 
  2025
  90 Minute
  
  Portsmouth Yardstick -Pursuit Racing
 
  Pursuit Race Start time
  calculations
   
  Notes on using the
  spreadsheet
   
  To start, list all classes that are going to race
  in the class column with the slowest (Class with largest PN) first working to
  the fastest class. Next enter the relavant PN's in the PN column. Finally
  enter the race duration in minutes where highlighted in red. from here the
  diffrences in seconds will be given. these tell how much time after the first
  class each class must start. in the example class 1 starts first and then
  class 2 starts 162 seconds latter, class 3 311 seconds after class 1. etc. A
  club may choose to apply the difference from the "scratch" boat in
  either seconds or minutes as in column E or F.
 
  Class
  PN
  Race
  Duration

    (in Seconds)
  Ratio
  Difference (Seconds)
  Difference (Mins)
  Race
  duration

    (in minutes)
 
  Class
  Zero - ILCA 6 / Laser Radial
  1154
  5400
  0.213703704
  0
  0
  90
 
  Optimist
  1631
  7632
  0.213703704
  2232
  37
   
  Cadet
  1455
  6808
  0.213703704
  1408
  23
   
  RS Tera
  Sport
  1445
  6762
  0.213703704
  1362
  23
   
  Topper
  4.2
  1440
  6738
  0.213703704
  1338
  22
   
  Mirror
  D/H
  1380
  6458
  0.213703704
  1058
  18
   
  RS Tera
  Pro
  1370
  6411
  0.213703704
  1011
  17
   
  Topper
  1363
  6378
  0.213703704
  978
  16
   
  Laser
  Pico Race
  1330
  6224
  0.213703704
  824
  14
   
  Fusion
  Pro
  1290
  6036
  0.213703704
  636
  11
   
  Fusion
  Pro Spinnaker
  1275
  5966
  0.213703704
  566
  9
   
  RS Feva
  XL
  1244
  5821
  0.213703704
  421
  7
   
  ILCA 4 /
  Laser 4.7
  1216
  5690
  0.213703704
  290
  5
   
  Firefly
  1174
  5494
  0.213703704
  94
  2
   
  ILCA 6 /
  Laser Radial
  1154
  5400
  0.213703704
  0
  0
   
  Europe
  1140
  5334
  0.213703704
  -66
  -1
   
  Solo / RS
  Aero 5
  1139
  5330
  0.213703704
  -70
  -1
   
  Enterprise
  1137
  5320
  0.213703704
  -80
  -1
   
  2000
  1121
  5246
  0.213703704
  -154
  -3
   
  Wayfarer
  1109
  5189
  0.213703704
  -211
  -4
   
  ILCA 7 /
  Laser
  1104
  5166
  0.213703704
  -234
  -4
   
  Laser
  Stratos
  1103
  5161
  0.213703704
  -239
  -4
   
  Laser II
  1100
  5147
  0.213703704
  -253
  -4
   
  RS Aero 6
  1099
  5143
  0.213703704
  -257
  -4
   
  OK / RS
  Vareo / Laser Bahia
  1095
  5124
  0.213703704
  -276
  -5
   
  Laser
  3000
  1090
  5101
  0.213703704
  -299
  -5
   
  Laser
  Vago XD
  1071
  5012
  0.213703704
  -388
  -6
   
  RS Aero 7
  1063
  4974
  0.213703704
  -426
  -7
   
  RS 200 /
  Fire
  1050
  4913
  0.213703704
  -487
  -8
   
  Phantom
  (<999)
  1047
  4899
  0.213703704
  -501
  -8
   
  Blaze
  1030
  4820
  0.213703704
  -580
  -10
   
  Merlin
  Rocket (3157-3330)
  1013
  4740
  0.213703704
  -660
  -11
   
  RS Aero 9
  1005
  4703
  0.213703704
  -697
  -12
   
  Phantom
  (>1100)
  998
  4670
  0.213703704
  -730
  -12
   
  Halo
  992
  4642
  0.213703704
  -758
  -13
   
  Merlin
  Rocket (3554+)
  983
  4600
  0.213703704
  -800
  -13
   
  Contender
  969
  4534
  0.213703704
  -866
  -14
   
  RS 300
  965
  4516
  0.213703704
  -884
  -15
   
  Fireball
  959
  4488
  0.213703704
  -912
  -15
   
  RS 400
  942
  4408
  0.213703704
  -992
  -17
   
  ISO
  928
  4342
  0.213703704
  -1058
  -18
   
  Laser
  4000
  923
  4319
  0.213703704
  -1081
  -18
   
  RS 600
  921
  4310
  0.213703704
  -1090
  -18
   
  International
  Canoe OD
  905
  4235
  0.213703704
  -1165
  -19
   
  29er
  900
  4211
  0.213703704
  -1189
  -20
   
  B14
  858
  4015
  0.213703704
  -1385
  -23
   
  Musto
  Skiff
  834
  3903
  0.213703704
  -1497
  -25
   
  RS 800
  799
  3739
  0.213703704
  -1661
  -28
   
  Waszp
  570
  2667
  0.213703704
  -2733
  -46