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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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