Rating Rules

IRC

IRC is a rating system based on a time-on-time calculation (TCC) of a boat’s elapsed time. It is a simplified rule and works on the basic principle that the faster the boat, the higher the TCC. IRC is considered a “secret” rule, the intention of which is to prevent the development of design-optimised boats that can take advantage of their rating.

Further information and full explanation of the rule can be found in the the IRC Yearbook or from the IRC website: http://www.ircrating.org/ 

More information, including applications and revalidations can be found HERE on the Australian Sailing website.

ORC

ORC Rating Systems use science and technology to develop its handicap systems. With a complete set of measurement of the hull with appendages, propeller, stability, rig and sails, it is then possible to use computer software called a VPP – for Velocity Prediction Program – to calculate the theoretical speeds for the boat in various wind conditions.

With this powerful tool, that is updated yearly by a panel of experts in aero and hydrodynamic science, the ORC rating system can tell you the performance differences between different boats in different wind conditions and course geometries.

More information, including applications and revalidations can be found HERE on the Australian Sailing website.

ORCi

ORCi is based on a complete boat measurement as defined by the International Measurement System (IMS).ORC Club uses the same data, but it may be accepted as being declared by the owner or obtained from any other source, including photos, drawings, designs or data from identical or similar boats.

More information, including applications and revalidations can be found HERE on the Australian Sailing website.