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It was shown that in vessels whose lengths were twice,the square of the speed, residuary resistance is constant for a variation of form, represented by a range of prismatic coeffic'ent of 20 per cent.. In other words, surface being constant, between the limits of KNOTS 'The Engineer' DISPLACEMENT OF SHIP "Tut ENGineer® Fig. 4 REVOLUTIONS 200 'so 100 kad EFFECTIVE HORSE POWER TAE MARINE. REVIEW '50 per cent and 70 per cent prismatic coefficient, variation of form permits of equal speeds being secured with equal powers. Form, in these cases apparently, has no influence on the results. Curves 5; .6, 7. and. & Fig. 2, are. dor 68 _B BLOCK 668 o CO-EFF 64 pe 62 a vom 510 193 275 312 360 gasses er Fs SR tas EFFECTIVE HORSE POWER. eo n 54 30,000 nN eo @ 24 KNOTS f Fig. 2 E.H.P. FOR SKIN AND WAVE MAKING RESISTANCE HORSE POWER EFFECTIVE 27 vessels of the characteristics indicated. They show: the effect of disposing d's- placement breadthwise. Vessel 6 was the basis vessel, the ratio of depth to length in vessels 2, 4 and 5 being the same as vessel 6, the breadth depth ratio varying, and length con- -- 8 BLOCK Oo COEFF 360 510 510 610 an ny POwcR wo ow eo & vyE HORSE 8 » oe €FcecT KNOTS Swain Sc. Fig. 3 KORSE POWER Qrrective DIBPLACEMERT OF SHIP. Fig. 5 E.H.P. FOR GIVEN SPEEDS AND DISPLACEMENTS REVOLUTIONS. © 000 - 200 30 100 Lo 7000 © Jf cove | \L / aie | | | > \ 5000 lo erate | t vr BASE FOR SPEEO \ 4009 = S = o 4000 5 Di ef 7 | = 2 mG 2 ° A 3000 y 3000 CURVE SHOWING INCREASE IM EFFICIENCY BUT » ae '\ LZ v é INCREASE IM DIAMETER OF & PROPELLER TO ° S 744000 85. THRUST ATA SPEED OF 0 . e 1S KNOTS. 8 See \ 2000 Pn oad 2000 3 as -- ; = LA : ti ee ¥ teen bed ee 1000 _ oe B 2 SCALE FOR DIAMETER FEET, 19 " 12 > * 1S 16 M7, e 9 x Ow 12 2 * 1s 16 7 16 9 e sPeeos ' SPEEDS ea i BASE FOR POWER oe. PASE OR POWER __ a - es So endian. | "The Engineer Swarts Sc PROPELLER EFFECTS Fig. 7 Fig. 8-IODEAL EFFICIENCY © Fig. 6