The following Rating information is provided by Yachting Australia
IRC - General Information
What is IRC?
This page will provide you with information on what the rule is and how it works, help you decide if IRC is the right rating system for your boat, and provide you with information on how to get your boat measured and apply for a certificate.
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 principal 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.
Why use IRC?
IRC rates measured data such as a boat's weight, length, draft and sail area, as well as special features like water ballast, canting keels and bowsprits to allow a wide range of keelboats to compete against each other on a similar playing field.
Principles of IRC
IRC is generally considered a self-measurement rule; however, the practice of using Endorsed certificates is considered the norm in Australia. Endorsed certificates require that all rated information on the certificate has been audited by an accredited
official and confirmed by measurement. Boats with an endorsed certificate must also be weighed on certified scales.
Any changes made to a boat after its initial rating has been supplied must be declared by the owner so that the rating is still current and applicable.
IRC also applies an age allowance factor to a boat's rating. This is automatically applied after 3 years and uses the average of the series and age date in its calculation.
Boats are individually rated so boats of the same or similar design will not necessarily have the same rating. Some standard measurements can be used for boats of a standard design but rig and sail measurements will always have to be taken. Only boats of a valid OD class can source data from a sistership certificate.
Further information and Forms can be downloaded from the Yachting Australia Website
ORC - General Information
The ORC (International Measurement System) is maintained by the Offshore Racing Congress.
Their website can be found at: www.orc.org
International Measurement Systems IMS
The International Measurement Systems (IMS) document outlines the measurement regulations behind the ORCi and ORCc rating systems.
Measurement for ORCi is separated into 6 measurement areas:
APPENDAGES (centerboard, canting keel, bilge boards, trim tabs)
PROPELLER (types and installations)
STABILITY (measurement trim, freeboards, inclination, water ballast) RIG (measurements, weight and centre of gravity)
SAILS (measurement and inventory)
Boat owners with carbon rigs should read carefully the measurement requirements in section F - RIG outlining rig weight and centre of gravity requirements for this measurement rule.
ORC Rating Systems - ORC International & ORC Club
ORC Rating systems 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 sail measurements, propeller installation and many other details affecting their theoretical speed.
Certificates may be issued for ORC International for boats that are completely measured in accordance with the IMS and complying with their requirements of the IMS Rules and Regulations.
ORC Club certificates may be issued with less complete IMS measurement where measurement data may be declared and/ or obtained from other sources.
Further information and Forms can be downloaded from the Australian Sailing Website:
Performance Handicaps (PHS)
Alfred’s Performance Handicap System (APHS) will be used across all racing at the club, from Wednesday non-spinnaker racing through to Saturday spinnaker racing.
All boats will have a non-spinnaker handicap and where applicable, a spinnaker handicap as well. Any amendment to a spinnaker handicap will not necessarily follow through to the non-spinnaker handicap and vice versa.
- All members are encouraged to read "A Sailors Guide to Handicapping" document.
The Handicap Sub-Committee are empowered to establish a base handicap which in turn the automated handicap system makes adjustments + or – based on a boats performance against other boats within her fleet.
When allocating boats to a particular fleet, the emphasis will be on the handicap & performance of a boat. The allocation of a boat into a fleet is conducted by the Handicap Sub Committee and the Race Committee; a boat may not select its own fleet in which it wishes to sail.
Any change of skipper or increase in sail area (e.g. inclusion of mast head spinnakers) must be notified to the Sailing Office at least 24 hours prior to the appropriate race start and an amended handicap may result. Failure to do so may result in disqualification.