| Laser 28 - Excellent example of this great design Hamble le rice |
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| Laser 140101 Tynemouth |
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| Rossiter Pintail Mortagne sur Gironde, near Bordeaux |
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aardvark_issues 
Really should get out more 
Joined: 24 Jul 05 Location: Weston-Super-Mare Online Status: Offline Posts: 505 |
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 Topic: Favourite PhotosPosted: 19 Nov 06 at 2:14pm |
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And it's impossible to really drive those things. They have pretty tall rigs for
the length of hull and the bows go down mighty easy. I've got a picture somewhere of my dads old Formula 40 with the transoms going up and a lot of sag in the leeward shroud... Will try and find it. |
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aardvark_issues
Really should get out more
Joined: 24 Jul 05 Location: Weston-Super-Mare Online Status: Offline Posts: 505 |
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Posted: 19 Nov 06 at 2:56pm |
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Found it, memories of a misspent childhood watching these things...
Sorry for the quality, taken in the mid 80's! 
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boatshed
Far too distracted from work 
Joined: 12 Apr 05 Online Status: Offline Posts: 457 |
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Posted: 19 Nov 06 at 2:58pm |
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[QUOTE=aardvark_issues]And it's impossible to really drive those things. They have pretty tall rigs for the length of hull and the bows go down mighty easy. QUOTE] You're in trouble now. When, way back in this thread, I suggested high performance cats have this vice when driven hard downwind, Tornado-Alive went apoplectic and went on to post every photo he could find of monos going down the mine. Standby. |
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Steve
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aardvark_issues
Really should get out more
Joined: 24 Jul 05 Location: Weston-Super-Mare Online Status: Offline Posts: 505 |
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Posted: 19 Nov 06 at 8:05pm |
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Well, they cant help they are designed that way!
A catamaran barely gets any lift from the hull and normal speed and doesnt get much more at higherspeeds. Once the windward hull is flying the drag is only going to go up. Planing dinghies have the opposite problem, you have to stop them coming back down and stacking it! Windsurfers are fast because the would be show stopper of hull drag is practically non-existant as it's flying for the most part... Add suitable sized rig for conditions (something most dinghy sailors dont want the hassle of, theyre expensive enough as they are) and you have a pocket rocket. |
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CT249
Far too distracted from work
Joined: 08 Jul 06 Online Status: Offline Posts: 399 |
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Posted: 19 Nov 06 at 10:12pm |
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Yeah, but the thing I find interesting is the pace of a longboard upwind, when it doesn't have the advantage of getting rid of a lot of wetted surface. An IMCO wastes an International Canoe in 12-15 knots or more, upwind. The rig is only lifting a small amount in such conditions, I think, so there's something else happening. And it only has one rig, really (no adult used the 6.6 AFAIK).
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Tornado_ALIVE
Really should get out more
Joined: 07 Nov 04 Location: Australia Online Status: Offline Posts: 611 |
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Posted: 20 Nov 06 at 9:33am |
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I've raced in mix fleets with skiffs and cats many times. The Skiffs spent more time cartwheeling and swimming that any of the cats on the same course...... Nuff said. Secondly, with the exception of sail boards (which are the qiuikest bar non straight line)..... What type of boat holds EVERY current speed record. Could not be Multies, because they create too much drag at high speed.
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Hector
Really should get out more
Joined: 10 May 04 Location: Otley, Yorkshire Online Status: Offline Posts: 750 |
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Posted: 21 Nov 06 at 2:50pm |
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'Railing' the board inclines the Daggerboard and causes verticle lift (bit like a hydrofoil), the skeg acts like wise. Add to that the lack of leeward drift because the rails resist it and you have speed AND pointing / CMG - a devasting combination. Edited by Hector |
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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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Posted: 21 Nov 06 at 7:05pm |
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So tell me again why you sail a Tornado [grin]
Interestingly though I'm not sure a catamaran has ever held the 500m outright speed record. Always been proas and other asymettric hull boats before the boards. But I agree, if, like the snail, you have to take your house with you to travel a very long way, then the Catamaran or Trimaran does seem to be the best platform. Edited by JimC |
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Tornado_ALIVE
Really should get out more
Joined: 07 Nov 04 Location: Australia Online Status: Offline Posts: 611 |
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Posted: 21 Nov 06 at 9:38pm |
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Sorry Jim, don't sail the T any more. Sold it to get into the F18 fleet for the up coming Worlds. Think I may just keep the F18 as it may not be the refined powerhouse the T is, but the racing in Oz is a lot more competitive and for half the price. Cats at one stage did hold the record before the windsurfers and Yellow Pages Endeavour. One of them was the Hydrofoil Tornado Icarus. Enough of the boat bashing, obvious multi sailors like myself come here to share knowledge and pics and then some insecure sailor comes along and feels the only way they can justify their ride and in an attempt to gain a little respect is to bash the multies. I can play at that game as well but I do have a healthy respect for monos as well. (I do sail them as well)........ So just get out and enjoy your sailing. |
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CT249
Far too distracted from work
Joined: 08 Jul 06 Online Status: Offline Posts: 399 |
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Posted: 21 Nov 06 at 9:55pm |
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Yeah, there's a bit of that.....but like a lot of other things (inclined rig, sliding the mast aft etc) which have been seen as the key, the boards still sail fast even when you don't do it. Railing is faster like you say, but when you don't rail, the board doesn't slow that much; not enough to bring it down to the performance of a dinghy, anyway. In very heavy stuff I regularly drop the rail down just before the big gusts, to avoid a capsize fall, and the VMG loss is very small. Secondly, I think theoretically the rails should be operating at a different angle of attack, and they are an incredibly low aspect lifting surface anyway so may not be very efficient. So yep, as far as I can see there's something in that but personally I think there's something else. Similarly, on an even heel downwind the boards are very quick, as we know. |
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