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Sprint Bob View Drop Down
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Joined: 17 Jan 06
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Posts: 314 		Post Options Post Options   Quote Sprint Bob Quote  Post ReplyReply Direct Link To This Post Topic: SCHRS
    Posted: 16 Mar 12 at 12:42pm
The SCHRS  PY lookalike page needs to be treated with caution. It has not been updated to reflect the 2012 RYA PNs and the conversion factor is now a poor fit to the data with the new formula and the new RYA values.
Cheers
Bob
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Big-C View Drop Down
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Posts: 29 		Post Options Post Options   Quote Big-C Quote  Post ReplyReply Direct Link To This Post Posted: 10 Mar 12 at 8:01pm
All looks good although at least one error seems to have crept in
It appears my Unicorn has gone all modern and acquired an 800 mm square top main without me noticing - according to the data used to calculate its rating anyway
Little America's Cup C-Class K19 Emma Hamilton
A-Class Unicorn 1085
Merlin Rocket NSM2
SeaRay 260 OV
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Sprint Bob View Drop Down
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Posts: 314 		Post Options Post Options   Quote Sprint Bob Quote  Post ReplyReply Direct Link To This Post Posted: 10 Mar 12 at 6:59pm
I see that the SCHRS rating changes have now been posted.
Taking a casual look around  the SCHRS ratings on common cats we see:
Dart 18 rating has changed from 1.181 to 1.210 a change of plus 2.5%
Dart 18 (S/H) rating has changed from 1.186 to 1.237 a change of plus 4.3%
Dart 16X rating has changed from 1.226 to 1.237 a change of plus 0.9%
F18 rating has changed from 1.000 to .966 a change of minus 3.4%
F16 rating has changed from 1.008 to 0.989 a change of minus 1.2%
Prindle 15 rating has changed from 1.206 to 1.275 a change of plus 5.7% ( the biggest I noticed)
ShadowX rating has changed from 1.061 to 1.076 a change of plus 1.4%
Spitfire rating has changed from 1.041 to 1.033 a change of minus 0.08%
Topaz14Xtreme rating has changed from 1.238 to 1.233 a change of minus 0.04%
Inter17(19M2) rating has changed from 1.065 to 1.073 a change of plus 0.08%
Catapult rating has changed from 1.239 to 1.280 a change of plus 3.3%
HurricaneSX rating has changed from 1.006 to 1.019 a change of plus 1.3%
Standard Sprint 15 rating has changed from 1.32 to 1.376 a change of plus 4.2%
Sprint 15 Sport mode rating has changed from 1.218 to 1.258 a change of plus 3.4%

So in general dagger board cats with spinnakers get lower (faster) ratings while unarig skeg cats get bigger (slower) ratings. Looks good in the main, I guess time will tell. Well done to the SCHRS committee

Cheers

Bob



Edited by Sprint Bob - 10 Mar 12 at 7:00pm
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Scooby_simon View Drop Down
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Joined: 02 Apr 04
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Posts: 2415 		Post Options Post Options   Quote Scooby_simon Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 12 at 8:02pm
Loads been done; hopefully on the site in the next week or so.  Much work done.  I just got to comment this time around; others did all the work. 
Wanna learn to Ski - PM me..
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Big-C View Drop Down
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Posts: 29 		Post Options Post Options   Quote Big-C Quote  Post ReplyReply Direct Link To This Post Posted: 06 Mar 12 at 9:13am
I have a feeling curved boards and square tops are going to play a major part in the revisions
Little America's Cup C-Class K19 Emma Hamilton
A-Class Unicorn 1085
Merlin Rocket NSM2
SeaRay 260 OV
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Andymac View Drop Down
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Posts: 852 		Post Options Post Options   Quote Andymac Quote  Post ReplyReply Direct Link To This Post Posted: 06 Mar 12 at 9:07am
Originally posted by Owenfackrell

It is intresting (to me anyway) that the offical py for the dart 18 and the Hobbie 16 have them close but with the Hobbie slightly higher but SCHRS has them the other away around and much further apart. Is it just that they don't sail the way the formula works it out in the uk or is it something else?
 
I learnt from a post on the sprint15 forum that they may be looking at a more favourable rating allowance for boats that have skegs rather than centre/daggerboards i.e. Dart18 / Sprint15. 
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Owenfackrell View Drop Down
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Posts: 129 		Post Options Post Options   Quote Owenfackrell Quote  Post ReplyReply Direct Link To This Post Posted: 06 Mar 12 at 8:38am
It is intresting (to me anyway) that the offical py for the dart 18 and the Hobbie 16 have them close but with the Hobbie slightly higher but SCHRS has them the other away around and much further apart. Is it just that they don't sail the way the formula works it out in the uk or is it something else?
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catmandoo View Drop Down
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Posts: 545 		Post Options Post Options   Quote catmandoo Quote  Post ReplyReply Direct Link To This Post Posted: 06 Mar 12 at 8:34am
Originally posted by Andymac

[QUOTE=catmandoo]Now that RYA has published 2012 ratings , I would hope that SCHRS do same for us cats
 
is pretty much set in stone... "
 
 
Oh I wish !!! Wink, (but thats another story )
 
 the system administrators  of SCHRS are constantly evaluating their formula , fine tuning and "improving " as and when they see fit , boats evolve , new features appear, and as enlightened administrators they realise no handicapping sytem can be perfect so strive to iron out irregularities once sufficient data has proved discrepancies ,  these rule changes which change ratings , historically have been introduced , logically at the begining of a season .
 
As a performance indicator of the rule , Im sure that race results , times etc are heavily scrutinised and evaluated with much consideration .
 
This isnt the first update to the rule , i had a wee inkling ( read insight ) that another was to be published alongside updated ratings hence my request .
 
No measurement rule I know of "is set in stone "  our fellow lead mine sailors using irc will attest this , with RORC updating and fine tuning as circumstance require .
 
 
Many thanks to all that do the number crunching and head scratching in the persuit of providing a fair system for all in racing , cats , leadmines etc .
 
 


Edited by catmandoo - 06 Mar 12 at 8:41am
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Nacraman View Drop Down
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Posts: 50 		Post Options Post Options   Quote Nacraman Quote  Post ReplyReply Direct Link To This Post Posted: 06 Mar 12 at 7:38am
Originally posted by Andymac

Originally posted by Nacraman

New SCHRS table of revised ratings due on website very, very soon....

 
Oh, sorry am I wrong then?

You are right, but the formula has been revised...
"God bless those Pagans"-H.J.Simpson
"Beer, now there's a temporary solution"-H.J.Simpson

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Andymac View Drop Down
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Posts: 852 		Post Options Post Options   Quote Andymac Quote  Post ReplyReply Direct Link To This Post Posted: 05 Mar 12 at 9:56pm
Originally posted by Nacraman

New SCHRS table of revised ratings due on website very, very soon....

 
Oh, sorry am I wrong then?
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