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NickA View Drop Down
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Posts: 784 		Post Options Post Options   Quote NickA Quote  Post ReplyReply Direct Link To This Post Topic: Yacht Handicaps
    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?


Edited by NickA - 17 Dec 15 at 1:54pm
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JimC View Drop Down
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Posts: 6660 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 17 Dec 15 at 10:36am
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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Posts: 512 		Post Options Post Options   Quote blueboy Quote  Post ReplyReply Direct Link To This Post 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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Posts: 512 		Post Options Post Options   Quote blueboy Quote  Post ReplyReply Direct Link To This Post 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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craiggo View Drop Down
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Posts: 1810 		Post Options Post Options   Quote craiggo Quote  Post ReplyReply Direct Link To This Post 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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NickA View Drop Down
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Posts: 784 		Post Options Post Options   Quote NickA Quote  Post ReplyReply Direct Link To This Post 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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