ORC Multihull certificate Sample

A boat drawing that is proportionally scaled and includes measurements of the main rig and sail. The drawing may also feature other items depending on the specific rig and sail configuration.

• The rig configuration details vary with the input. Thus, the spreaders diagrammed match the spreader count, the standing rigging matches adjustable stays recorded, an inner forestay is shown if recorded and split rigs are shown with a mizzen together with appropriate dimensions.

• A bow sprit is shown if the headsail or asymmetric spinnaker can be tacked forward of the stem.

• The transom geometry will represent the actual boat's transom in various types that vary from the default reverse transom to options that have an outboard rudder.

• Asymmetrical spinnakers are shown according to the type declared for the yacht; i.e., the type which the rule requires to be tacked on the yacht’s centreline (with no pole aboard) or else an asymmetrical which may be tacked on a spinnaker pole.

• Measured sail areas are printed for the largest of each sail type.

• A cruising-type main with in-mast furler/reefer and/or a headsail furler/reefer is displayed if fitted.

As a result of VPP calculations predicted boat velocities for wind speeds in knots are given for a complete set of polars plot for different wind conditions between 6 – 20 knots of true wind speed from optimum beat, over 52, 60, 75, 90, 110, 120, 135, 150 degrees of true wind angle to the optimum run.

These predicted speeds can be easily used on a boat for comparison with real performance and, as it also shows Beat and Run VMGs with appropriate angles.

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 anyone 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.

Boat description data includes Class, Designer and Builder as well as Age and Series Dates

Age Date is the month and year of the first launching, while Series Date is the Age Date of the earliest boat of an unmodified series built in production moulds or jigs.

Offset file describes the file used for the complete hull and appendages' shape definition.

Hull data includes the boat's primary characteristics while in measurement trim: Length overall, Maximum Beam, Draft and Displacement. as well as Displacement to Length Ratio (DLR).

IMS Division (Performance or Cruiser/Racer) is defined by IMS Appendix 1 where Cruiser/Racers are boats designed for cruising and are equipped with accommodation layouts at least comparable to the standards of series production boats. Boats not meeting these requirements are categorized in the Performance division. For boats complying with the ORC Sportboat Class Rules, IMS Dvision is defined here as Sportboat.

Dynamic Allowance is a rating credit representing the dynamic behaviour of a boat taking into account performance in unsteady states (i.e., in heavy seas or while tacking). Age Allowance is a rating credit for age increasing each year up to a maximum of 15 years.

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

CREW, an important factor affecting the boat's performance, is considered in the VPP rating calculations.

The weight of all crew members on board while racing may have a Declared value specified by the owner, but if not declared a Default figure is calculated and listed on the certificate.

The crew shall not be heavier than the Maximum value recorded on the certificate. And if the Notice of Race or Sailing Instructions specify, then the crew weight shall not be less than the Minimum shown on the certificate.

Measured and rated sail areas are shown for the largest sails of each type recorded. Mainsail rated area will be increase from its measured value for the size of the roach and possible effect on the limit values of boom and mast diameters.

Headsails and spinnaker rated areas may be increased from the measured one when the measured area is smaller than respective minimum rated areas.