IRC Rating Secret Formula - With yacht?s built before 2000, and with the core racing fleet at this time being moderate displacement cruiser/racers between 30 to 40 ft, the IRC model gives very consistent results with similar boats (size and SA/D , DLR) and works really well. READ MORE

IRC Rating Dufour Dufour 34 Performance Cruiser - The IRC Rating LL/P anomaly. Following on from my study of Dufour Performance Cruisers vs. various regression rating systems (including IRC), with the sometimes huge variances between Dufour 34 Performance Cruiser and similar yachts such at X-34, and also compared to the the data IMS type VMG models. READ MORE

IRC Rating LL/P Performance Cruisers - The IRC Rating LL/P debate. Following on from my study of Performance Cruisers vs. various rating systems (including IRC), and the sometimes huge variances between similar yachts and on the water performances as well as to IMS type VMG models. Most single number regression formula?s use a combined sail area in model (with various weightings such as main at 100% and foresail at 60% to allow for upwind tacking, and 40% for downwind with spinnaker).READ MORE

This Sailing Handicap System offers a sailing and yachting rating system whereby yacht and sailboat peformances are estimated on a comparative sailing speed and VMG racing comparative, with yacht ratings and handicaps determined to work out yacht speeds so that sailboats can race against each in yachting events and the handicaps allow sailboats to race with equal chance in yacht race and in sailing regatta results without unfair advantage or bias in yacht rating corrected time results.READ MORE