Leigh & Lowton PY Numbers 2013

 
Race data from our various handicap series has been input to the 
RYA website and their systems have analysed the data and produced
suggested PNs for classes at L&LSC.  Basically, the RYA compute 
the average corrected time for a race and then for each class 
within it. This shows what change in each class handicap would be 
needed for their average corrected times to all be the same. 
Poor performers (outside 20%) are automatically excluded before
class handicaps are computed by the RYA. That is intended to 
prevent undue influence from those who were late to the start, 
having a really bad day or simply new to the sport or the boat. 
Movements in class PNs are weighted so that a small the number 
of results for any class do not have an undue influence compared 
to those with large numbers of results.

After inputting all the data available, for all the series’ 
back to 2007 (currently 600 races with thousands of results), 
the RYA has produced a list of Leigh & Lowton specific 
Portsmouth Numbers – for all those classes with sufficient data 
available.

They have also give a confidence level. ‘Confidence Factor 
(c.f.)’ refers to the stability of the number – not its accuracy. 
Confidence in the stability of PNs obviously rises as more race
 data is input and as we are in the first year of this process 
we decided to recognise the likelihood of increasing confidence, 
and so the Sailing Committee has agreed that the changes 
recommended by the RYA for L&LSC will be ‘damped’ by applying a 
% adjustment. Depending on the confidence level the % of any 
change applied will be as follows

0.0 c.f. = 0 % RYA Number to be used,
0.1 c.f. = 20%,
0.2 c.f. = 40%,
0.3 c.f. = 60%,
0.4 c.f. = 80%,
0.5 c.f. = 100%

Below is the RYA 2013 List with the amendments for the 
LLSC 
PY numbers approved by the RYA:
 
 

Class	2013 PY	Class	2013 PY	Class	2013 PY
420	1100	HORNET	973	OSPREY	944
505	902	HURRICANE 5.9	689	PHANTOM	1023
29ER	922	INTERNATIONAL 14	780	ROOSTER 8.1	1050
49ER	740	ISO	924	RS 100 10.2	992
A CLASS	681	J 80	876	RS 100 8.4	1000
ALBACORE	1055	J24	935	RS 200	1051
B14	870	JAVELIN	926	RS 300	980
BLAZE	1032	K1	1062	RS 400	940
BRITISH MOTH	1164	KESTREL	1040	RS 500	975
BUZZ	1003	LARK	1071	RS 600	920
BYTE	1190	LASER	1074	RS 700	860
BYTE CII	1146	LASER 2000	1090	RS 800	820
CADET	1432	V 3000	1007	RS FEVA XL	1210
CANOE INTERNATIONAL	870	LASER 3000	1047	RS K6	903
CANOE INTERNATIONAL	905	LASER 4.7	1180	RS TERA SPORT	1451
CHALLENGER	1174	LASER 4000	911	RS VAREO	1052
CHERUB*	920	LASER 5000	846	RS VISION	1096
COMET	1190	LASER BAHIA	1055	SCORPION	1044
COMET DUO	1178	LASER EPS	1024	SOLO	1147
COMET TRIO	1085	LASER II	1035	SOLUTION	1077
COMET ZERO	1250	LASER PICO	1300	SPITFIRE	712
CONTENDER	982	LASER PICO RACE	1265	SPRINT 15	917
D1	953	LASER RADIAL	1109	SPRINT 15 SPORT	886
DART 16	863	LASER STRATOS	1092	SQUIB	1142
DART 18	805	LASER VAGO XD	1064	STREAKER	1153
DEVOTI ONE	953	LASER VORTEX	945	SUPERNOVA	1070
ENTERPRISE	1108	LIGHTNING 368	1154	TASAR	1018
EUROPE	1148	MARAUDER	1042	TEMPEST	942
FINN	1053	MERLIN ROCKET	994	TOPAZ UNO	1236
FIREBALL	975	MIRACLE	1188	TOPPER	1333
FIREFLY	1168	MIRROR	1385	TOPPER CRUZ	1040
FLYING FIFTEEN	1020	MIRROR MARAUDER	1042	TOPPER MAGNO	1175
FORMULA 18	693	MOTH INTERNATIONAL	600	TOPPER XENON	1079
GP14	1127	MUSTO SKIFF	860	TORNADO	644
GRADUATE	1141	NATIONAL 12	1071	WANDERER	1150
HERON	1345	OK	1106	WAYFARER	1101
HOBIE 16	805	OPTIMIST	1664	WETA	930