ORC Multihull Certificate
  ORC Multihull certificates come in four A4 pages. The first page gives a general overview of the boat with its rated boat speeds, in addition to the measurements of the main hull, the propeller, the rigging and the sail.

The second page is presenting the scoring options.
    Page 1 Page 2 Page 3 Page 4
 
The third page is showing a detailed list of measurements of the hull and appendages, propeller, rig, flotation, and the measurement inventory, while the fourth page is reserved for measurements within the sails inventory. 

Place the cursor over different parts of the certificate page for a brief explanation. More details are given in the measurement and scoring sections, while complete definitions can be found in the appropriate rules documents.
   
 


 
 


to the top ↑

RATING OFFICE

This is a space for the Rating Office logo. ORC Rating Offices are established worldwide in each country that has active offshore racing. Rating offices have several functions, including supervising the measurement and rating of yachts, supporting ORC racing by administering to their national fleets, and issuing ORC certificates.

Currently, ORC Multihull certificates are issued by the ORC Central Rating Office while this role will be given to the National Rating offices in the future.

HULL AND APPENDAGES

This section is showing the main Hull and Appendages measurements and hydorstatic calculations. Hull data includes the boat's primary characteristics while in measurement trim: Length overall, Maximum Beam, Draft and Displacement.

Additionally, superstructure frontal and lateral areas are shown
PROPELLER

Propeller data includes propeller installation (in aperture, strut drive or shaft) and type of propeller (solid, folding or feathering) followed by propeller diameter.

All measurements are shown for the Propeller and relevant installation together with Propeller Installation Projected Area (PIPA) as the main factor in calculating propeller résistance in the VPP calculations.
RIG

Rig measurements include the mast, boom and spinnaker pole and/or bowsprit. Mast is measured for halyards heights (P, IG and ISP), mast cross sections (MDT1, MDL1, MDT2, MDL2, TL, MW and GO) and mast weight and center of gravity (MWT, MCG).

The boom is recorded for its length and height (E, BD) as well as its height above sheerline at the mast.(BAS)

Foretriangle base (J) together with the measurement of stem to forward end of J (SFJ) determines position of the mast and sail plan, while the spinnaker pole and/or bowsprit are recorded with appropriate measurements (SPL or TPS).

For multiple foretraingles, relevant I and TP measurements are shown.
FLOTATION

This section includes measured freeboards (FAM and FFM) with the specific gravity (SG) that are used to define the measurement waterline. This is then used to determine displacement, wetted surface and the complete set of the boat's hydrostatic data.
INVENTORY

Measurement inventory is a record of all items on the boat during the flotation measurement. It is divided in two main sections: Tanks and Inventory
CERTIFICATE

ORC Reference number is a unique number identifying that certificate and may be retrieved in the ORC database available at the ORC Sailor Services.

There is an issue date as well as a VPP version used together with the latest date for the validity of the certificate.  

A boat shall have only one valid certificate at any one time. The valid certificate is the last one issued.

ORC Certificates are valid for one year. This is because the VPP software calculations are updated yearly based on the ITC’s latest research of aero and hydrodynamics, as well as improvements made from analysis of race results and boat performance during the racing season, and submissions made from ORC Nominating Bodies.