Edition
Boats for sale
| Laser 28 - Excellent example of this great design Hamble le rice |
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| Rossiter Pintail Mortagne sur Gironde, near Bordeaux |
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| Laser 140101 Tynemouth |
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List classes of boat for sale |
V Twin |
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PaulB 
Groupie 
Joined: 15 Nov 10 Location: Sleaford Online Status: Offline Posts: 73 |
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 Topic: V TwinPosted: 24 Jan 11 at 6:49pm |
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Looks like a cross between a Topper, Vortex and a kids bath toy....That thing is ugly..
Do you really think it will work or are you just one big wind-up ?
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Phantom 949
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Jack Sparrow
Really should get out more 
Joined: 08 Feb 05 Location: United Kingdom Online Status: Offline Posts: 2965 |
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Posted: 24 Jan 11 at 6:55pm |
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before you press the build button have a look at these, I posted 5/6 years ago....
http://www.yachtsandyachting.com/photos/forum/JackSparrow/2005-09-19_112517_P9110369low.jpg http://www.yachtsandyachting.com/photos/forum/JackSparrow/2005-09-26_182905_DSC00993.jpg http://www.yachtsandyachting.com/photos/forum/JackSparrow/2005-09-26_182919_perspective1.jpg http://www.yachtsandyachting.com/photos/forum/JackSparrow/2005-09-26_182932_perspective2.jpg the first is a french guy who lives in Carnac, I'm sure I can dig out his details somewhere. the second is a boat designed by Phil @ philsfoils Not to your tunnel hull design but built for stability. I can assure you the French one went like a scolded cat. Possibly a little to fast in fact! I may show you that you may not have to be quite so radical in your hull shape to achieve what you want. Edit: Just a thought though.... has Doug Lord been moonlighting for you on the design front, as I do see some similarities creeping in with your design...  http://www.boatdesign.net/gallery/data/500/aeroskiff014.jpg Edited by Jack Sparrow - 24 Jan 11 at 7:02pm |
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G.R.F.
Really should get out more
Joined: 10 Aug 08 Location: United Kingdom Online Status: Offline Posts: 4028 |
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Posted: 24 Jan 11 at 7:09pm |
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Er Yes & Yes is the answer to the last point. As for beauty, that is and always has been in the eye of the beholder, I like the way it looks. To me it looks fast, & stable, which is what the doctor ordered. As for will it work, that's what we intend to find out. The computer predictions indicate it should, put enough sail up and lets face it even wooden packing cases go, the key is not wether it works, it is how well does it work. What issues are there, is the handling too heavy, is it slow onto the plane, does it 'track' badly in waves, the thing I am most worried about, is the turbulence that is going to occur at the head of the tunnel cut out. On flat water it'll be a dream, my worse ironical nightmare would be that in broken chop it fails to plane and grabs all the time, so on my home water it'll be a failure, like lots of other boats. But hey, in for a penny.
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alstorer
Really should get out more
Joined: 02 Aug 07 Location: Cambridge Online Status: Offline Posts: 2899 |
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Posted: 24 Jan 11 at 7:59pm |
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Whilst I'm really rather impressed with your commitment to this, I'm still utterly, utterly baffled why someone after a boat that'll sail well in high, short, chop has gone for a scow bow. I know the furballs seem to work just fine, but I can remember getting it wrong a few times as a kid in a Topper. Other than that, all the yank Scows ply their trade on billiard table lakes.
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Al |
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G.R.F.
Really should get out more
Joined: 10 Aug 08 Location: United Kingdom Online Status: Offline Posts: 4028 |
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Posted: 24 Jan 11 at 8:25pm |
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Toppers are very short, very short boats do have issues with waves.
This is nearly 5 mtrs long, my experience of boats having issues with our particular wave length is that anything under 14 ft (4.26m) has problems . It has two planing rockers middle then aft, once on the aft section the nose should stay clear. Then there's the issue that anything with a fine entry, is wave piercing and will tend to go down rather than bounce up, so the nose volume is the very deliberate bit, if it were not, I might as well just go with a Cat, as you observe, furballs don't go down the mine. (I didn't know that, but can understand why not). The second point, the chances are, to really wind this thing up, it's going to need to be heeled, not sailed flat, it's likely to work well on flat water sailed flat, but anything troublesome, then it's going to need to be heeled. We're fitting the mother of all hi aspect foils in order to assist that, so then you present just half the bow, look at it then, not quite such a big area, yet still backed by nose volume. The idea, on the one hand it'll be dead easy, but on the other, a bit more technical input might be required to get even more out of it, which might suit me just fine. On the other hand it might not of course and it all be an rfwot. (Had a bit of a panic attack today)
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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: 24 Jan 11 at 8:51pm |
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If designed to sail heeled (and I think this is a very good plan) then should you angle the planing surfaces so they are flat when heeled with the windward one just kissing the water? Also, can you come up with a way of keeping the rig upright when heeled?
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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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Boydgt
Newbie 
Joined: 08 Aug 10 Online Status: Offline Posts: 31 |
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Posted: 25 Jan 11 at 12:01am |
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maybe of some interest
Edited by Boydgt - 25 Jan 11 at 12:06am |
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Skiffman
Far too distracted from work 
Joined: 27 May 04 Location: United Kingdom Online Status: Offline Posts: 291 |
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Posted: 25 Jan 11 at 9:55am |
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does that triple stage rocker give better wakestyle pop
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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: 25 Jan 11 at 8:39pm |
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Like Rupert says:
Doesn't that catapult cat have a side to side raking rig? Ie sail it heeled with the mast upright? You can let off the leeward shroud whilst sailing and pull in the windward one. More string to play with! |
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Javelin 558
Contender 2574 |
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G.R.F.
Really should get out more
Joined: 10 Aug 08 Location: United Kingdom Online Status: Offline Posts: 4028 |
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Posted: 27 Jan 11 at 1:26pm |
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No not necessarily, if you want better 'wakestyle' pop you need one of the new Slingshot 'flex' wakeboards Three stages of rocker alters the nose attitude according to boat(board) speed, something your 49er could do with.
I had considered this, but it would need a serious amount of engineering and I'd figured I had enough going on trying to bring the rig back and forward and tbh thought moving the rig back would theoretically make more difference than canting it to windward.
Edited by G.R.F. - 27 Jan 11 at 1:27pm |
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