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The Jauge Classique results from the 2007 merger of two handicap systems used in the Atlantic to have classic boats race against each other: Challenge Classique Atlantique and Belle Plaisance. The formula is particularly simple, using a limited number of measurements and characteristic descriptions for each boat, taking into account the age of the present hull

Each boat is allotted a Time Correction Factor (TCF). Real time is multiplied by this TCF to obtain the corrected time used for rating the competitors.

This system does not pretend to solve the impossible problem of giving equal chances to very different boats. The solution to this problem lies in utopia. The aim is to get different boats to race against one another, for pleasure. Experience shows, however, that this simple system actually increases the chances of older boats and avoids a fittings race.

This system is based on measurements of

  • hull length

  • length of waterline

  • weight of the boat

  • weight of the boat
  • rigging (masts and sails)
  • sail surface

and corrects the result depending on

  • the hull:

    • age and build

    • material used

    • shape of keel (with or without centreboard)

    • presence or absence of suspended rudder

    • type of propeller

  • the rig

    • form (masts and nature)

    • nature of sail material

    • presence or absence of battens

    • material of mast/boom

  Calculations are as follows:
R = C x ( L x S^[1/2] ) / ( 6 x D^[1/3] )

D = displacement (weight) in kg
L = theoretical length in metres
with ^[1/2] pour "square root" and ^[1/3] for "cubic root"

with L = Lwl + ( Lod - Lwl ) / 2

and

S = surface

where
L = theoretical length
Lwl = length at the waterline
Lod = length on deck
S = Maximum sail surface when beating + 0,5 additional surface downwind

and
C = C1 + C2 + C3 + C4 + C5 + C6 + C7

C is more or less close to 1.
C1 =Masts (cat-boat, sloop, cuter, ketch, yawl, schooner) and sail type (Bermudan, au tiers, gaff, houari, wishbone, latin)
 0,765 to 1
C2 = keel shape (dinghy, centreboard, classic, ...)
C2 = suspended rudder
 -0,15 to +0,2
0,1

C3 = mast material
C3 = sail material
C3 = battens
C3 = no winches

 0 to 0,2
-0.15 to 0,05
-0,03 to 0,05
-0,05
C4 = hull material -0,05 to 0,1
C5 = propelle type 0 to -0,05
C6 = age allowance for hull -0,10 to +0,05
C7 = penalty for hulls designed for racing 0,15

The final factor is TCF= ( 0,45 + 0,155 R^[1/2] )

The Jauge Classique is declarative. The declaration is made online. Boat characteristics and sail measurements must be supplied.

This data is grouped in a handicap certificate made available online.

In order to allow for the transition from the former Belle Plaisance system to Jauge Classique with detailed sail measurements it will be possible, for the 2007 season, to obtain a TCF with only the total surface when beating and additional surface downwind. This BP07 factor will be calculated as JC07 but will not result in the issue of a certificate.

    
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