sponsor some prizes (bottle of whiskey and maybe we could then discuss in more detail the forming of a class association and niggles and problems and we overcame them. Could even have a prize for who sailed the furthest to get there. It is usually great racing although last year the winds were a little light! Sunburn being the major obstacle. Sigma 41 keel Have some photo's of keel off if interested Carl, my keel leaked due to poor seal between the keel and hull, caulking was a white compound that just didn't cut the mustard, previous owner used caulking thread around the keel bolts to prevent water ingress, but we still always had water in the boat. Hopefully dry this year as we used sikaflex this time. Roger on Candida is the guru on keels though. Cheers now! Shawn. Shawn.
I've managed to acquire some hull drawings, one is a hull cutaway to show berths etc the other four show the stringer plan and some transverse sections at various points. I was hoping to get deck core info but little is shown. Anyway if anyone wants a copy I have them on disc and can email them to you. The files are are about 750kb each, if thats too big I could try and compress them or maybe send you a [Log in to view email]
Have you noticed that there seems to be no deck coring where there is teak decking? I think this is the case, and it is a feature I think is great. Ted Keech
Mine appears to haver no core. :-) Also, why the fridge capacity? Just replaced the compressor and cooling plate on BlackAdder. Cheers now. Shawn!
David Intrigue.
I would very much like to have the drawings of the hull etc that you seem to be able to send. My boats name is "Sunbird", formerly English owned, bought in the Med (Turkey) and sailed to Norway. Regards Patrick
Jasså da er vi to i Norge. Hvilken båt kjøpte du? Er du fornøyd? hvilke planer har du? Jeg kjøpte min båt for 5 år siden. Hadde den i middelhavet, men nå er den seilt hjem. Hadde vært fint å se den på sjøen - hvor ligger du? Jeg ligger i Oslo. Patrick
We have redone the caulking and reset many of the screws on FAYAWAY's teak. A miserable job, and awfully expensive if you pay someone to do it. We also have the long screws that show rust from leakage, but by keeping after the bungs I think we have minimized the leakage. At least what leaks isn't rotting a core or traveling through it.
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