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Rating rules shaped our boats - Good Old Boat
https://goodoldboat.com/rating-rules-shaped-our-boats/#:~:text=Sail%20area%20was%20not%20included%2C%20of%20course%2C%20nor,stempost%20to%20sternpost%20and%20B%20%3D%20maximum%20beam.%29
VPRS yacht measurement guide - for yacht rating
https://vprs.org/measurements.html
For yachts with an outward-sloping transom which is out of the water, first drop a vertical line from the aft-most point of the hull. Then project the underside of the hull and mark the point where it intersects with the vertical line. Measure the vertical height from the water to this point.
How Yachts Are Raced - Shipping Wonders of the World
https://www.shippingwondersoftheworld.com/yacht_racing.html
The International Yacht Racing Union Rule of 1920 is intricate in its measurements, but its results resemble those of the “length by sail area over 6,000” rule to which reference has already been made.
YRSA - AMS
https://www.raceyachts.org/
Welcome to AMS & SMS. When the Australian Measurement System (AMS) was created in 1997, most racing keelboats were being designed to the IMS rule, which was rapidly declining throughout the world and particularly in Australia. Over the years the fleet changed dramatically and most designs are now optimised to a single figure, time on time correction rating system.
Racing Yacht Rules: A Primer - Professional BoatBuilder …
https://www.proboat.com/2015/03/racing-yacht-rules-a-primer/
The International Measurement System is a velocity prediction program (VPP) that uses measurements of the entire hull shape as taken …
VPRS yacht rating: home
Velocity Prediction Rating System VPRS enables ballasted monohull yachts including sportsboats to race fairly against one another by applying Time Correction Coefficients (TCCs) to elapsed race times. The TCCs are generated by a Velocity Prediction Program (VPP)—software that calculates a boat's potential performance in a range of wind conditions.
Q Class Yachts :: Measurement Rule
https://www.qclassyachts.com/measurement/index.html
A new version of the Universal Rule of Measurement, under which new construction Q boats will race level, without handicap handicap system based on a proven velocity prediction program (Vpp), under which both new and vintage boats can race together with time allowance; this system is similar to the one used very successfully by the J Class today
How Racing Rating Rules Work (and how to maximize …
https://www.quantumsails.com/en/resources-and-expertise/articles/how-racing-rating-rules-work-and-how-to-maximize
PHRF is a simple handicap system, similar to the system used in golf. Considering the type of yacht, an assumed sail plan, and the team’s performance, a corrected-time handicap factor is assigned to the team. Races under PHRF rules correct times using TOD or TOT. The other three rating rules are a bit more complicated.
Rating rules shaped our boats - Good Old Boat
https://goodoldboat.com/rating-rules-shaped-our-boats/
Sail area was not included, of course, nor were any credits given for less efficient rigs so, naturally, in the yacht-racing field the cutters predominated. Eventually, this rule was modified in 1854 as the Thames Measurement Rule: Tons = ( (L-B) x B x .5B)/94. (L = length stempost to sternpost and B = maximum beam.)
ORR - US Sailing
https://www.ussailing.org/competition/offshore/orr/
A complete measurement must be provided by a US Sailing Official Yacht Measurer. This is the most accurate rating the rule system offers. High profile ocean races, such as the Newport-Bermuda Race, often require fully measured certificates. To request official measurement, please contact the US Sailing Offshore office. Partially Measured
ORC - US Sailing
https://www.ussailing.org/competition/offshore/orc/
ORCi is based on a complete boat measurement carried out by a US Sailing Official Yacht Measurer as defined by the Universal Measurement System. The hull and appendages must be measured and the offset file approved by ORC to meet ORCi standards. This is the most accurate rating the rule system offers.
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