Most interesting was a PDF Book download posted by the author Gary Baigent called "Lightweight Brigade". It is hidden away in the forum on about page 7 but I contacted Gary who gave me permission to use his PDF Book and so I've put a copy on my website so it won't disappear.
If you want a great read, download "Lightweight Brigade" by Gary Baigent, a 7.6MB file of 176 pages at www.coolmobility.com.au/Yacht/LightBrigade.pdf I realy enjoyed reading this book as Gary has an incredible knowledge and collection of photos and technical info that just doesn't exist elsewhere.
Post by Mystique R333 on Feb 25, 2010 16:30:13 GMT 10
Fair question. The quarter ton (around 25'), half ton (about 30') and 3/4 ton (about 35'), are an old racing formula called the IOR (International Offshore Rating) based upon length overall, waterline, beam, displacement, and sail area. It is similar to the twelve metre formulaof the old America's Cup boats - very complex and no relation to a single measurement.
Like Quarter Tonners are from about one ton (the ultralights with centreboards and ballast in the hull) to two tons in actual displacement. Holland 25 displaces about 1.6 ton.
The IOR ratings stopped being used or raced against each other in the '80s, but there has been a small resurgence of old IOR boats racing in England.
The main rating formula, that gives yachts a handicap value, for club racing yachts are now IRC, AMS, PHRF etc. Hope that helps.