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Mast Head T Foil? |
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MattHarris 
Groupie 
Joined: 03 Oct 06 Location: United Kingdom Online Status: Offline Posts: 94 |
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 Topic: Mast Head T Foil?Posted: 29 Oct 14 at 12:14pm |
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I thought it was used on aircraft as they are restricted by space in airports where the wings can only have a maximum width.
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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 12:11pm |
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Well, aircraft use winglets to recover some energy from the tip vortex instead of just adding span, and they are less concerned about the bending moment at the wing root than we are about the heeling moment, so I'm surprised that the great and good have ruled it out on sails.
I'd be interested to read their reasoning. Do you have any useful links, Chris?
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Chris 249
Really should get out more
Joined: 10 May 04 Online Status: Offline Posts: 2041 |
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Posted: 29 Oct 14 at 11:17am |
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It doesn't work; aerodynamics 101. You are better off using the same weight, area and complication to increase the mast height.
This has been pointed out repeatedly since the 1980s by big boat designers. It's also been repeatedly pointed out on Boat Design Forum by MIT aero professor Mark Drela (designer of world champion human powered boats and aircraft and AC winning multis) and Tom Speer (Boeing and Oracle AC designer).
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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 10:13am |
It was a long time ago when you and I were much younger....and Holman minor was still in short trousers.
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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 10:07am |
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Oh no did we already?
Nurse! I need some more of those memory tablets.. |
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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 9:54am |
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I thought we discussed this topic a while back?
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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 9:49am |
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So, I alluded to it in banter over on the kicker attachment thread, but it's been an idea I've been toying with, initially as a cure for turning turtle but with the secondary consideration of a power boost by converting tip turbulence to power generating flow at the head of the sail. Obviously it would only function with fathead sails, but what do the hive mind think?
Could such a thing be beneficial to the point main sail size reduction might even be possible? How such a thing could be constructed, I'd suggest kite technology from kite surfing, so a bow leading edge secured with a central batten down the middle of the foil so it is two sided the central batten attaching to the top or top batten of the sail. The result would be a wing tip foil closing the head. With the spin off of course of a mast head float. Thoughts? Edited by iGRF - 29 Oct 14 at 9:50am |
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