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The Migration From ASPNTo PHRF NS Prepared By: Rod Stright Prepared for: NSYA Handicap Committee April 28, 2009.

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Presentation on theme: "The Migration From ASPNTo PHRF NS Prepared By: Rod Stright Prepared for: NSYA Handicap Committee April 28, 2009."— Presentation transcript:

1 The Migration From ASPNTo PHRF NS Prepared By: Rod Stright Prepared for: NSYA Handicap Committee April 28, 2009

2 1.Objective of Presentation The purpose of this presentation is to provide sailors across Nova Scotia with an understanding of the new PHRF NS rating system and the process used to get there from our old handicap system ASPN.

3 2.The History of ASPN Started as a Local Handicap system after WW IIStarted as a Local Handicap system after WW II ASPN - Atlantic Speed Potential NumberASPN - Atlantic Speed Potential Number Was refined and developed into ASPN under Mike EamesWas refined and developed into ASPN under Mike Eames ASPN is a derivative of US Sailing PHRFASPN is a derivative of US Sailing PHRF Is a time on time handicap system as opposed to a time on distance systemIs a time on time handicap system as opposed to a time on distance system Has been in use for more than 40 years in its present formatHas been in use for more than 40 years in its present format Has been used in reviewing the performance of yachts racing in Nova Scotia during those 40+ yearsHas been used in reviewing the performance of yachts racing in Nova Scotia during those 40+ years Unique to Nova ScotiaUnique to Nova Scotia

4 3.The History of PHRF PHRF - Performance Handicap Racing FleetPHRF - Performance Handicap Racing Fleet The standard keelboat handicapping system used throughout North AmericaThe standard keelboat handicapping system used throughout North America Handicaps are adjusted based upon observed performance on the race courseHandicaps are adjusted based upon observed performance on the race course PHRF ratings are derived based upon the difference in seconds per mile between a scratch boat and the rated boat sailing over a one nautical mile circular coursePHRF ratings are derived based upon the difference in seconds per mile between a scratch boat and the rated boat sailing over a one nautical mile circular course PHRF Ratings are Time on DistancePHRF Ratings are Time on Distance

5 4. Moving to PHRF Time on Time Time on distance racing still has its place Most areas prefer Time on Time racing as it is a fairer system of handicap racing over shorter courses and it better addresses a larger handicap spread To get to Time on Time PHRF from Time on Distance there is a “Time Correction Formula” TCF = A / (B + PHRF) A = doesn’t change results selected to give the mid boat a TCF of 1 B = number of seconds to sail one mile in expected conditions NSYA Recommended values A 695 and B 525 Clubs may use what they want TCFs are posted on NSYA website under view button

6 5. Advantages of PHRF Well documented system Well documented system Recognized all over North America Recognized all over North America A lot of work has already been done A lot of work has already been done ASPN some serious flaws (skew and limitations due to handicap spread) ASPN some serious flaws (skew and limitations due to handicap spread) Ease of reference on boats Ease of reference on boats Flexibility to go to Time on Distance if desired Flexibility to go to Time on Distance if desired Flexibility to adjust B Factor for certain type of races (port to port, windward/leeward etc.) Flexibility to adjust B Factor for certain type of races (port to port, windward/leeward etc.) Finer adjustments and more of them if desired Finer adjustments and more of them if desired

7 6. The Decision to Go PHRF NS On October 7, 2008, the NSYA Board of Directors approved the recommendation of the Handicap Committee to convert from our current ASPN system to a PHRF Time-on-Time system.On October 7, 2008, the NSYA Board of Directors approved the recommendation of the Handicap Committee to convert from our current ASPN system to a PHRF Time-on-Time system. 2/3 support from member clubs was a requirement2/3 support from member clubs was a requirement Conditions associated with the decision: PHRF format, PHRF format, Time-on-Time racing. Time-on-Time racing. Existing relationship between boats in our fleet to be maintained Existing relationship between boats in our fleet to be maintained will not adopt ratings from other areas but will continue to provide our own ratings, will not adopt ratings from other areas but will continue to provide our own ratings, forty years of local experience forty years of local experience active participation of our Handicap Committee. active participation of our Handicap Committee.

8 7. The Processes to Obtain PHRF NS Ratings List of Boats with well-established ASPN ratings and well established ratings in other areas of North America was generated.List of Boats with well-established ASPN ratings and well established ratings in other areas of North America was generated. List was further reduced to a dozen between 100 and 144 ASPNList was further reduced to a dozen between 100 and 144 ASPN Current PHRF numbers for this list of boats were obtained from five representative areas across North AmericaCurrent PHRF numbers for this list of boats were obtained from five representative areas across North America An average PHRF number was then calculated for each listed boat based on the PHRF numbers from these other areasAn average PHRF number was then calculated for each listed boat based on the PHRF numbers from these other areas Another list was generated comparing the ASPN numbers for the list of boats to the PHRF numbers for the same list of boats.Another list was generated comparing the ASPN numbers for the list of boats to the PHRF numbers for the same list of boats. Mathematically curve was then generated that compared PHRF numbers to ASPN numbers (90-151)Mathematically curve was then generated that compared PHRF numbers to ASPN numbers (90-151) Final list was generated that translated ASPN base numbers to PHRF base numbersFinal list was generated that translated ASPN base numbers to PHRF base numbers

9 8. PHRF Adjustments Only the adjustments applied under the ASPN System were usedOnly the adjustments applied under the ASPN System were used Similar adjustments were reviewed for the 5 selected PHRF areasSimilar adjustments were reviewed for the 5 selected PHRF areas Comparative adjustment analysis for the five PHRF areas with ASPNComparative adjustment analysis for the five PHRF areas with ASPN New PHRF NS adjustments determined by unanimous agreement of the NSYA handicap committee.New PHRF NS adjustments determined by unanimous agreement of the NSYA handicap committee.

10 9. Points to Keep in Mind When ASPN was originated the ratings were between 90 and 120, now they are between 90 and 153.When ASPN was originated the ratings were between 90 and 120, now they are between 90 and 153. Under ASPN I ASPN point was 6 sec/mile at the low end (100) and 3 sec/mile at the high end (Unfair)Under ASPN I ASPN point was 6 sec/mile at the low end (100) and 3 sec/mile at the high end (Unfair) ASPN was based on PHRF in the first place but using a B factor of 400 which is for a port to port downwind race. This favored the slower boats a lotASPN was based on PHRF in the first place but using a B factor of 400 which is for a port to port downwind race. This favored the slower boats a lot PHRF have finer adjustments and are usually 3 sec/milePHRF have finer adjustments and are usually 3 sec/mile PHRF NS has now 1 sec/mile differences in ratingsPHRF NS has now 1 sec/mile differences in ratings In one design racing the first boat usually beats the middle boat by 18 sec. Given that 1 sec/mile cannot be measuredIn one design racing the first boat usually beats the middle boat by 18 sec. Given that 1 sec/mile cannot be measured Base Rating Relationship between boats racing here has been maintainedBase Rating Relationship between boats racing here has been maintained

11 9. Points to Keep in Mind (Cont’d) PHRF NS ratings cannot be compared directlyPHRF NS ratings cannot be compared directly Each PHRF area has different PHRF Ratings as well as different fleet mixes, different sailors, different wind conditions, different currents and different sea states.Each PHRF area has different PHRF Ratings as well as different fleet mixes, different sailors, different wind conditions, different currents and different sea states. 1 sec/mile is 0.17 ASPN points which is negligible1 sec/mile is 0.17 ASPN points which is negligible Under ASPN a higher number was fasterUnder ASPN a higher number was faster Under PHRF a lower number is fasterUnder PHRF a lower number is faster Under ASPN the adjustments were made to the Time Correction FactorUnder ASPN the adjustments were made to the Time Correction Factor Under PHRF the adjustments are made to the base ratingUnder PHRF the adjustments are made to the base rating ASPN had built in B factor that selected Tanzer 22 as median boat NSYA median boat under PHRF is is C&C30ASPN had built in B factor that selected Tanzer 22 as median boat NSYA median boat under PHRF is is C&C30

12 10. Scoring Results PHRF NS Options are: A.Sailwave B.Excel C.Winregatta

13 10. A Sailwave Comprehensive Race Scoring softwareComprehensive Race Scoring software Available free from (www.sailwave.com)Available free from (www.sailwave.com) Worldwide softwareWorldwide software Continually updatedContinually updated Most widely used race scoring software available today for sailboat racingMost widely used race scoring software available today for sailboat racing Well suited to PHRF and can import all data requiredWell suited to PHRF and can import all data required User’s Guide developed and supplied by NSYAUser’s Guide developed and supplied by NSYA

14 10. A Sailwave

15 10. B Excel Custom sheet developed by NSYACustom sheet developed by NSYA Local systemLocal system Widely available programWidely available program Not racing systemNot racing system SimpleSimple Can be used when other systems not available (backup)Can be used when other systems not available (backup)

16 10. B Excel

17 10.CWinregatta Been in use for a long timeBeen in use for a long time Users familiar with systemUsers familiar with system UnsupportedUnsupported Requires conversion of TCF to %Requires conversion of TCF to % Will fail as time progressesWill fail as time progresses NO LONGER AVAILABLENO LONGER AVAILABLE

18 10. C Winregatta

19 11. Conclusions 1.ASPN has served us well but needs to go 2.Winregatta has done likewise but will not be supported 3.Time on Time racing is the best match to handicap racing available in North America 4.No handicap system is perfect 5.40 year performance history of ASPN has been preserved 6.The migration has been complicated and there will be growing pains and teething problems

20 12. NSYA Recommendations Clubs should move to PHRF NS as soon as possible, 2010 is mandatory – ASPN will be gone in 2010 -Clubs should move to PHRF NS as soon as possible, 2010 is mandatory – ASPN will be gone in 2010 - Use the system as recommended for 2009Use the system as recommended for 2009 Move from Winregatta to Sailwave in conjunction with move to PHRF NSMove from Winregatta to Sailwave in conjunction with move to PHRF NS Accept the fact that no handicap system is perfectAccept the fact that no handicap system is perfect Issues should be reported to the Club handicappers as promptly as possible.Issues should be reported to the Club handicappers as promptly as possible. Remember we are moving from a system that is very coarse to one that is very fine 1 sec =.17 ASPN pointRemember we are moving from a system that is very coarse to one that is very fine 1 sec =.17 ASPN point Sail fast have funSail fast have fun

21 Info on NSYA website www.nsya.ns.ca/www.nsya.ns.ca/ Under PHRF RacingUnder PHRF Racing Yacht RatingsYacht Ratings Base ratingsBase ratings AdjustmentsAdjustments PHRF NS (explanation)PHRF NS (explanation) Etc.Etc.

22 Presented by: NSYA Handicap Committee Volunteers not professionals Not paid Supporting our sport If you like it tell your friends If you have a problem tell your handicapper who is also your NSYA Handicap Committee Rep


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