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catmandoo View Drop Down
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Post Options Post Options   Quote catmandoo Quote  Post ReplyReply Direct Link To This Post Topic: SCHRS
    Posted: 05 Mar 12 at 1:45pm
Now that RYA has published 2012 ratings , I would hope that SCHRS do same for us cats , my clubs racing kicks of 1st April and it would be nice to start off the season with ratings that can be used all year , there isnt any news on SCHRS site , but cat sailing does seem to be an undercover dark art  Wink

Many thanks to those working away in the background on this 
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Post Options Post Options   Quote Multiplex Quote  Post ReplyReply Direct Link To This Post Posted: 05 Mar 12 at 5:36pm
Hi.

Anyone got an address for Nick Dewhirst please?  I just keep being returned when I use the form on the SHCRS site!

Thx!

Gordon.

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Andymac View Drop Down
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Post Options Post Options   Quote Andymac Quote  Post ReplyReply Direct Link To This Post Posted: 05 Mar 12 at 9:45pm
Originally posted by catmandoo

Now that RYA has published 2012 ratings , I would hope that SCHRS do same for us cats
 
I thought that SCHRS was formulaic rather than based on analysis of race results.
The rating is achieved by a formula which in essence takes into account the dimensions and characteristics of the boat and once reached it is pretty much set in stone... unless you modify the boat in some way. Below is a small extract which can be found at http://schrs.com/index.php 
C.3.1 Rated Measurements
  • Rated Length (after Jan 1st 2007) L = AL

  • Rated Length L (before Jan 1st 2007) = WL + 0.3(AL - WL)

  • Rated Weight W = WS + WC

  • Rated Sail Area A = M + J

  • Rated mainsail Area M = CM x ME

  • Rated Jib Area J

  • Multihulls without spinnaker J = CJ x JE
  • Multihulls with spinnaker J =(CJ x JE) + 10% x (CSPI - CJ)

  • ME = Mainsail efficiency*
  • JE = Jib efficiency*

  • * Sail efficiency (%):

  • Sail efficiency
  • where:
  • Aspect Ratio
  • and aspect ratios are:
  • Main Aspect Ratio and Jib Aspect Ratio 
  • C.3.2 Intermediate calculations
    • Intermediate calculation ZM2
    • Intermediate calculation DLR
    • Intermediate calculation XC4
    • Intermediate calculation XC2
    • Intermediate calculation XC2
    • Intermediate calculation XC
    C.3.3 Corrections and Penalties
    • Board Correction is:

    • Board Correction

    • and aspect ratio is:
    • Board Aspect Ratio
  • Main Aspect Ratio and Jib Aspect Ratio
    C.3.4 Power Factor
    • where the Power Factor takes into account the Heeling and Righting moments as follows:

    • Intermediate POWFAC

    • where Heeling moment is:

    • Intermediate HMOM

    • Righting moment is:

    • Intermediate RMOM
    C.3.5 Rating (or Time Dividing Factor)
    • Rating (or Time Dividing Factor)

    • where rating will be calculated to 3 decimal places
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Nacraman View Drop Down
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Post Options Post Options   Quote Nacraman Quote  Post ReplyReply Direct Link To This Post Posted: 05 Mar 12 at 9:48pm
New SCHRS table of revised ratings due on website very, very soon....

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"Beer, now there's a temporary solution"-H.J.Simpson

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Andymac View Drop Down
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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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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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catmandoo View Drop Down
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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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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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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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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
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