Here are some of measurements taken to determine CCA. 

 rating: L.O.A. = length from aftermost part of hull to inter- 

 section of forward side of stem and top of covering board; 

 O.H.F.= overhang length of stem from plane of flotation to 

 forward L.O.A. point; 0. H. A. = overhang length at stern; L.W.L.= 

 load waterline length, which is L.O.A.-O.H.F. and O.HA; 4% 

 W.L.= length measured at point 4% of LW.L above the plane 

 of flotation; Mes. Bm.=average of beams at LW.L and the 4% 

 W.L taken at fore and aft position of maximum beam of the 

 LW.L.; Mes. F. = average of freeboard measured port and 

 starboard to top of covering board abreast bow and stern 

 endings of LW.L plus half the average rail height at those 

 points; B= length of foot of mainsail; P= length of hoist of a 

 jib-headed mainsail; Bj=actual fore triangle base, spinnaker 

 pole length, or a percentage of spinnaker measured width, 

 whichever is greatest; P2=actual fore triangle height, or height 

 determined by spinnaker dimensions, whichever is the greater. 



MES F r^ 



ance system, the scale is based on the rating and distance sailed which 

 gives a fixed time allowance regardless of the elapsed time of the race— 

 a time which will vary under different sailing conditions. 



While there are other simpler rules in current use which provide fairly 

 accurate comparative ratings, most racing-cruising boats in American 

 waters are currently designed to the Cruising Club of America (CCA.) 

 Measurement Rule. 



In the comparing of the relative potential speeds of different-sized 



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