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blaze720
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Joined: 28 Sep 05 Location: United Kingdom Online Status: Offline Posts: 1635 |
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Topic: DesignersPosted: 13 Oct 11 at 11:25am |
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Nothing wrong with self-draining double bottomed boats - it is much more about the amount and distribution of buoyancy, particularly in the cockpit area. The wider the boat the more critical this distribution becomes as well. It is just as easy to make a case for boats that don't self-drain adaquately being more prone to capsizing in the first place as their 'cargo' of water hardly helps ! Yes I know bailers can help, but not always. .... and if they are righted and remain half-full they are very much easier to capsize again ... and again.
I cannot be the only one who has seen the rig ripped right off righted Enterprises etc as they streugle to get the transom flaps doing a decent job while lugging a ton or so of water around. Particularly so in gusty conditions. Mike L. |
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tickel
Far too distracted from work
Joined: 21 Dec 05 Location: United Kingdom Online Status: Offline Posts: 408 |
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Posted: 13 Oct 11 at 11:44am |
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Our Taser did not have a double bottom but almost always inverted. It was a real pain. Someone on this forum told me that it was designed that way so that it would not blow away....well it did anyway unless the expensive mast was stuck in the glue at the bottom of the lake. I am surprised that no one has mentioned the illustrious Lark. It rolled over easily, came up swamped and took ages to drain particularly as there was never just one capsize. British industry would not be in the decrepit state that it is to day were it not for Larks drowning all those promising Captains of industry while they were still students.
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tickel
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olly_love
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Joined: 18 Jan 05 Location: United Kingdom Online Status: Offline Posts: 1145 |
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Posted: 13 Oct 11 at 11:50am |
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sorry i ment boats with no airpocket you will be thrown clear, there isnt much of an issue with an inverted boat blowing away from you, even the B14 on its side doesnt blow fast, as the rig creates so much drag and the underwater wing stops is moving, like a sea anchor, the sam goes for anyboat when capsized, the main issue with blowing away is if they roll back on you, |
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TWO FRANK-Hunter Impala
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JimC
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Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6662 |
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Posted: 13 Oct 11 at 12:02pm |
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I know from personal experience that both ICs and old school Cherubs with side tanks blow downwind faster than I can swim when capsized and on their sides.
Twenty years ago I had a Cherub with a sealed topmast on its wing mast, and that shot off downwind aat a very impressive speed: there was so much buoyancy that jib and kite halyard sheaves were clear of the water. Losing contact with that boat in the middle of the Solent was a very nasty experience - she even managed to be blown upright by the wind and head off downwind even faster... Many thanks to these folks... Drop a couple of quid in the tin every time you pass them... http://gafirs.org.uk/homepage.html Edited by JimC - 13 Oct 11 at 12:03pm |
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oldarn
Far too distracted from work
Joined: 10 Apr 07 Online Status: Offline Posts: 440 |
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Posted: 13 Oct 11 at 12:31pm |
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May be Mike, the Blaze, and as Olly says the B14, that are the only two double bottomed self draining boats that don't turn turtle! Mike, perhaps you are the only person who has seen the rig ripped off an enterprise. Sounds like rotten wood to me. |
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thefastexcitingrunningasymmetric
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alstorer
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Joined: 02 Aug 07 Location: Cambridge Online Status: Offline Posts: 2899 |
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Posted: 13 Oct 11 at 12:46pm |
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B14s can turtle, but generally only if you hang on the wing as they go over...
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-_
Al |
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olly_love
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Joined: 18 Jan 05 Location: United Kingdom Online Status: Offline Posts: 1145 |
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Posted: 13 Oct 11 at 12:49pm |
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i never said it wouldnt go turtle, just said it wouldnt drift down wind, |
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TWO FRANK-Hunter Impala
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Medway Maniac
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Joined: 13 May 05 Location: United Kingdom Online Status: Offline Posts: 2788 |
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Posted: 13 Oct 11 at 1:10pm |
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No, it isn't the double bottom that's the problem, it's the excessive side-tank buoyancy that makes many boats float too high, as Jim suggests. When the L2k and latest Wayfarers capsize, the double bottom doesn't even get wet - the side tanks hold it clear of the water!
Note that i'm talking about the latest Wayfarers. The old MkII's and Plus 'S' had no side tanks and floated nice and low on their sides; you could easily slither, seal-like onto the board and even a skinny individual like me could right the boat. Of course, they were full of water when they came up, but needed only the addition of a double bottom (and corresponding reduction of bow and stern tank volumes) to make that a non-problem. Owing to the volume distribution in such a double bottom, the boat would still sink pretty low on its side before the buoyancy of the double bottom stopped it sinking further, so there would be no great tendency to turtle and the centreboard would remain well within reach. |
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oldarn
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Joined: 10 Apr 07 Online Status: Offline Posts: 440 |
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Posted: 13 Oct 11 at 1:46pm |
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Is a good dinghy design a boat that can be sailed in wind up to f7 and in fairly rough seas. That is the condition the early I14s might sail in, without decks and no self bailers. Doesn't self draining and double bottomed cover for bad design and or bad sailing!
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thefastexcitingrunningasymmetric
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Rupert
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Joined: 11 Aug 04 Location: Whitefriars sc Online Status: Offline Posts: 8956 |
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Posted: 13 Oct 11 at 1:51pm |
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Only if that was the design brief - a boat designed to sail in light winds and flat water might be an excellent design, but not cope at all in the conditions you describe. |
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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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