Understanding the Offshore Racing Rule (ORR): Key Measurements and Applications

Feb 06, 2026

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This document provides insights from Lou Sandoval, a dedicated member of the CYC and former ORR measurer, discussing the nuances of the Offshore Racing Rule (ORR) as the Chairman of the Race to Mackinac from 2012-2013. The ORR emphasizes a measurement-based subjective approach that considers observed performance. Important parameters discussed include displacement, hull shape, center of gravity, sail area, and righting moment. We highlight the time-on-time rating system and its implications on elapsed time and performance differentials among boats during races.

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Understanding the Offshore Racing Rule (ORR): Key Measurements and Applications

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Presentation Transcript

Race Committee Training ORR Measurement Rule
Lou Sandoval CYC LMPHRF Delegate 2001-2007 ORR Measurer (trained 2003) Race to Mackinac Chairman 2012-2013
Why the Offshore Racing Rule (ORR)? ORR LMPHRF Subjective Based on ‘observed performance’ Quasi-quant analysis • Objective • Measurement based • Sum of the parts
What parameters? • Displacement • Hull shape • Center of Gravity (cG) • MWG of largest sail • Sail Area • Righting moment
CYC Applications • Time on Time rating system • Elapsed Time (Secs/mi) • Percent of time sailed • Time differential is based on the time boats are on the water.