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YARDSTICK RATINGS for DINGHY, MULTIHULL & KEELBOAT CLASSES

WHAT IS A YARDSTICK RATING
The yardstick number is a performance rating between boat designs (classes).
A yardstick is not intended to provide a handicap figure for any individual skipper sailing that class.  Please refer to the Class Association or to a skipper’s home Club for personal handicaps or use the Back Calculated Handicap system described below.

Yachting SA  CLASS ASSOCIATION YARDSTICKS 
Yachting SA does not calculate current yardstick ratings.

Yachting SA recommends that Clubs & Classes refer to the Victorian Yardstick Ratings, which are recognised as the Australian reference for mixed fleet regattas.  Yachting Victoria annually reviews, proves and updates the Victorian Yardstick data to provide clubs with accurate figures for use in mixed fleet events.

 Where a class is sailed in “SA only” an estimated yardstick has been shown and similarly classes showing a date (eg 2003) mean no valid data has been available since 2003. This figure is a guide only and should not be relied on for major events.

Yardstick data can be viewed on the Yachting SA website (under Classes).
Click on the highlighted text (at right) for current Yachting SA 
Yardstick Ratings data.

The following codes are used to indicate the credibility of a yardstick value.
R = Reliable, P = Probable, T = Tentative,
SA only = YS allocated by Yachting SA for local class
2003 = no data since year shown.

This credibility rating is based on the amount of data received for that class.

HOW CAN YOUR CLASS YARDSTICK RATING BE CHANGED

The determination and application of yardsticks is well covered in YA Special Regulations, Addendum E of the YA Racing Rules of Sailing.

 A class yardstick can only be added or changed when valid race data is provided. Adjustment to the published yardsticks will only be considered if the request can be supported by substantial data from mixed fleet races between the classes requesting changes.

To check the accuracy and improve the quality of yardstick ratings Club and Class results are required.  Suitable events are State Heats, Regattas, Yardstick Events or any event where a mixed fleet of boats competes and an accurate comparison can be made between course lengths and finishing times of the competing boats. Ideally the results for the first three boats in each class are required, however all results are gratefully accepted.


Information required with the results (to give the results validity) are:

Ÿ  Name of Event/Regatta                Ÿ  Length of courses (most important)

Ÿ  Wind strength                              Ÿ  List of classes sailed on same courses

 

Clubs and Classes can provide race results data directly to the Victorian Yardstick Officer, c/- Yachting Victoria, PO Box 83, Sandringham, VIC 3191 or by facsimile to 03 9598 7384

Yachting SA would be pleased to also have a copy for our records and may review the YSA Yardstick Ratings if sufficient Clubs and Classes provide results from mixed fleet events.

Your contribution will be highly valued.
 

The following codes are used to indicate the credibility of yardstick value.
R = Reliable, P = Probable, T = Tentative, 2003 = no data since year shown.
This credibility rating is based on the amount of data received for that class.
Clubs and Classes can provide race results data directly to the Victorian Yardstick Officer, c/- Yachting Victoria, PO Box 83, Sandringham, VIC 3191 or by facsimile to 03 9598 7384
Your contribution will be highly valued.

TO USE THE YARDSTICK

A yardstick is used as a method of effectively handicapping or comparing the performance of different classes of boats; usually in mixed fleet events.

 

To obtain the corrected time (C) divide the boat’s true time (T), the elapsed time for the boat to sail the course, by the boat’s yardstick (Y) and multiply by 100.  ie. C = T/Y x 100.

Example:    The boat’s elapsed time is 160 minutes

                   The boat’s yardstick is 110

                   Corrected time is T/Y x 100 = 160/110 x 100 = 145.45 minutes.

ESTABLISHMENT OF BACK CALCULATED YARDSTICK (BCY).

For Club handicap racing, each boat/skipper combination can be given an individual handicap, which may be quite different from the Victorian or Yachting SA class yardstick.

To calculate a handicap for a boat/skipper combination, it is necessary to establish a Back Calculated Handicap. After each race a Back Calculated Handicap number is obtained representing the handicap that each boat/skipper combination would have required to bring all boat/skippers to an equal corrected finishing time.

This is done as follows:

One boat of proven consistent performance, which is known to have sailed a good race without any significant errors of judgement or technique, is selected to be the “Standard Boat” and her elapsed time is taken as the Standard Correct Time for that race.  The BCH for that boat in that race will be considered to be her class yardstick from the current YSA Yardstick Ratings. 

All other boats in the race are back calculated to find their BCH value. The BCH value for each boat/skipper combination is that number, which when multiplied by her elapsed time, would give each boat the same corrected time as the Standard Boat.

Thus to calculate a yacht’s Back Calculated Handicap (BCH) number:

Divide the yachts true time (T), the elapsed time for the yacht to sail the course, by the Standard Correct Time (S) and multiply by 100.  ie. BCH = T/S x 100.

Example:   
The yacht’s true time (T) is 135 minutes 
The Standard Correct Time (S) is 120 minutes 
Back Calculated Handicap (BCH) number is T/S x 100 = 135/120  x 100 = 112.50
 

FURTHER HANDICAPPING

 It is always these Back Calculated Handicap numbers, which are used as a basis for future handicaps.  The best three of the last five races (or similar ratio) are averaged to give a yacht’s handicap number for the next race.
Specially designed computer software is available or a simple spreadsheet (MS Excel or Lotus) or hand held calculators can be used to enable Race Committees and Handicappers to perform these calculations quickly, and the system almost entirely removes personal judgement from handicapping and permits a fine graduation of boat/skipper handicaps.  

ENQUIRIES:
The yardstick number is a performance rating between classes and is not intended as a handicap figure for any individual skipper currently sailing that class.  The yardstick ratings in this section are based on historical race result data supplied to Yachting Victoria by Clubs and Classes Australia-wide.

All enquiries about yardstick ratings should be referred to the Executive Officer, Yachting SA.

 

 

 

 

 

 

 

 

 

 

 

 

 

Other Links
 YSA Yardstick Ratings (Oct 2012)

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