Yacht Handicaps
Printed From: Yachts and Yachting Online
Category: Keelboat classes
Forum Name: Keelboat news and development
Forum Discription: All the latest developments for yachts
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=12251
Printed Date: 12 May 25 at 12:34am
Software Version: Web Wiz Forums 9.665y - http://www.webwizforums.com
Topic: Yacht Handicaps
Posted By: NickA
Subject: Yacht Handicaps
Date Posted: 16 Dec 15 at 10:30pm
I had to do a risk assesment for a boat asking to sail on our lake this
week. Despite having no keel it counts as a cruiser (well it does have a
bed, so yes) .. I found a "CN" of 843 on this web site http://www.byronsoftware.org.uk/bycn/byboat.htm which I thought would be a PY equivalent.
However, that would make this "cruiser" seriously fast, somewhere between an RS700 and an RS800 dinghy. Similarly a massive cruising Cat (Bahia 46) is rated at 763 which would make it as fast as a 49er!
I guess I'm mis-interpreting the numbers? Or are these things really so fast?
Can someone explain please?
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Javelin 558
Contender 2574
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Replies:
Posted By: JimC
Date Posted: 17 Dec 15 at 10:36am
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Size matters... a 50ft boat will lollop along upwind fairly readily at 8 or 9 knots. Precious few dinghies can match that.
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Posted By: blueboy
Date Posted: 17 Dec 15 at 12:09pm
I have no idea how if at all the Byronsoft numbers relate to PY. However you might find http://www.rya.org.uk/racing/Pages/NHC.aspx useful as a source of cruiser handicaps (which are positively not PY numbers).
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Posted By: blueboy
Date Posted: 17 Dec 15 at 12:10pm
Originally posted by JimC
Size matters... a 50ft boat will lollop along upwind fairly readily at 8 or 9 knots. Precious few dinghies can match that. |
Precious few 50 footers on UK lakes, I think.
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Posted By: craiggo
Date Posted: 17 Dec 15 at 5:18pm
Byron uses a group of boats which had fairly static PYs under the Portsmouth scheme as a baseline. The rest of the boats are best fitted to the curve based on the measurements supplied. Be careful though, Byron does not produce a set of baseline numbers for a certain class of boat. The numbers on their website are an example of numbers provided for specific boats. So if your boat is heavier ie its carrying a full interior, full water tanks, puts and pans, you have a furling jib, a folding prop etc it will all make a big difference to your number.
For reference something like a Hunter Impala 28 will be between 920-970 depending on whether the owner declares a full no.1 or only ever uses a No.3.
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OK 2129
RS200 411
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Posted By: NickA
Date Posted: 17 Dec 15 at 10:32pm
The Byron site is a good resource. I finally found the correlation with RYA PYs on a linked page and it's very good; for certain boats at least. The Byron CN numbers are basically PY equivalents .. in theory at least.
But the handicaps still look unfairly low for quite a lot of boats.
Eg I've rented a Jeanneau Sun Oddysey (PY965 according to Byron) and we managed to get 9knots or so out of it in a force 5 (no kite mind), but in that wind my 3000 dinghy (PY978) would crack along at 13 knts.
I take the point about waterline length and displacement sailing - I guess in sub-planing winds those handicaps might be correct; but once a dinghy planes it will sail rings round most cruisers (TP52s etc excepted .. but they plane too, of course).
I don't think we'll be allowing the Corsair 24mk2 on our 2 mile long lake. I was concerned that it was being pushed out due to an unfairly low handicap, but it's also wide and (relatively) heavy - and once it gets up to speed.. pretty quick for something weighing 750kg (compared to my 3000 which weights 75kg all up).
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Javelin 558
Contender 2574
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