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Speed Ratings
The speed ratings are determined by the Portsmouth handicap system. This system, as explained by US Sailing is a
"time-on-time handicapping system and is derived from actual records of classes of boats
with thoroughly documented ratings. Portsmouth Numbers are defined as the length
of time boats would take to sail a common but unspecified distance.
The formula is easy to use:
CT (Corrected Time) = ET (Elapsed Time) X 100 / HC (Handicap)."
More information can be found at http://offshore.ussailing.org/Portsmouth_Yardstick.htm .
The following link will direct you to the Portsmouth tables:
http://offshore.ussailing.org/Portsmouth_Yardstick/Tables_2010/Centerboard_Classes.htm
The Basic Portsmouth Number (D-PN) for windmill is 89.5. The smaller the number, the faster the rating.
Here are the ratings for some of the centerboard boats compared to the Windmill:
420 (Int. or Club) 97.6 |
Albacore (15') 90.3 |
Blue Jay 108.6 |
Comet 91.7 |
Contender (Int.) 90.1 |
Coronado 15 91.9 |
Force 5 95.4 |
FJ (Int.) 97.9 |
Hunter 14 (JY14) 99.0 |
Hunter 170 no spin 92.7 |
Jet 14 97.2 |
Laser (Int.) 91.1 |
Laser 2000 92.5 |
Laser 4.7 (Int.) 95.4 |
Man O'War 99.4 |
Mariner 17 105.0 |
Moth 107.1 |
Optimist Pram (Int.) 123.6 |
Penguin 111.5 |
Rebel 96.9 |
Skipjack 93.1 |
Snipe (Int.) 91.9 |
Sunfish (Int.) 99.6 |
Tornado C/B 90.9 |
Vanguard 15 90.5 |
Viper 94.5 |
Wayfarer 91.6 |
Windmill 89.5 |
Zenith 91.4 |
Zuma 103.2 |
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