Laser 140101 Tynemouth |
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Laser 28 - Excellent example of this great design Hamble le rice |
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Laser 161752 Tynemouth |
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List classes of boat for sale |
Mast Head T Foil? |
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Rupert ![]() Really should get out more ![]() Joined: 11 Aug 04 Location: Whitefriars sc Online Status: Offline Posts: 8956 |
![]() ![]() ![]() ![]() Posted: 30 Oct 14 at 10:42am |
That 2nd one has it filled with lighter than air gas, too, which I suspect sums up the whole project.
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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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hobbiteater ![]() Posting king ![]() Joined: 07 Dec 12 Location: United Kingdom Online Status: Offline Posts: 107 |
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most gliders are span limited, by class (15m, 18m, 20m) or by structural considerations (a 0.3m winglet gives an equivalent span increase of 1m so is much lighter). there are also handling benefits not applicable to sails. they dont fly inverted (which sails do - port or stbd tack)
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Medway Maniac ![]() Really should get out more ![]() ![]() Joined: 13 May 05 Location: United Kingdom Online Status: Offline Posts: 2788 |
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We're span-limited too - most class rules limit the mast length.
I like the idea of a 0.3m winglet (or pair thereof) instead of a 1m longer mast which would add about a kilo of mast higher up (alu. rig). Lower c.of.e. too. |
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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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We have to be symmetrical though, so need an identical structure each side which increases the weight and hugely complicates the aerodynamics compared to the glider.
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Medway Maniac ![]() Really should get out more ![]() ![]() Joined: 13 May 05 Location: United Kingdom Online Status: Offline Posts: 2788 |
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Airbus winglet. Not quite symmetrical, but shows that pressure side fences are not without benefits:
http://commons.wikimedia.org/wiki/File:Winglet_Airbus_A319-132.jpg |
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getafix ![]() Really should get out more ![]() ![]() Joined: 28 Mar 06 Location: United Kingdom Online Status: Offline Posts: 2143 |
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Interesting stuff, would a winglet at the mast head that could be spun around be the answer? this as an effort to overcome the symetrical 'issue' which would result in a t-foil type structure, I'm thinking more "L" than "T", just t'other way up with a kind of mast-spanner or wheel effort (with pulley arrangement) at the mast base to provide the spin. Even better, a system allowing the <wing> mast's rotation to govern the winglets' angle via an off-set pulley system connected to 'arms' off the base of the mast
Edited by getafix - 30 Oct 14 at 6:41pm |
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Medway Maniac ![]() Really should get out more ![]() ![]() Joined: 13 May 05 Location: United Kingdom Online Status: Offline Posts: 2788 |
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Winglets seem to work best near the trailing edge where the vortex is building to its maximum energy, so the foil would really need to be near the leech of a square top sail for best effect - tricky to arrange.
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mole ![]() Groupie ![]() Joined: 02 Feb 06 Location: United Kingdom Online Status: Offline Posts: 43 |
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These model yacht guys have been doing it for some time.
http://www.users.on.net/~malcolmandjane/750/750picsJ.html Edited by MerlinMags - 03 Nov 14 at 7:48am |
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hobbiteater ![]() Posting king ![]() Joined: 07 Dec 12 Location: United Kingdom Online Status: Offline Posts: 107 |
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unfortunately not even close to being aerodynamically symmetrical even if it looks similar geometrically.
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fab100 ![]() Really should get out more ![]() ![]() Joined: 15 Mar 11 Online Status: Offline Posts: 1005 |
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Will the winglet need a winglet?
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