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Not exactly a dinghy but... |
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Stefan Lloyd 
Really should get out more 
Joined: 03 Aug 04 Online Status: Offline Posts: 1599 |
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 Topic: Not exactly a dinghy but...Posted: 20 Nov 06 at 9:07am |
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Gliders get the energy to move forwards by sinking through the air (although the pilots also look for air that is rising, so the glider may rise relative to the ground even though it is sinking through the air). This design can't get energy in that way, or it would sink. Therefore it is not a glider. |
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Stefan Lloyd
Really should get out more
Joined: 03 Aug 04 Online Status: Offline Posts: 1599 |
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Posted: 20 Nov 06 at 8:52am |
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"I may have misunderstood the theory but I thought foils start to cavitate and so restrict speeds to around thirty knots" So how do you think sailboards manage almost 50 knots? |
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NickA
Really should get out more
Joined: 30 Mar 05 Location: United Kingdom Online Status: Offline Posts: 784 |
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Posted: 19 Nov 06 at 5:16pm |
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I reckon it's genuine sailing because it needs the water to be there in order to work (unlike the fighter jet analogy). It's not so different from a windsurfer really. As the configuration doesn't cause the "boat" to heel they can use as big a sail as they want so there needn't be any lack of drive force to achieve that 20knt lift off speed. Trouble is, wind isn't steady so surely the hull will bounce up and down (as the model's does in the video) and the thing will have to be incredibly strong to withstand the battering. Anyway, good luck to them. Crazy contraptions are great. Wonderful when the work and even more fun when the self destruct at speed. |
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Javelin 558
Contender 2574 |
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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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Posted: 17 Nov 06 at 8:53am |
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It seems to me they are going for the "one toe in the water and calling it swimming" approach to speed here. I'm sure a jet fighter could break the land speed record by flying low over a mile of salt flat trailing a wheel on a long rod along the ground, but that wouldn't be driving. Is this really sailing, or is it a water take off glider? Personally, and based on no scientific knowledge at all, I think they are going to have a nasty shock when they actually try and use the thing, and discover just how difficult it is to get to the 20 knots they need for the whole thing to actually achieve lift off, and how unstable it will all get if they ever manage that.
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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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rogerd
Really should get out more
Joined: 25 May 04 Online Status: Offline Posts: 1076 |
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Posted: 17 Nov 06 at 8:43am |
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Charlie
Far too distracted from work 
Joined: 08 May 06 Location: United Kingdom Online Status: Offline Posts: 209 |
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Posted: 16 Nov 06 at 8:32pm |
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Same place as for crash test dummies  |
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Finn GBR 657 - Blown It
Laser 164635 Planet Earth: 30% Land, 70% race course! |
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mike ellis
Really should get out more
Joined: 30 Dec 05 Location: United Kingdom Online Status: Offline Posts: 2339 |
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Posted: 16 Nov 06 at 7:24pm |
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what he said |
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600 732, will call it Sticks and Stones when i get round to it.
Also International 14, 1318 |
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Quagers
Far too distracted from work
Joined: 24 Oct 06 Location: United Kingdom Online Status: Offline Posts: 279 |
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Posted: 16 Nov 06 at 5:55pm |
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looks like their gonna try to break every sailing speed record in the book.
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MainlySwimming
Groupie 
Joined: 28 Nov 05 Online Status: Offline Posts: 65 |
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Posted: 15 Nov 06 at 6:36pm |
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...not exactly a keelboat either, so apologies for posting here but thought anyone who hadn't seen it may be interested.. It's on the front page of sailinganarchy today and an interesting browse: http://www.monofoil.com/boat/index.php
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