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Dinghy hull coatings

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iitick View Drop Down
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    Posted: 12 Dec 13 at 8:30pm
Originally posted by sandgrounder

53 SKIN FRICTION

A boat shall not eject or release a substance, such as a polymer, or have specially textured surfaces that could improve the character of the flow of water inside the boundary layer.

Really does it say that? Does my bad paint increase flow? Very hard to enforce that rule.

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Rupert View Drop Down
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Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 13 at 9:07pm
I think it has to be specially textured for the job, rather than just be put on with a trowel in the absence of a paintbrush!

Now, depending upon what you drink, weeing down the centreboard case could be seen as releasing a substance to improve laminer flow.
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iitick View Drop Down
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Post Options Post Options   Quote iitick Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 13 at 10:10pm
Still very difficult to prove what is a finish to improve performance or a finish to improve appearance.
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Post Options Post Options   Quote sandgrounder Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 13 at 10:34pm
Originally posted by Rupert

I think it has to be specially textured for the job, rather than just be put on with a trowel in the absence of a paintbrush!

Now, depending upon what you drink, weeing down the centreboard case could be seen as releasing a substance to improve laminer flow.
 
Haha, certainly a difficult rule to enforce / police.
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Post Options Post Options   Quote sargesail Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 13 at 11:34pm
Originally posted by iitick

Originally posted by sandgrounder

53 SKIN FRICTION

A boat shall not eject or release a substance, such as a polymer, or have specially textured surfaces that could improve the character of the flow of water inside the boundary layer.

Really does it say that? Does my bad paint increase flow? Very hard to enforce that rule.


More to the point it is spefically not aimed at Teflon type polishes.
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JimC View Drop Down
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 13 Dec 13 at 12:38am
Knickers severely in a twist here over nothing people.

The rule prohibits two separate treatments.

As I said before, if my memory serves me right RRS 53 was originally written to prohibit a polymer based material that you gunged on before the day's sailing, and which slowly dissolved/melted/something or another into the water over the day. I'm certain any kind of normal wax or teflon polish is just fine.

The textured surface bit was added later to ban the riblets stuff Dougal mentioned on page 1. It would be easy enough to spot and distinguish from a 60 grit sandpaper finish because it has to be specially aligned with water flow etc.

These are both expensive complicated and time consuming treatments, and in the case of the gunge polluting as well. Its a good thing that they are banned, but the rule has absolutely no relevance to ordinary club sailors like me, and probably most of you.

Edited by JimC - 13 Dec 13 at 4:28am
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yellowwelly View Drop Down
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Post Options Post Options   Quote yellowwelly Quote  Post ReplyReply Direct Link To This Post Posted: 13 Dec 13 at 7:29am
I know once I couldn't be arsed to put my undercover on to tow a boat to an event- big mistake, I went a lot slower as a result. Why is that? Just dirt from the road or is it the exhaust from the car?
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Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 13 Dec 13 at 8:38am
Or maybe just in your head? Not yours specifically, but I think most of us feel good about having a nicely finished, clean hull, and "feel fast". Not to be underestimated, that feeling.
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iitick View Drop Down
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Post Options Post Options   Quote iitick Quote  Post ReplyReply Direct Link To This Post Posted: 13 Dec 13 at 8:46am
I believe diesel is the main culprit, nasty sticky stuff. A friend of mine wraps polythene round his hull under the undercover because he thinks it gets through the fabric. Mind you he is a bit like that. Our undercovers are pretty filthy though. better on the cover than the boat.
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Post Options Post Options   Quote yellowwelly Quote  Post ReplyReply Direct Link To This Post Posted: 13 Dec 13 at 9:11am
It was a petrol car, but maybe I'd tailgated a truck or something.... but definitely a noticeable effect.
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