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Boats for sale
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Mast Head T Foil? |
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iiitick 
Far too distracted from work 
Joined: 04 Jun 14 Location: gb Online Status: Offline Posts: 478 |
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 Topic: Mast Head T Foil?Posted: 29 Oct 14 at 6:12pm |
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So the search is on for lower drag rigs....how did the wing sail go in the end?
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I luv Wight
Really should get out more 
Joined: 28 Jan 05 Location: United Kingdom Online Status: Offline Posts: 628 |
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Posted: 29 Oct 14 at 6:09pm |
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I was thinking of doing this on the moth a few years ago - with a triangular ply board to make an end plate, the sail square head being about the right angle.
OK a longer mast does the same thing, but class rules limit the length of the mast and luff length. There is ( or was ) an allowance of 10% of the sail area that isn't measured if it's at 90 degrees to the mast, so it could have worked as an addon - free area :-). But moths now need lower drag , not more power. |
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iiitick
Far too distracted from work
Joined: 04 Jun 14 Location: gb Online Status: Offline Posts: 478 |
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Posted: 29 Oct 14 at 6:08pm |
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Ah, now. Just recovering back home from a very pleasant lunch in nice Peak District hotel, relaxing and thinking up 'bright' ideas.
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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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Posted: 29 Oct 14 at 5:35pm |
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What are you on today, tick? Can you sue Grumph for messing with your head?
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iiitick
Far too distracted from work
Joined: 04 Jun 14 Location: gb Online Status: Offline Posts: 478 |
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Posted: 29 Oct 14 at 5:17pm |
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Actually it would be quite easy to set up a test rig and look into this. Broom pole, bed sheet, cardboard, hairdryer and Havana Cigar.
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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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Posted: 29 Oct 14 at 1:24pm |
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Sorry, I thought that was what people had in mind. I can't see the masthead idea working at all. Then again:
I am often amazed how little effect the huge bags our local 2k's use have on upwind performance. I'd have expected them to be real speed-killers, but i've seen bag-men beat equally competent non-bag men on many occasions.
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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: 29 Oct 14 at 1:12pm |
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If you are going to do anything like that. Don't put winglets on the mast, put a fence on the sail head (would only really work on a square head). Although this will be illegal in just about all class rules.
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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: 29 Oct 14 at 12:59pm |
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It could well work better than a float bouncing around at the top of the mast, a pad in the top of the sail or a flying saucer thing up there.
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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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iGRF
Really should get out more
Joined: 07 Mar 11 Location: Hythe Online Status: Offline Posts: 6499 |
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Posted: 29 Oct 14 at 12:40pm |
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Increasing the mast height as well as adding weight it adds leverage and heeling moment, so if the mast height could be reduced, or if a boat already has a given mast size, but the addition of a light foil up top which could tidy up the vortices up there and probably add area for downwind running and reaching due to the resulting upward swing as the boat heels, I'd like to see empirical evidence of it having been tried before writing it off.
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maxibuddah
Really should get out more
Joined: 06 Mar 09 Location: United Kingdom Online Status: Offline Posts: 1760 |
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Posted: 29 Oct 14 at 12:37pm |
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By stopping the airflow from falling off of the end of the wing because of the fin it increases the amount of lift for a given wing size. That enables the carriers to carry less fuel, saving money
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Everything I say is my opinion, honest
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