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90 £ e = x yF5 8 : 2 wr S Ss Revs.Per. Min. (Propeller) Fic. 7--RESULTS FROM. VOYAGE. The high-pressure turbine is 3 ft. maximum diameter by 13 ft. over all length, and the low-pressure 3 ft: 10 in. diameter by 12 ft. 6 in. length. The turbines are similar in design to a land turbine, being balanced for steam thrust only. the propeller thrust being taken up by the ordinary thrust-block of the horse-shoe type, which is fitted aft of the gear wheel. A new con- denser; together with a vacuum aug: mentor, is fitted with the-turbine in- stallation. The cooling surface of the eondetiser is 1,165.sq. it. The gear wheel is of cast iron, with r 320 6 s> a os -- 2 S15 £ * = Wy .30 50 Revs. Per.Min (Pr ope ler) BiG 2.9: 55 60 65 two forged steel rims shrunk on. The diameter of the wheel is 8 tt, 314 in; pitch circle, having 398 teeth--double 54 56 'chrome nickel Fic. 12--Lonerrup na SECTION THRouGH ENGINE. I THE MarRINE REVIEW Revs. Per Min.Propeller) Fic. 8--CoMPARATIVE WATER CON- SUMPTION, helical--with a circular pitch of 0.7854 in. The total width of face of wheel is 24 in.; inclination of teeth 20 deg. April, 19}¢ on board, of the turbine-gearing jp stallation at the end of February of this year, the vessel was loaded to the same draught and displacement as that under which the trials referred to jp the Appendix were run. As already mentioned, the propeller has not been touched or altered in any way. Ip the short interval since the completion of her alterations, the vessel has been out to sea on four occasions. The following table gives the data and results of a run made off the Tyne on March 11th, 1910, at varying reyo- lutions:-- The water consumptions per hour at the several rates of revolutions have been plotted on Diagram 8, shown in full lines for the reciprocating engines and in dotted lines for the turbine geared engines. It will be noted that under normal full speed steaming con- RESULTS "ON. VOYAGE TO MALTA. Speed) inv knots: ke 8.4 9.56 10.5 10.66 Revolutions. per? minute: 00) 4 56.5 65.0 71.3 73.3 Botlers: pressure (3.0.6 145 144 140 145 Initial pressure H. P. turbine.......... 60 lbs 86 Ibs. 110 Ibs. 121 Ibs, tnttal. pressure <b. Pl. turbines a. ens. 15.2 in 12.5 in. 7.1 in. 3:5 te Wael ey ee er 28.8 in 28.8 in. 28.7 in. 28.5 in. Barometer e236 cies oe i 29.9 in Mets bane See Shatt: horsepower 3.705 2. r eos he 456 740 980 1,095 Water consumption per hour, main engines. 9.070 Ibs. 12,000 Ibs. 14,480 lbs. 15,670 Ibs. Water consumption, all purposes........ 9.670 lbs. 12,620 Ibs. 15,120 Ibs. 16,370 lbs. Water consumption per shaft horse- POWEL, main engines; 7.00. 6 ee, 19.8 lbs. 16.2 lbs. 14.8 lbs. 14.3 Ibs. to the axis. The pinion shafts are of steel, 5 in. diameter pitch circle, with 20 teeth 0.7854 cir- N 0 8.5 9.0 Speed in Knots Fie. 10. os cular pitch. ton: On the completion of the erection, The ratio of gear is 19.9 60 62 64 66 68 800M. TURBINE MACHINERY. ditions an increase of about one knot is obtained with the same coal con -- sumption. Fig. 14 shows the water o a ws 3 - 8 = Horsepower ~ o oe 60 70 Revs. Per. Min. Prope ster) Pie. 11: consumption per shaft horsepower for the geared turbines. It will be noted that the observed mean speeds on the I 70 72 76