| Rossiter Pintail Mortagne sur Gironde, near Bordeaux |
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| Laser 28 - Excellent example of this great design Hamble le rice |
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| Laser 140101 Tynemouth |
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List classes of boat for sale |
Spy photos |
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Jack Sparrow 
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Joined: 08 Feb 05 Location: United Kingdom Online Status: Offline Posts: 2965 |
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 Topic: Spy photosPosted: 06 Dec 07 at 3:55pm |
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Funky foils!
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Smight at BBSC
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Joined: 09 Jan 07 Location: Great Britain Online Status: Offline Posts: 1129 |
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Posted: 06 Dec 07 at 8:48pm |
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How well does it work? Or are they untested as of yet? |
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RS600 988
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tmoore
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Joined: 01 Nov 07 Location: Wales Online Status: Offline Posts: 880 |
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Posted: 06 Dec 07 at 11:08pm |
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why is it only on the rudder and not the daggerboard aswell??
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Landlocked in Africa
RS300 - 410 Firefly F517 - Nutshell Micro Magic RC yacht - Eclipse |
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Black no sugar
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Joined: 04 Dec 04 Location: Somewhere between Brighton and Lancing Online Status: Offline Posts: 3941 |
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Posted: 06 Dec 07 at 11:23pm |
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Snowboarding with a twist!
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tack'ho
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Joined: 08 Feb 06 Location: United Kingdom Online Status: Offline Posts: 1100 |
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Posted: 07 Dec 07 at 4:56pm |
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I would guess and correct me if i'm wrong, but the end effect (that of water moving from below to above the foil via the tip) would be more significant on a foil which can rotate perpendicular to it's plane of action than on a fixed foil. ps. I'm yet to be convinced there won't be any detrimental drag effects on a rotating foil tho. Edited by tack'ho |
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I might be sailing it, but it's still sh**e!
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redback
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Joined: 16 Mar 04 Location: Tunbridge Wells Online Status: Offline Posts: 1502 |
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Posted: 07 Dec 07 at 10:20pm |
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Surely the foil on the daggerboard has got a trim tab so it can't so easily accomodate the curly ends?
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aardvark_issues
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Joined: 24 Jul 05 Location: Weston-Super-Mare Online Status: Offline Posts: 505 |
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Posted: 08 Dec 07 at 10:55am |
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Redback wins...
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tack'ho
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Joined: 08 Feb 06 Location: United Kingdom Online Status: Offline Posts: 1100 |
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Posted: 08 Dec 07 at 11:24am |
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come on then Aardvark talk us through the physics of them!
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I might be sailing it, but it's still sh**e!
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andy_cherub
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Joined: 16 Mar 05 Location: United Kingdom Online Status: Offline Posts: 768 |
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Posted: 03 Jan 08 at 1:01pm |
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Its to reduce wing tip vorticies - the water commig from the end of the foil down to the "middle" and gnarling up the entire flow of water - thus drag. Dont know why its not on the daggerboard - and surely oval section tip would be just as this as its relativly low speeds (compared to a plane wing or speed boat hydrofoils). Sames been tried on the big Tris at the top of their square top sails, as the fat head square top sails arent actually very efficient! Still working out and developing - isnt technology great................................ |
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-12ft skiff, Team 'CST Composites'
-Many thanks goes out to all of my sponsors. Ignore my user name, my views are of a 12ft skiff |
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Isis
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Joined: 01 Sep 05 Online Status: Offline Posts: 2753 |
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Posted: 03 Jan 08 at 3:36pm |
Mikes winglets should reduce lift-induced drag a little but they are generaly used to take advantage of the flow produced by the wing tip vortices and produce a little extra forward thrust. Edited by Isis |
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