Sigma 41
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Have been meaning to congratulate you on the photos - looks like a really good trip. When are you likely to be in the Caribbean? as we expect to be in Antigua by Christmas. Afraid I can't help with the packing size as we have a manecraft seal! Roger
Could it be possible to cut off the standard keel and fit a lead "torpedo"? Would this be capable of being as structurally secure as the "standard" keel? I seriously doubt it. I have given thought to the depth/stabillity/structural endurance problem. A hydraulic partly lifting dagger board has been researched, and design/ engineering considered. Sufficient to say that it is possible,but will seriously intrude into the saloon, (just aft of the mast) ,require major structural work to support the dagger board case, give an even more hopeless ORC rating almost certainly wiping out any performance improvement, and cost an unjustifyable sum of money. Whilst the wing keel is good for cruising, it does compromise the windward performance of the yacht. All things considered the standard original keel is best. you just have to live with 2.3m draft. Having practised on the 41, the designer nearly solved this problem for the 38.delightful to sail upwind, but not nearly as wonderful as 41 offwind, nor as seaworthy.
Allen 
Allen 
My Sigma 41 "Dorothea of London" (ex "Big Doris", ex "Sunbeat") has been in the Caribbean for a while now, laid up in Trinidad in the summer. We have been cruising the islands from there and will again next winter before moving up the East Coast of the US. Will look out for you. Adrian
I've added a picture of my fractionally rigged 41, 1984, "INTERLUDE". I had her barrier coated, awlgripped, the keel re-bedded and some of the bilge stringers reinforced this past summer. I'm looking to repair/re-affix some of the teak deck this Spring and reupholster the interior. Question to all, at one point someone referenced an interior layout of the cabin (plan view). I can't seem to find it as I make my way through the postings. I'm interested in getting measurements for ordering foam mattress and fabric. Thanks! Rick
Thanks a lot for the photos and the reply on my inquiery. Maybe You havn´t seen the orginal keel., the top piece is cast iron weight aprox. 2700 kg. and the leadshoe is 0,5 m high and weighs aprox. 1025 kg. and it`s bolted to the iron with stainless steel bolts treaded in the iron. I have copys of the original keeldrawings. I have talked to two Swedish yachtdesigners, and to solve my problem, they recomend me to cut off the whole leadshoe and cut it to pieces and put the lead under the floorbards ( it`s only 100 liters) and sail like that for a summer, than I can decide if I need more weight further down. I`ll let You know how it works and once again thanks for Your kindness. Lasse
Yes I am familiar with the original keel design. A rough calculation for your keel plan, (1025Kg moved from bottom of keel to in bilges ballast,) gives over 40% reduction in "righting moment". I can't quickly calculate the reduction in "vanishing angle of stability" but suspect this will show an unacceptable safety margin. Strongly advise that professional yacht designer should fully calculate and design any such modification. The wing keel was designed by David Thomas to keep the righting moment the same as for the original deep lead/iron keel, thus maintaining the stability and safety. The reduction in performance with the wing is not noticeable when cruising. When racing, the extra weight combined The less efficient hydrodynamic performance of a wide shallow keel compared to a narrow deep keel is not compensated in the ORC rating. In fairness, it was always expected that the wing keel would produce a "cruising version" of the 41. This doesn't solve your problem. I regret there is no easy answer that will be as safe or seaworthy as the existing.It would be a huge risk to try what you have suggested without more design input.
Hello, I'm a potential boat owner, and one of the nicest boats I've looked at so far has been a Sigma 41. However, I will be new to boat ownership, and I'm worried that this might not be the most trouble free entry into the club. On the other hand, I'm really impressed with the layout, I love the lines, I think I could use it as a liveaboard, or to cruise in comfort fairly long distances with two couples, or to do a bit of "fun" racing if there is such a thing. So, I guess I might be asking a slightly biased group here, but: should I buy a Sigma 41, or a Jeanateau First Fast Oceanodyssey 37? Joey Adverts Currently On Preloved - Place an ad here for free
Boats are wonderful, buying boats is great, there's nothing better than boating! I've got one summer sailing the 41 (1984), in addition I had a survey for purchase consideration on a Benneteau 38 (1992). There is very little comparison between the two boats. The 38 is a production boat with some engineering/ergonomics/technology that presents itself very well. The one I perused had many "single handing" features like batcar batten system on main, all lines from mast led under false deck to cockpit and a nice step/drop transom. It also had a wing keel which reduced the draft considerably. All in all a good boat. However, the differences in strength, beam, draft, standing rigging and sea berths indicate one boat that is much more tender, less capable sailboat with some nice amenities. The Sigma is a big boat. A wonderful big boat that has a much nicer set of "bones" and has considerably more years of usage ahead of it. One problem that appeared on the Benneteau I looked at and that was the determining factor for not purchasing the boat was a fair amount of crazing just above, at and just below the waterline. If you read some of the forums regarding the French boats (and others as well), that many of these crazy issues relate to poor/brittle gelcoats and cold temperatures. The fix isn't cheap and not guaranteed to return. I felt it was more of an issue of a quicker depreciating asset than the Sigma which has many more miles/years has no crazing on the gelcoat. When you're at the helm of each boat, they give you amazingly different feelings as you gaze to the horizon!! Good luck!
Can anyone tell me how many were built ? In reply to Joey, You will find it very difficult to find a 41 foot boat that has such a high stability rating for worldwide saiiling and at a reasonable price tag as the Sigma 41 I have sailed around 40,000 nm in 15 years in my 41 age doesn't matter great to sail and easy to work on...and on ...and on... yes! just a little bit biased
Where in Scotland are you? We(Restless) are based on the Clyde but are spending summer at Ardfern Jim
If you want one of the most seaworthy yachts of it's size, then the sigma41 still has few equals,especially at the current prices.It sails with all the characteristics of a much larger boat whilst retaining a really agile response and great sailing "feel".Of course I'm biased, owned "Medmerry" for 15 years, sorry no intention of selling her: couldn't buy her equivalent new under £350,000, and there is still 25 more years in her at least.How much you "update" is a matter of choice and size of wallet, suffice to say you will always have something worth spending your cash on. Good luck with your boat hunting.
Rick, I'm just going through the reupholstery process myself and have measured each cushion. Send your e-mail address to me at tomatsperreydotnet and I'll send you the dimensions. Tom.
You will find the Hull number on the opposite side of the transom to the stamp you mentioned - the yard used the prefix J 10 for the 41 hulls, for instance Candida is J1049 i.e. hull nr 49 delivered November 1984 Roger
Hopefully you received a message from me tonight via your email address. If not please let me know and I'll try again! Thanks, Rick 
Thanks for all of the responses guys. Rick, Savitar, Allen I think you have helped me to persuade myself that this is the way to go. Now I need to find the boat does anybody know the Sigma 41 for sale in Swanwick Marina?
I think this boat was based in Ireland until last year We met her in Port Tudy, Ile de Groix in June last year - we were head North they were headed South - but unfortunately didn't get a chance to talk much. Think it was an all male crew Rogedr
Roger, Her name is Sarah Mercedes, I've done some more digging and it looks like she did the Round the Island a couple of times in 2001 and 2003, it doesn't look like she's had a lot of use recently. Joey
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