JCH RATING CALCULATION FORM

Introduction to the JCH rating system

Name of Yacht :

Build year :

Designer :

Design year (if different) :

Shipyard :

Class name :

Sail number :

usual place of sailing :


Bermudian mainsails with a gaff are prohibited.
For spinnakers and gennakers, only sewn polyamide is admitted.
Black color is not allowed for mobile spars : spinnaker boom, top mast, …

Type of boat :

rigging :   

keel  :

Boat from a regatta class, day boat and/or open boat : 

rudder  :

Vintage bonus (build and design) will be calculated.

Hull material :

Mast material : 

Boom material :

Material of mast or boom different from original : 

Material of other spar different from original :

Equipements :

Sails material :

propeller :

Mainsail battens : 

winches  ?

Specifications are in Meters and Tons for the displacement :

Lenght Over Deck  (LOD)  =

m

Length on the Water Line  ( LWL )  =

m
Specification Class 3 (for information only) :

Max width ( Bo )  =

m

1957 RORC Rating :

m

draft (maxi for set-in kell) =

m
Specification Class 4 (for information) :

displacement * ( D )  =

metrics tons

IOR Rating :

feets

* global weight (in metrics tons) without crew members

Sail mesurement specifications

Bermudians : foresail area   maxi (Genoa area or High cut jib area + Staysail area or flying jib area + Jib area + Staysail area)

genoa LL =

m

jib or staysail LL =

m

yankee LL =

m

genoa LP =

m

jib or staysail LP =

m

yankee LP =

m

Bermudians : Mainsail
Bermudians : mizzen

P =

m

P =

m

E =

m

E =

m

Gaffers : Foresails

staysail LL =

m

jib LL =

m

flying jib LL =

m

staysail LP =

m

jib LP =

m

flying jib LP =

m

Gaffers : mainsail
Gaffers : mizzen
Gaffers : Topsail

A =

m

A =

m

F =

m

B =

m

B =

m

G =

m

C =

m

C =

m

H =

m

D =

m

D =

m

E =

m

E =

m

Bermudians et Gaffers : largest downwindsail

SLE =

m

SHW =

m

SLU =

m

SF =

m

Mizzen staysail

SLE =

m

SHW =

m

SLU =

m

SF =

m

Fisherman

A =

m

C =

m

E =

m

B =

m

D =

m

Following informations will not be published.
We need them for more information in order to validate the rating .

EMAIL (to be informed about the rating certificate) :

Contact name :

Telephone number :

 

Illustrations for measurement of sails
All measurements are taken on the sails except P and E.
P and E shall be measured on the spars and, in case no measurement marks are available, the maximum dimension taking into account the rig and fittings will be measured.

Mainsails as well as mizzen and foresails areas of Bermudian yachts are calculated with a standard leach round of 15%.
Flying sails rigged between two masts (e.g. fishermen) are not taken into account in the foresails area.
If applicable, they have an impact on downwind sails.
The width at half height of a foresail is less than 50% of its base .

foresails

Spinakers

Mizzen Staysail

Fisherman

Illustrations relative to the measurement of the hull and to the keel types

- LOD Length over deck in metres : it is the maximal length of the hull, excluding pulpits, measured between two perpendiculars.
- LWL Length of waterline

Depending on the transom, measurements are illustrated below.

 

 

Long keel : is considered as a long keel when, as in the below example, the ratio K/LWL is higher than 60%. The owner must bring the proof –picture or plan – than confirms his demand.

Example of rudder separated from the keel (here with a classic keel, ie with garboard strake)