Roosters Hull coatings...
Printed From: Yachts and Yachting Online
Category: Dinghy classes
Forum Name: Dinghy development
Forum Discription: The latest moves in the dinghy market
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=2251
Printed Date: 17 Aug 25 at 8:59am
Software Version: Web Wiz Forums 9.665y - http://www.webwizforums.com
Topic: Roosters Hull coatings...
Posted By: JimC
Subject: Roosters Hull coatings...
Date Posted: 28 Sep 06 at 5:24pm
If its falling off within a few races as that implies isn't in breach of rule 53?
It also sounds as if its polluting the water to me... |
Replies:
Posted By: Guest
Date Posted: 28 Sep 06 at 5:27pm
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How does that break 53? It's not ejecting or releasing just coated ... Agree on your second point. Rick ------------- |
Posted By: m_liddell
Date Posted: 28 Sep 06 at 7:28pm
| Didn't this come from Americas Cup boats? |
Posted By: laser47
Date Posted: 29 Sep 06 at 9:35pm
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it's just like a polishing compound really though isn't it ------------- |
Posted By: JimC
Date Posted: 30 Sep 06 at 12:42am
| Its the bit about it having to be replaced every few races which makes me wonder about the "ejecting or releasing" words in the rule. A polished surface doesn't need work until you scuff it up. I have a vision of people aerosol spraying their boat every morning of the champs with this stuff, and I don't like that vision much... |
Posted By: laser47
Date Posted: 30 Sep 06 at 7:31pm
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no you're right. that does sound bad ------------- |
Posted By: fizzicist
Date Posted: 30 Sep 06 at 8:07pm
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[QUOTE=JimC]. A polished surface doesn't need work until you scuff it up. QUOTE] Not so - look what happens to the paint on your car over the course of a couple of months, the water stops beading on it when you wash it. It's not been 'scuffed' as such and the same will happen to your hull. I suspect it's little more than a polish. ------------- Not all chemicals are bad. Without chemicals such as hydrogen and oxygen, for example, there would be no way to make water, a vital ingredient in beer. |
Posted By: MikeBz
Date Posted: 01 Oct 06 at 3:59pm
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If you spray something on which only lasts for a race or two then surely it's being released? But then you could apply the same argument to soft anti-fouling... Whatever, it's an awful thought that everyone would have to spray stuff onto the bottom of their boat every few races to be competitive. Let's hope it's a snake oil! Mike |
Posted By: Stefan Lloyd
Date Posted: 01 Oct 06 at 4:20pm
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I suspect it is a wax. Holmenkol is primarily a ski-wax company. Rooster is just the retailer. http://www.holmenkol.com/bilder/download/GB_AquaSpeed0.pdf?PHPSESSID=680616170a3b#search=%22holmenkol%20aquaspeed%22 - http://www.holmenkol.com/bilder/download/GB_AquaSpeed0.pdf?P HPSESSID=680616170a3b#search=%22holmenkol%20aquaspeed%22
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Posted By: Guest
Date Posted: 01 Oct 06 at 6:57pm
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A reduction in friction of 40% is a pretty bold claim ... if that is true we'll all be buying it... ------------- |
Posted By: fizzicist
Date Posted: 01 Oct 06 at 7:54pm
Just means it death rolls quicker on the run... ------------- Not all chemicals are bad. Without chemicals such as hydrogen and oxygen, for example, there would be no way to make water, a vital ingredient in beer. |
Posted By: Rupert
Date Posted: 01 Oct 06 at 9:36pm
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A reduction in friction of 40% starting at what point, though? Sanded with a belt sander with 40 grit on it? If 40% off an unsanded gelcoat finish, I'd like to know what reduction 1200 grit and car polish has?! ------------- Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686 |
Posted By: Isis
Date Posted: 01 Oct 06 at 9:47pm
I suspect that on a small section of hull surface then 40% reduction in friction could be acheived. For the hull as a whole ploughing through the water though then the difference would be far far smaller. When I was competatively racing kayaks then we'd wax our boats before big races and the difference was easily noticable. But I too have an image of entire championship fleets piling this stuff on before hitting the water and I dont like it much... ------------- |
Posted By: Stefan Lloyd
Date Posted: 02 Oct 06 at 8:49am
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It is "up to 40%" which isn't quite the same. Also, there are three forms of drag: friction, form and induced (vortices spinning off foil tips). How much of a boat's drag is actually friction? I don't know, but Bethwaite has a description of drag tests where the difference between a washed and unwashed hull was in the region of 2%. Also, drag from the rig and sails (which Bethwaite was not measuring) plays a major role in boat performance upwind. The point is even if it is "up to 40%", it is up to 40% of some quite small proportion of the overall drag.
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Posted By: CT249
Date Posted: 02 Oct 06 at 1:40pm
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A source I was looking at yesterday indicates about 60% of a 505's resistance at high planing speeds was skin friction. I don't think that was looking at upwind sailing so induced was negligible but there's wavemaking, form and friction as well. And the proportions vary a great deal according to speed. All the sources I can find (including the guys who design CAD CAM programmes, VPPs, designers, academics, etc) also underline that no one really knows, of course. Still, I don't know about you but we ban pollutants and this may come into that category. |
Posted By: Adam@LDC
Date Posted: 02 Oct 06 at 4:54pm
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It is all about Nano particle technology. It is all very interesting reading about the stuff. Basically the Holmenkol range got released into the UK market about 6 weeks ago. The AquaSpeed and Sport Polish, use nano particles which repells water. Therefore the water doesn't stick to the hull and meaning the hull has less friction with the water. Holmenkol also make lubricate, called LubenSpeed which also uses nano particles which is awesome. It doesn't rub off like holt lube and mclube and lasts ages. ------------- Retail Manager, LDC Racing Sailboats |
Posted By: timnoyce
Date Posted: 02 Oct 06 at 5:23pm
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Nano Particle Technology? Does that enable you to enter hyperspace?!
------------- http://www.facebook.com/bearfootdesign - BEARFOOT DESIGN Cherub 2648 - Comfortably Numb |
Posted By: mike ellis
Date Posted: 02 Oct 06 at 5:35pm
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sounds like it will cost a fortune if you have to do the whole hull every day. i can only see the realy competitive people bothering, that'll be the oppie fleet. and also i recall reading somwhere that friction caused by the hull rubbing against the water is hardly anything. its much more important to not a nice shape hull rather than a smooth finish. ------------- 600 732, will call it Sticks and Stones when i get round to it. Also International 14, 1318 |
Posted By: Isis
Date Posted: 02 Oct 06 at 5:41pm
Not sure about that... But ive heard licking your freshly coated hull enables the nano particles to enter your bloodstream and cure you of everything from the common cold to cancer within 6-8 working days. ------------- |
Posted By: Jack Sparrow
Date Posted: 02 Oct 06 at 7:34pm
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Oh my god Bill Joy's Grey Goo prediction is going to come ture!
------------- http://www.uk3-7class.org/index.html" rel="nofollow - Farr 3.7 Class Website https://www.facebook.com/groups/1092602470772759/" rel="nofollow - Farr 3.7 Building - Facebook Group |