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mike ellis View Drop Down
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Posts: 2339 		Post Options Post Options   Quote mike ellis Quote  Post ReplyReply Direct Link To This Post Topic: Daggerboard repair
    Posted: 02 May 07 at 7:23pm
thanks jack, that helped. it satisfied my curiosity
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Jack Sparrow View Drop Down
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Posts: 2965 		Post Options Post Options   Quote Jack Sparrow Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 07 at 7:07pm
Found this about Dennis Conner's - Stars & Stripes AC boat and the use of riblets if your interested -

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Jack Sparrow View Drop Down
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Posts: 2965 		Post Options Post Options   Quote Jack Sparrow Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 07 at 6:55pm
I would imagine the america's cuppers are using a riblet surface which would give a impression of a matt surface ( NASA invention ) most commonly seen on Sharks and Olympic Austrailan Swimmers with big feet.

http://www.aerodyn.org/Drag/riblets.html

Roughing the hull is essentially a poor mans version and you need to keep the scratches in line with the flow.
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Jack Sparrow View Drop Down
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Posts: 2965 		Post Options Post Options   Quote Jack Sparrow Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 07 at 6:31pm
laminar flow. The skin friction is reduced by attaching a layer of water ( microns ) close to hull on which the rest of the water flows over.
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mike ellis View Drop Down
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Posts: 2339 		Post Options Post Options   Quote mike ellis Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 07 at 5:25pm
so that would not work on a dinghy, far too slow.
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BBSCFaithfull View Drop Down
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Posts: 1251 		Post Options Post Options   Quote BBSCFaithfull Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 07 at 10:07pm
Umm cos the rough surface created a layer of airbubbles under the back of the boat or something

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mike ellis View Drop Down
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Posts: 2339 		Post Options Post Options   Quote mike ellis Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 07 at 6:46pm
do you know why redback?
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redback View Drop Down
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Posts: 1502 		Post Options Post Options   Quote redback Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 07 at 12:02am
I know it doesn't apply to sailing boats but power boats entering speed events alway rough up the hull just aft of the bow.
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Posts: 228 		Post Options Post Options   Quote allanorton Quote  Post ReplyReply Direct Link To This Post Posted: 29 Apr 07 at 8:22am

Originally posted by JimC

Originally posted by redback

its supposed to be faster than polished.


Not by anyone who's actually done testing.

I've always thought that a shiny, high plished finish is best, but recent pics. of americas cup boat keels seem to show a matt finish?
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JimC View Drop Down
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Posts: 6660 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 29 Apr 07 at 1:14am
Originally posted by redback

its supposed to be faster than polished.


Not by anyone who's actually done testing.
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