To find the area of Head Sail, for pole Mast, multiply I by J and divide by two.
Lug Sails with Head Sails.—In the case of a lug sail, standing lug sail, or balance lug sail being carried, the actual area of the same shall be computed; and if head sail be also carried, the measurements for computing the area of the same shall be taken from foreside of mast, etc., in accordance with the method provided in the rule for head sails.
Yawl Sails.—The area of a schooner’s sail or a yawl’s sail would be similarly found; in the case of a yawl having a lug mizzen, the lacing-holes in the yard would be taken as the upper boundaries.
Time Allowance (Rule 4).—Time shall be allowed on arrival for differences in rating, according to the annexed scales, increased or decreased in proportion to the length of different courses. In all time, where time has to be allowed for difference of rating in yachts of 10 rating and under, it shall be computed by the rating and fractions of the rating in accordance with the time scales.
The explanation of the calculations on which the time allowances are based will be found in the little volume of the Y.R.A. rules, annually published by Messrs. Harrison, of St. Martin’s Lane, London, in which also will be found a scale of allowances for differences of rating worked out in fractions of tenths for vessels of from ·1 to 571 rating.
It will suffice to say here, that if a vessel’s rating is x, t, the allowance she makes per knot to a yacht whose rating is 1, will be thus found:
| t = 360 | 360 |
| 5√x. |
The result is the allowance in seconds. As the allowance is calculated for one knot, the allowance for another distance will be found by multiplying t by the length of the course in knots. To calculate the allowance that should be made by one yacht to another, find the t, as above, for both yachts. Subtract the lesser from the greater t. The result will be the time in seconds to be allowed per knot by the yacht rating highest.
Allowance to Schooners and Yawls.—The Yacht Racing Association recommend for the consideration of sailing committees: (1) That as mixed races are no satisfactory test of the relative speed of yachts, the different rigs should, whenever practicable, be kept separate; but when mixed races are unavoidable, the following rule shall be observed:—
The rating of schooners and yawls to be reckoned for time allowance as follows, viz. schooners at three-fifths, and yawls at four-fifths of their actual rating; provided that in case of a yawl, her mainsail does not exceed ·37 of her total sail area, and that her mizzen is not less than ·06 of her total sail area. In the case of a pole-masted yawl, her mainsail shall not exceed ·46 of her total sail area, and her mizzen shall not be less than ·75 of her total sail area. In schooners, the foreside of the mainmast shall, at the deck, be not further forward than the middle of length of the load water-line.