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chic View Drop Down
Posting king
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Posts: 146 		Post Options Post Options   Quote chic Quote  Post ReplyReply Direct Link To This Post Topic: What is IRC?
    Posted: 17 Jan 07 at 6:06pm

Being a dinghy sailor I'm a novice to the intricacies of the IRC rating system. Although I understand the concept many posts here already assume a working knowledge of it.

Any enlightenment would be a step in the right direction.

Thanks!
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Stefan Lloyd View Drop Down
Really should get out more
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Posts: 1599 		Post Options Post Options   Quote Stefan Lloyd Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 07 at 6:46pm

Plenty to read on http://www.rorcrating.com/

Do you have a more specific question about it?

 
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chic View Drop Down
Posting king
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Posts: 146 		Post Options Post Options   Quote chic Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 07 at 6:58pm

I'm sure I will have after I've read more on the RORC website...

Thanks
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TimC View Drop Down
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Posts: 153 		Post Options Post Options   Quote TimC Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 07 at 12:10pm

I'm in a pretty similar position to you chic as I only started yachts a few years ago having raced dinghies for ages.

It seems a pretty good system though and I'm getting my head around it now. The whole optimisation thing is a bit beyond me at the moment though!
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chic View Drop Down
Posting king
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Posts: 146 		Post Options Post Options   Quote chic Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jan 07 at 9:11am

The RORC faq section answers about everything apart from the interesting question about how it is calculated...

Having worked for a sailmaker I understand the sail measurements but I'm curious to know what the critical hull measurements are. Some are obvious but some not.

If anyone can enlighten me with them I'd be grateful.
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Stefan Lloyd View Drop Down
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Posts: 1599 		Post Options Post Options   Quote Stefan Lloyd Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jan 07 at 10:59am

If you read the IRC handbook the hull measurements are shown. The "hull factor" is specified by RORC rather than measured. The actual formula is, of course, secret.

Optimisation is a black art. IRC is certainly susceptible to optimisation and does not claim to rate all boats "equitably", unlike IMS which made the claim but failed to live up to it. There is a lot of discussion on this topic on Sailing Anarchy, should you care to search for it. Don't believe half of what you read there! However John Corby and Mark Mills turn up from time to time and clearly know what they are talking about, as does "Jen" who works in the rating office.

 



Edited by Stefan Lloyd
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