Laser 28 - Excellent example of this great design Hamble le rice |
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Rossiter Pintail Mortagne sur Gironde, near Bordeaux |
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Laser 140101 Tynemouth |
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List classes of boat for sale |
Swift Solo |
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Bram ![]() Groupie ![]() ![]() Joined: 14 Jul 05 Location: United States Online Status: Offline Posts: 49 |
![]() ![]() ![]() ![]() Posted: 27 Dec 05 at 7:19pm |
Rick, I assumed that we are talking to well educated skiff sailors on this forum. I agree with you completely as long as we are sailing only in 25 knots with no gusts and no shifts and all other things are equal. My point is that a I-14 that carries a similar amount of sail area to a 49er will now beat a well sailed 49er upwind in a blow--even though it is 3 1/2 feet narrower and 2 1/2 feet shorter. It accomplishes this seemingly unlikely feat by reducing hull drag. The Swift capitalizes on a similar violation of conventional wisdom by reducing sail drag through extraordinary sail control--both shape and trim. I believe that future advances in skiff design may nearly all come from thinking outside the box. If it were as simple as more sail area, less weight, and more width, I'd be launching my Nomex /carbon single hander with 20 foot wings and 800 feet of sail soon. I believe that advances in sailing technology will come through integration—not simplification (autos are much more complex now than in the 30’s but much faster and easier to drive because of integration of sophisticated systems). Regarding righting moment: I believe that it is a two edged sword. When a 6' sailor bends his knees all the way he becomes a 4' sailor but only moves his trapping center of mass inboard about 16". If it takes 10 knots of breeze to hold a skipper flat out on the trap, a 7 knot lull will require that he move his center of mass 3 1/2 feet inboard—more than twice the distance that bending knees will deal with. In addition, he needs to move this large distance while bearing off and sheeting in to deal with the apparent wind moving forward . This assumes that his center of mass is 7 feet off the centerline (4' racks and 3' from your feet to your center of mass) (heeling moment=square of velocity rule or 10x10=100 and 7x7 =49). This is a magic trick that few can perform (moving your mass a long distances inboard while moving the sheet and tiller outboard). When I was testing the Swift rig in the 49er, I found that the boat became much easier to sail as I moved the racks inboard--even when the wind was generally overpowering. There is, of course, a limit to this theory--likely between 5'6" and 6'4" for single handed skiffs with 6'4" favoring skiffs with enough sail are to allow flat out trapping in lighter winds. In the end, most of our past theories about skiff design are being blown out (Paul Beiker and Julian should be given 40 lashes each for this trend). Actually, it’s an exciting time to be a skiff sailor and innovator. Bram |
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Bram
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Bram ![]() Groupie ![]() ![]() Joined: 14 Jul 05 Location: United States Online Status: Offline Posts: 49 |
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"Are there any plans to run production of the Solo Swift through a boat-builder in the UK?" Actually, we have a builder that is close to being certified just across the way in Belgium. I'm sure that they will complete the certification process soon and be able to take your orders. By the looks of the work they've done, they should be very good. Bram |
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Bram
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Guest ![]() Newbie ![]() Joined: 21 May 04 Location: United Kingdom Online Status: Offline Posts: 0 |
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I don't think that happens when the UK 49er fleet comes up against the I14 fleet ... I also think there are many more variables when you compare the 2 boats such as T foil rudders ... Anyway ... all the best with your project. Hope to race against one some time. Rick Edited by Guest#260 |
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49erGBR735HSC ![]() Really should get out more ![]() ![]() Joined: 30 Mar 05 Location: United Kingdom Online Status: Offline Posts: 1991 |
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One of the reasons that the 14s have been getting narrower is due to the T-foil providing extra stability so they can afford to lose width. The evolution of winged keels proved to provide extra stability through extensive testing, so the same is probably true of T-foils on dinghys.
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Ian29937 ![]() Far too distracted from work ![]() Joined: 25 May 05 Online Status: Offline Posts: 409 |
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Hi Bram, If you are going to update your site, you could also correct the error in 700 section as we also have a full set of carbon spars. Thanks Ian |
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swiftsolo.org ![]() Posting king ![]() Joined: 14 Jul 05 Location: Australia Online Status: Offline Posts: 101 |
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They also look pretty good as well!!
Edited by swiftsolo.org |
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Bram ![]() Groupie ![]() ![]() Joined: 14 Jul 05 Location: United States Online Status: Offline Posts: 49 |
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[QUOTE=Ian29937]
Hi Bram, If you are going to update your site, you could also correct the error in 700 section as we also have a full set of carbon spars. Thanks Ian Ian, I will make the correction. I'm not sure how I got this info and I apologize. Should be able to get it done tonight. If not, it'll get done tomorrow night. Bram |
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Bram
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trapper ![]() Newbie ![]() Joined: 28 Dec 05 Online Status: Offline Posts: 1 |
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Thats interesting intelegence Rick, Im sure the I-14 fleet in Seattle will be relieved to know the UK I-14's are off the pace by so much. Bram is making the point that regardless of foils or what ever other technology a narrow 14foot boat has achieved a superiority over a wider longer boat. Lets not depreciate that effort, its a huge improvement. That this doesnt occur in your patch may mean exactly nothing. Julian debued a smaller narrower 18footer which, as the experts said, couldnt have been faster, but his systems integration got him the world title that year and later. Guess we can now be assuming that Paul and the Seattle I-14 innovators are looking down that barrel too. I for one sure hope so and cant wait to get done with my share of lasers and C420/FJ's and get more time in bigger and faster skiffs. Anyone for a narrow entry T-foiled 14 hull, looking for a crew? But looking back through the posts here and elsewhere its evident that there is a common thread to the posts from some people, who post a lot/and are experts in their minds, that certain things cant be done, while Bram, at least, seems to have done them. There is such a lot of certain knowledge that 10 lbs makes such a difference, and resistance to the idea that a higher sail area to righting moment can be made to work, despite the knowledge (unless you want to call Bram a flat out liar) that the swift can be sailed well above the medium windrange for skiffs, even by an old fart. I dont think he means a novice though. Rick you sound incredulous about this in particular and are still calling for the photographic proof (although in a less obnoxious way now, after someone I saw called you on it a few months ago) and still posting that one photo of a deep stern wave lifting a musto 1/2 out of the water, a lonely white horse in the whole frame. Im sure its bloody hard to take a picture of yourself in that wind condition, maybe Bram should wait for a passing ferry to leap out of the water to satisfy you with such a snap, for what would that prove but exactly nothing if moments later the crew is teabagged and the boat comes to a catastrophic slap fest with the next trough. Perhaps your so incredulous because your know the Musto is such a handfull in heavier weather, then its just a pitty that the class rules dont allow the boats power systems to be adjusted, lowering the center of effort by splitting the sail plan (balancing the helm up and down) and changing the tip response and mainsail camber on the water,in real time, during racing, from the trap to accomodate the increased load as strawbery and bram clearly point out. Sure puts my laser and my skippers little bethwaite production boat in the antique bin and that is one that could be made easy in blow. Moreover, we keep hearing the hoary old lines like easing the jib isnt important, when skiff crews at the top have found that it is, and from one riteous expert that having a jib is no use at all. That they all tried sync'ed sails and failed, so it cant important/be done. One of our trans-atlantic buddies thinks having a assy is no use at all because of the proximity of concrete walls, whatever that means. I have heard about no breakthroughs from the new cat/canoe, a long time in gestation, and now in the water and assy boats are proving their metel, canoes and all + concrete walls. My canoe buddy thinks that following experts that keep failing is not a logical idea. Perhaps he is right and I am glad there are some real smart people like Bram and Julian who just do it and make it work. Getting the class development right is trick business no doubt, looks like the 14 have done it and the Swift Class too. Lets hope. Good luck with your project Bram (which one is that?) and with the International Swift Solo Class too. Just a as a last thought, I checked to see if these experts just keep knocking the swift when ever a thread about the class pops up, actually they habve an opinion on just about everything. Mostly all negative and delivering their superior knowledge and vast experience. Spurt = drip under pressure, X is an unknown multiplier. emough said, back to my brew and merry whatever to all. |
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bigwavedave ![]() Really should get out more ![]() ![]() Joined: 04 Jun 04 Location: United Kingdom Online Status: Offline Posts: 944 |
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Probably the most insulting ill thought out and rude post I have read on this forum. So far this forum has managed to avoid this type of reply (other than the jesting ones in banter). Have a look at the MPS site if you want more pictures. If you really have read all the other posts then you will see that the outcome when comparing boats is invariably for the owners/class associations to say 'try them for yourself then make up your own mind'. There has been some very interesting comments on this thread, with each giving their own opinions. However because you don't like/agree/understand them you resort to insults. Just because someone does not like or agree with a comment it does not mean that they are knocking it. It is a shame that your first post is in this tone, and that you think so little of your friends debating skills that you have to jump in with insults. |
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Chris 249 ![]() Really should get out more ![]() ![]() Joined: 10 May 04 Online Status: Offline Posts: 2041 |
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WARNING - VERY LONG POST
"Bram is making the point that regardless of foils or what ever other technology a narrow 14foot boat has achieved a superiority over a wider longer boat." Well, he's saying it - but has he proven it? It seems that all the people here is saying is that in other countries, 14s are not yert proven faster than 49ers. "Julian debued a smaller narrower 18footer which, as the experts said, couldnt have been faster, but his systems integration got him the world title that year and later." Errr, actually it got him the "world" title some years after the first B18 (Starboard Products) was launched. If you're going to throw insults around, check your facts first. Secondly, the 18s were then a highly-restricted class, and only Julian's hull (developed from the two-handed Primes) was designed for the smaller rigs that were introduced later. That gave it a considerable advantage over the boats designed for 22 foot+ wings and big rigs. The very big Murray "Chesty Bond"/"Prudential for Walshie" of the same era was probably the most successful 18 ever. However, no more boats of that design were allowed. Therefore the big boat/small boat confrontation was affected by factors aside from sheer efficiency. You say that there is "resistance to the idea that a higher sail area to righting moment can be made to work". Well, yes, there is. Note that the vast majority of skiff designers (well, those I've spoken to, which is most of the top ones) say that wing width and RM are vital. Paul Bieker was behind experiments that found a wider 14 would be faster. Frank Bethwaite says that "sail carrying power/total weight governs upwind performance". So you accuse us of being arrogant if we don't assume that Bram is right. But if we assume that Bram is right, we are accusing just about everyone else in the game (Bieker, FDB, Murray Burns Dovell etc) of being wrong. Ok, a well-known expert skiff designer sailed the SS a while ago and liked it. The very same expert has said that he did not believe the trap, wing and kite singlehanded skiff was the way to go for optimum speed. The same man had something very different in his workshop last time I was there. You accuse those who ask for more info about the SS of being ignorant idiots. No, we merely say that other high-performance kite singlehanders have been developed by a former Open 14 world champ, world-class Contender and Finn sailors, Moth and C Class world champs etc. Why can't we get more info on why Bram knows more than Bieker, Bucko, Clark, etc? It's interesting that when the SS came up against the Canoe at Huntington Lake, the results were conclusive - Canoes faster. Yes, the SS is still being developed, but the only world-class Canoeist was also new to kites and the other Canoeists (without spis) are mid fleet at the worlds IIRC. That's a lot of beatings for a boat that calls itself "simply the easiest and fastest sailing singlehanded skiff available". Because the SS does not hide its light under a bushel. It callls itself "the ultimate singlehanded skiff". Bram says "most of the designers were barking up the wrong tree...they're wrong". How can you accuse those who doubt the boat of arrogance, when those behind the boat are making such strident claims without proving it against top-class existing sh skiffs? How can it be OK for the SS crowd to say of other singlehanded skiff designers "they're wrong" WITHOUT having cleaned up against top-class ACs, MPS, Vis' and 700s, and then accuse others of arrogance? It seems pretty damn strange that you think it's OK for the SS guys to tell most of the s/h skiff world that "they're wrong", but you find it appalling when people dare to ask the SS guys to back up their claims. If the SS claims to be the world's fastest singlehanded skiff, then they should back it up by beating the top ACs, MPSs and 700s. If they can't, maybe they should retract claims of being "the ultimate" and "the fastest". Edited by Chris 249 |
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