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sandgrounder View Drop Down
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Posts: 220 		Post Options Post Options   Quote sandgrounder Quote  Post ReplyReply Direct Link To This Post Topic: Dinghy hull coatings
    Posted: 12 Dec 13 at 5:47pm
Originally posted by Mike Holt

Over the years I have tried every type of hull finish, sanding, T-cut and polish. Now I clean thoroughly, repair any damage and scratches and then polish with a teflon wax. My feeling is that this will keep grease and dirt off the best of any option and it is very hard to keep a boat clean, particularly in venues where there may be less than crystal clear water. That dirt on the boat will have at least as negative effect as anything else.

Boat also looks better that way!
 
I never could bring myself to apply a polymer (teflon) at an event, in case it brought me in to conflict with an over-zealous jury and the application of RRS 53.
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Mike Holt View Drop Down
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Posts: 58 		Post Options Post Options   Quote Mike Holt Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 13 at 3:20pm
Over the years I have tried every type of hull finish, sanding, T-cut and polish. Now I clean thoroughly, repair any damage and scratches and then polish with a teflon wax. My feeling is that this will keep grease and dirt off the best of any option and it is very hard to keep a boat clean, particularly in venues where there may be less than crystal clear water. That dirt on the boat will have at least as negative effect as anything else.

Boat also looks better that way!
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Reuben T View Drop Down
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Posts: 74 		Post Options Post Options   Quote Reuben T Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 13 at 1:35pm
I have heard that sanding to around 600 grit is the most efficient finish as it creates a boundary layer of water moving with the boat, so it effectively lubricates the hull with water. I was told this by a friend of Phil Morrison who said this was a theory that Phil believed in, therefore I am inclined to believe it.
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Rupert View Drop Down
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Posts: 8956 		Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 13 at 12:36pm
Highly polished centreboards are always fun to watch after a capsize!
Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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sandgrounder View Drop Down
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Posts: 220 		Post Options Post Options   Quote sandgrounder Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 13 at 10:25am
I never cease to be amazed by the constant focus on hull finish, whilst ignoring foil finish, where the bigger gains are to be made.
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Dougal View Drop Down
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Posts: 556 		Post Options Post Options   Quote Dougal Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 13 at 10:24am
Originally posted by JimC

I understood the riblets had to be precisely aligned with the local waterflow, and were only really useful within a limited speed range. Its no good kidding yourself that leaving the hull rough will have the same effect...

Yes - there was a large amount of precision involved.  It may even have been in a Y&Y article, but I recall the riblets were applied by way of a laminate stuck onto the hull, with the grooves/ridges being in a wavy pattern and being lined up precisely with the contours of the hull.

Anyone know if the technology is still being used in boats?  If it worked it would seem a prime candidate for the foils on the AC72's.
What could possibly go wrong?
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JimC View Drop Down
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Posts: 6662 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 13 at 10:12am
I understood the riblets had to be precisely aligned with the local waterflow, and were only really useful within a limited speed range. Its no good kidding yourself that leaving the hull rough will have the same effect...
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Dougal View Drop Down
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Posts: 556 		Post Options Post Options   Quote Dougal Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 13 at 9:42am
Originally posted by Presuming Ed

Originally posted by Dougal

I remember the Americas cup boats years back, possibly still in the days of 12m, using a grooved pattern on the hull to create some stickiness to encourage laminar flow.  Apologise for the lack of technical explanation, if I can find anything tomorrow when sober I will post it.

Riblets. 87 by Stars & Stripes. Also, IIRC, used by Oxford in the 87 boat race (the year of the mutiny). 



Thank you - that's exactly what I was talking about.
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Presuming Ed View Drop Down
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Posts: 641 		Post Options Post Options   Quote Presuming Ed Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 13 at 7:30am
Originally posted by Dougal

I remember the Americas cup boats years back, possibly still in the days of 12m, using a grooved pattern on the hull to create some stickiness to encourage laminar flow.  Apologise for the lack of technical explanation, if I can find anything tomorrow when sober I will post it.

Riblets. 87 by Stars & Stripes. Also, IIRC, used by Oxford in the 87 boat race (the year of the mutiny). 




Edited by Presuming Ed - 12 Dec 13 at 7:32am
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Aching Knees View Drop Down
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Posts: 11 		Post Options Post Options   Quote Aching Knees Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 13 at 6:47am
Bring back graphspeed, the black graphite paint or international smooothie, the pink stuff
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