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DSS in dinghies |
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craiggo 
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Joined: 01 Apr 04 Location: United Kingdom Online Status: Offline Posts: 1810 |
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 Topic: DSS in dinghiesPosted: 27 Dec 14 at 5:11pm |
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I've clearly been sitting around for too long over the festive period. I have been following the Sydney-Hobart with interest and wondering how dinghies could incorporate DSS to really make them go. Now before all the discussions start I am aware of the argument that WOXI is not using DSS per say, but a horizontal foil to try and lift the bow in broad reaching conditions to prevent it from mining. However the argument for using a horizontal foil to increase righting moment does seem logical especially on long narrow hulls.
My thoughts were that the IC would be a good choice of weapon and if you could link the seat to the foil, such that when you tack/gybe the seat then the foil tacks/gybes to, then you could get away with a significantly shorter seat and therefore potentially quicker to manoeuvre as well as being less nosey downwind in waves. JimC, how about trying it on your chopped down Nethercott? Or AndyP on tin teardrop? |
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rglew
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Joined: 12 Nov 14 Location: Broxbourne Online Status: Offline Posts: 27 |
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Posted: 27 Dec 14 at 5:36pm |
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To get this straight, DSS is a horizontal foil that sticks out the leeward side of the hull generating lift?
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Laser 72317, Fireball 14278, EPS 287
http://www.notboats.com |
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craiggo
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Joined: 01 Apr 04 Location: United Kingdom Online Status: Offline Posts: 1810 |
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Posted: 27 Dec 14 at 5:53pm |
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Rglew, spot on.
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Presuming Ed
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Joined: 26 Feb 05 Location: United Kingdom Online Status: Offline Posts: 641 |
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Posted: 27 Dec 14 at 7:13pm |
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Wings for the crew probably much more effective - much lower drag. If you're going to stick horizontal foils on dinghies, might as well make the boat fly.
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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: 28 Dec 14 at 1:20pm |
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Could be of use to those of more limited mobility, though?
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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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JimC
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Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6662 |
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Posted: 28 Dec 14 at 4:13pm |
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Thing is, if you're going to use a foil to lift the boat then why would't you stick it on the end of the daggerboard where it will do most good with least surface interaction. Then you could heel the boat to windward so the whole lift of the foil is to leeward of the boat weight. Oh, and probably good to minimise the size of the hull for aero drag. And oh looky, what have we got? That seems to be the way with lifting foils in dinghies, almost every option, developed to a logical conclusion, seems to end up with the realisation that you might as well have a Moth anyway.
As far as the IC is concerned the rules limit the boat to one centreboard trunk, one rudder trunk and no other holes, and with some other stuff I think you'd really struggle to get a DSS foil within the rules. I'm not sure its a development to be encouraged since I think mark roundings could be very "interesting" with an underwater but near surface projecting blade... Edited by JimC - 28 Dec 14 at 4:20pm |
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Chris 249
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Joined: 10 May 04 Online Status: Offline Posts: 2041 |
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Posted: 01 Jan 15 at 10:38pm |
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While DSS is interesting, isn't one of the timex when you really need stability when things have already gone cactus and you're heeled heavily and slow? At such times, is DSS really going to help much?
I wonder if DSS is not a bit like ultra-wide wings, in that both may add power and speed in 'steady state' conditions but may allow one to reduce inherent stability or add rig and therefore lead to bigger crashes at times. Of course that's all fine and good in its own way! Given the amount of stuff there is out there in the ocean to hit in the Hobart (I've driven a boat that was leading its class into a sunfish and out of the race
 ; the damn things are almost impossible to see) I'd hope that DSS boxes were either enormously strong or that the foils had a designed-in weak point. Similar issues could apply when dinghy racing.Edited by Chris 249 - 01 Jan 15 at 10:42pm |
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Presuming Ed
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Joined: 26 Feb 05 Location: United Kingdom Online Status: Offline Posts: 641 |
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Posted: 02 Jan 15 at 3:03pm |
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Stick one on a Skud. Could be interesting?
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craiggo
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Joined: 01 Apr 04 Location: United Kingdom Online Status: Offline Posts: 1810 |
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Posted: 02 Jan 15 at 9:09pm |
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Thats not a bad shout. |
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