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Mast Head T Foil?

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iiitick View Drop Down
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    Posted: 29 Oct 14 at 6:12pm
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 View Drop Down
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Post Options Post Options   Quote I luv Wight Quote  Post ReplyReply Direct Link To This Post Posted: 29 Oct 14 at 6:09pm
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 View Drop Down
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Post Options Post Options   Quote iiitick Quote  Post ReplyReply Direct Link To This Post Posted: 29 Oct 14 at 6:08pm
Originally posted by Medway Maniac

What are you on today, tick?  Can you sue Grumph for messing with your head?

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 View Drop Down
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Post Options Post Options   Quote Medway Maniac Quote  Post ReplyReply Direct Link To This Post Posted: 29 Oct 14 at 5:35pm
What are you on today, tick?  Can you sue Grumph for messing with your head?
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iiitick View Drop Down
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Post Options Post Options   Quote iiitick Quote  Post ReplyReply Direct Link To This Post Posted: 29 Oct 14 at 5:17pm
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 View Drop Down
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Post Options Post Options   Quote Medway Maniac Quote  Post ReplyReply Direct Link To This Post Posted: 29 Oct 14 at 1:24pm
Originally posted by Jack Sparrow

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.

Sorry, I thought that was what people had in mind.  I can't see the masthead idea working at all.  Then again:

Originally posted by Rupert

It could well work better than a float bouncing around at the top of the mast

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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Post Options Post Options   Quote Jack Sparrow Quote  Post ReplyReply Direct Link To This Post Posted: 29 Oct 14 at 1:12pm
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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Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 29 Oct 14 at 12:59pm
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.
Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 29 Oct 14 at 12:40pm
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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Post Options Post Options   Quote maxibuddah Quote  Post ReplyReply Direct Link To This Post Posted: 29 Oct 14 at 12:37pm
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
Everything I say is my opinion, honest
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