Handicap and Distance Racing 73 



The C. C. A. Rating Formula is as follows— 

 Rated Length (R)rr.93 (L±Bm±Dra.±Displ.±S±F-I)xBal. RxProp. 



This (R) is used at "Rating" in the time-allowance table to deter- 

 mine the seconds per mile or "Allowance." 



To find the allowance a yacht of any given rating should receive from 

 a larger one, take the figure to be found opposite the smaller rating; from 

 this subtract the figure opposite the measurement of the larger yacht; 

 and the difference, multiplied by the number of nautical miles in the 

 course, is the amount of time allowance due the smaller vessel, in seconds 

 and hundredths of a second. Example: 



Boat A-Rating 36.7 



Boat B-Rating 42.3 



Course length 675 nautical miles 



Boat A allowance from table 



(for 36.7)= 180. 19 seconds per mile 

 Boat B allowance from table 



(for 42.3)=155.74 seconds per mile 

 Boat B allows Boat A (subtract B 



allowance from A allowance) 



24.45 seconds per mile 

 In the race (675 nautical miles) 



B allows A 675x24.45 seconds or 4 hours, 35 minutes, 4 seconds. 



The table is based upon the assumption that, under average racing 



conditions, a yacht of rating measurement, R, will sail one nautical mile 



in the number of seconds given by the formula. 



2160 



___ +183.64 



The allowance per mile between yachts of different ratings will, there- 

 fore, be given by 



2160 2160 



Vr VR 



in which R is the rating measurement of the larger yacht and r that of 

 the smaller yacht. 



