Rules & Regulations

International Measurement System IMS

IMS is measurement platform that defines measurement procedures and methods for measuring hull, appendages, propeller, stability, rig, sails, heavy items adn accomodation. The complete data set of IMS is intended to be used primarily for ORC International and ORC Club, but can also be used by other handicapping systems that wish to adjust their performance analysis or secret or public formulae. IMS is using ISAF Equipment Rules of Sailing (ERS) definitions and prescriptions where possible and may be easy understandable for any measurer having expirience in measuring different type and classes of yachts. The 2010 version include new simplified Cruiser/Racer regulations which replace former IMS Accommodation Regulations. Click here or on cover page to download PDF file.
 

ORC Rating Rules

ORC Rating systems (ORC International and ORC Club) use the International Measurement System (IMS) as a measurement platform and the ORC Velocity Prediction Program (VPP) to rate boats of different characteristics in size, hull and appendages shape and configuration, stability, rig and sails measurement, propeller installation and many other details affecting their theoretical speed. ORC Rating Rules includes limits and defaults for hull, rig, sails, crew, rules applying while racing, certificate layouts and description as well as complete explanation of different scoring options. Version 1.01 from 31.03.2010. include corrected misprints in rules 109.1, 113.4(b), 114.4(b). Click here or on cover page to download PDF file.
 

ORC VPP Documentation 2009 - (2010 version will be available soon)

The ORC VPP is part of three key elements to the current ORC handicap system: the International Measurement System (IMS) used to measure the boat, and it sails, spars, and appendages; the performance prediction procedure which determines the parametric inputs used by the VPP to predict sailing speed at different wind speeds and wind angles, and with different sails set; a race management system where the results of the VPP are applied to offer race handicapping, whether generalized or specific to the conditions of the race. The VPP Documentation describes the methodology of the equations used to calculate the forces produced by the hull, appendages, and sails, and how these are combined in the VPP. Click here or on cover page to download PDF file.

"Green Book"

ORC "Green Book" contains ORC Championship Rules that applies on the World and Continental Championships recognized by the ORC and ISAF. It defines procedures for application to host ORC Championship, obligations of the host organizing club and yachts qualifications and eligibilty. Four parts of the Green Book may be also downloaded as separate documents: ORC Championship Rules, Standard Notice of Race, Standard Sailing Instructions and ORC Classes. ORC Championship Rules are also recommended for regional and national championship as well as Standard Notice of Race and Sailing Instructions that may be used for any event using ORC Rating systems. Click here or on cover page to download PDF file of complete Green Book.