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Solid 'Wing' sails? |
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Sam.Spoons 
Really should get out more 
Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3401 |
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 Topic: Solid 'Wing' sails?Posted: 12 Jun 17 at 7:44pm |
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I had guessed that, my Spice kite wouldn't be much use on a cat then ;)
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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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: 12 Jun 17 at 1:57pm |
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They tend to be quite flat cut.
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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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Sam.Spoons
Really should get out more
Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3401 |
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Posted: 12 Jun 17 at 1:05pm |
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Good point but it can't happen most of the time or cats wouldn't bother with assy kites at all?
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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ttc546
Posting king 
Joined: 15 Apr 05 Online Status: Offline Posts: 155 |
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Posted: 12 Jun 17 at 11:33am |
Maybe, maybe not. Speed moves the apparent wind, so kites can become useless downwind.
Edited by ttc546 - 12 Jun 17 at 11:34am |
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Sam.Spoons
Really should get out more
Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3401 |
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Posted: 12 Jun 17 at 9:45am |
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My gut feeling (which may be completely wrong
 ) is that a wing is going to be more efficient upwind than a conventional sail but probably not so off wind. A big asymmetric kite would solve that. Those long cat hulls don't really have a displacement mode and a planing mode like a mono. I'd be interested to know how much difference WL really makes on a fast cat.
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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Chris 249
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Joined: 10 May 04 Online Status: Offline Posts: 2041 |
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Posted: 12 Jun 17 at 8:08am |
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Sure, but the fact remains that downwind the C Class' rig is comparatively small, which must have a very significant effect on rig design.
Even upwind it's not a huge rig compared to some fast 20 footers. The Supercat 20 carries 25.5m2 of sail upwind; Eagle 20 25; Hobie 20 23.2; Nacra 20 24.15, Nacra 20C 26. The Marstrom 32 has 53.6m, the Marstrom M20 22 and A Class 14. The C Class is halfway between the A and M32 in length, but the sail area is well under halfway between the two. Many years ago I watched the top C Class Victoria 150 race the unlimited 18 Foot Skiffs. The C Class won overall quite easily but was slower down the squares than the 18s despite being soooo much longer.
Edited by Chris 249 - 12 Jun 17 at 8:12am |
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sailcraftblog.wordpress.com
The history and design of the racing dinghy. |
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Sam.Spoons
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Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3401 |
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Posted: 10 Jun 17 at 9:49am |
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That's only true if you include the kite (which the C Class doesn't have). The C Class has 27.9 m2 upwind and the F16 has 18.7 m2.
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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Chris 249
Really should get out more
Joined: 10 May 04 Online Status: Offline Posts: 2041 |
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Posted: 09 Jun 17 at 11:07pm |
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sailcraftblog.wordpress.com
The history and design of the racing dinghy. |
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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: 09 Jun 17 at 8:48pm |
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Was that really 7 years ago?
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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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I luv Wight
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Joined: 28 Jan 05 Location: United Kingdom Online Status: Offline Posts: 628 |
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Posted: 09 Jun 17 at 7:08pm |
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http://realisedesign.co.uk/wp-content/uploads/2010/09/ben_dsc0368.jpg
Another moth pic Edited by I luv Wight - 09 Jun 17 at 7:09pm |
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