Bisbee daily review., 1920-07-07
WILL MEASURE SHAMROCK AND
 CUP DEFENDER
Careful Calculation Needed To Determine Handicap for
 American Boat
(Amoeiated Prcss kcqscf iVire)

morrow by the cup defender, Reso- iute.
 The two yachts will be officially | measured tomorrow and will receive final overhauling for the internat- ional races which begin July 15. Ex- | perts estimate that the defender will receive time allowance handicap of | 61s minutes.
 In computing the allowance, the | waterline of the yachts is measured while they have their ful racing rigs and entire crews aboard. The water line is supposed to be 75 feet. Then then drydock is pumped out and the draft, quarter beam lengths, sail area and other measurements taken.
 Just prior to the starting of the first race for the Americas cup this month l off Sandy Hook, Shamrock ". the challenger and the American defender of the historic trophy will be lowed to a South Brooklyn shipyard for official measurement This is a very impor- tant feature of the big contest and one that is going to create considerable trouble Upon the outcome of the measurement, will depend the time al llowance that will exist between the es'aft No one konws what this allow iance is going to be, although all who are familiar with the situation state, that the challenger will have to give time to the defender.
 iS n ha Ol f. ficult task to measure the cups yachts. For the first time, the big race will be sailed under the Univer- sal rule of measurement. The rule reads as follows:
 Yachts shall be rated for classifi cation and time allowance according
 to the following formula: IS percent of the product of length, multiplied
 by the square root of sail area, divided
 by cube root of displacement"
 This is an exceptionally complicated rule and one that only yacht designers l understand. For the past 30 years il :. all of Americas cup racs the masure
 ment of d boat for time allowance has
 been one-half of the sum of the loaC ' water line length and the square roo N of sail area.
 In 1903 and previous years Messrs Mower and Hyslop simpled measured N the deck length of boat, dropped plumb bob from each end into tn, water, floated batten in under, tn,
 bow and under the stern, measured ol o the batten the distance from tn
 plumb line to the end of the water ; line, forward and aft, and substracte u the su moi these two measurement
 from the deck length. That gay u them the toad water-line length Tn
 sail area was measured according {
 arbitrary methods. but it was assume
 to be and very nearly was the mea.
 urement of the area of the sails. T '' determine the square root of this are was simple matter and one sum i ' addition and one in division dete mined the rating of the boat
 This was the formula even in 19O
 although the measurements of boat
 for other races of the New Yor
 Yacht club of that year were mad S under d rule very similar to the or
 now in force, but this rule havin
 been adopted early in 1903 and ti h. challenge for the cup races of 19( d having been accepted in the fall
 1902. the old rule of measurement prevailed in the last cup race. iu This year, however, the measurir e of the yachts will be more compI cated involving a lot of calculatio
 The load-water line will be measure a' as heretofore and then the quarte beam length will D ascertained. Tn
 dimension is used as d corrective '' the lOad-water line and it must m "A without penalty be more than ce 'u tain percentage of the load-water lin IT For boat of 75 feet water line, tl .l' dimension fixed by the challenge T. this percentage will be slightly ov 'c' 91 per cent. Should it exceed tn 'E percentage one-half of the excess W ''' be added to the load-water line leng ILL in order to constitute the length ia
 tor in the calculation for rating.
 In addition there will be vario,
 tests to ascertain whether the bull
 CTS have made any concave curves notches in the lines of the hull for O so certain penalties are provided.
 While quite different from that or years ago the method of measurii ". the sail area is really method av ascertaining practically the area
 ,h .o,l D,,i ut the length factor and the sail arc ". factor may of course be taken whi W. the boat is in the water. The real ce new feature of the measurements of the cup yachts. however, will be II m. measurements taken to determine q tn spacing. The rule governing tn CT reads.