Laser 28 - Excellent example of this great design Hamble le rice |
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Laser 140101 Tynemouth |
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Laser 161752 Tynemouth |
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davidyacht ![]() Really should get out more ![]() Joined: 29 Mar 05 Online Status: Offline Posts: 1345 |
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Graeme will no doubt point to the Mistral Challenge Flex ...
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Rupert ![]() Really should get out more ![]() Joined: 11 Aug 04 Location: Whitefriars sc Online Status: Offline Posts: 8956 |
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BANG!!!!!! |
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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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iiitick ![]() Far too distracted from work ![]() Joined: 04 Jun 14 Location: gb Online Status: Offline Posts: 478 |
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A bowstring from stem to stern, tighten it for increased rocker!
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Strangler ![]() Posting king ![]() ![]() Joined: 24 Mar 06 Location: United Kingdom Online Status: Offline Posts: 154 |
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Ain't nothing new in sailing. Wasn't there a moth in the 70's where the helm could pull a lever at the wward mark and change the hull shape? |
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Medway Maniac ![]() Really should get out more ![]() ![]() Joined: 13 May 05 Location: United Kingdom Online Status: Offline Posts: 2788 |
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Rupert: yes my initial thought was lower vmg because the increased drag of the heeled hull and lost foil efficiency would slow the board down.
But as others have said, it seems plausible that the upward force generated by the foil might actually reduce the drag, especially as the total displacement of board plus sailor is pretty light. Some Moths used to have canting boards for the same reason. |
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Rupert ![]() Really should get out more ![]() Joined: 11 Aug 04 Location: Whitefriars sc Online Status: Offline Posts: 8956 |
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http://www.yachtsandyachting.com/class/Libera This kind of thing? |
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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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iGRF ![]() Really should get out more ![]() ![]() Joined: 07 Mar 11 Location: Hythe Online Status: Offline Posts: 6499 |
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Well the whole technique got sprung on us with the advent of the round board which tended to roll naturally, prior to that, the fast technique for the original windsurfer was to over sheet put a lot of pressure on the rear of the hull so the nose came into the wind and the plate acted as if it had been gybed so you were exerting as much pressure on the lee side of the foil as possible, that techniques is probably gone now long forgotten and the foils that come with boards like techno's and RSX wouldn't work anyway, much to flex. The railing/foiling techniques carried over into race boards and with it remember you also have the uplift and unweighting of the helm by the rig being canted over, the early you did this the free-er and faster you could move into what I call fast glide rather than planing, it's not planing but nor is it displacement because the board becomes lighter when you get the groove dialled. It's interesting to note it's carried over into foils as they can't to weather, I imagine the main down foil that attaches to the T acts like the windsurfing centreboard to counter anything lost from the lower T foil, either way it works you can see them hauled over to weather. Edited by iGRF - 10 Oct 14 at 2:16pm |
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Rupert ![]() Really should get out more ![]() Joined: 11 Aug 04 Location: Whitefriars sc Online Status: Offline Posts: 8956 |
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Funny, I was thinking about Swiss lake boats earlier on - some amazing creations which never have to put up with sea conditions. Mind, the lakes can get pretty rough, but you aren't going to get ocean swell!
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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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gordon ![]() Really should get out more ![]() Joined: 07 Sep 04 Online Status: Offline Posts: 1037 |
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Has anyone seen a modern Marblehead. If speed is calculated in boatlengths per second they are faster than the last AC 'boats'.
A 20 foot Marblehead with the keel replaced by a rugby team out on the wire... hold on - don't they already have boats like that on the Swiss lakes. |
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Gordon
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JimC ![]() Really should get out more ![]() ![]() Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6662 |
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That seems to make sense to me. Assuming one has enough foil to prevent excessive leeway, then converting the rest to lift ought to work, especially if wetted area reduces as well. And of course with the board the sail is decoupled from the hull, so the rig stays giving as much power as possible, not dumping air over the top as it would with a dinghy. |
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