. Marine Engineer . our ot screw;teamers when reversing the engines, and it was demonstrated in their report that full speed astern may oftenbring about a collision, whereas by steaming ahead and usingthe rudder, it might he avoided As an instance, the turbine steamer Viking, 350 ft. , and with a displacement of some 2500 tons, when steaming ahead ? Knots was found t have a turning circle [475 ft in ibout 42 lengl Such a ship would require about 2$ lengths to stop in when reversing the engines and maintaining the course. It is therefore evident that the ihip 1 ild I- turned through 90 l>
. Marine Engineer . our ot screw;teamers when reversing the engines, and it was demonstrated in their report that full speed astern may oftenbring about a collision, whereas by steaming ahead and usingthe rudder, it might he avoided As an instance, the turbine steamer Viking, 350 ft. , and with a displacement of some 2500 tons, when steaming ahead ? Knots was found t have a turning circle [475 ft in ibout 42 lengl Such a ship would require about 2$ lengths to stop in when reversing the engines and maintaining the course. It is therefore evident that the ihip 1 ild I- turned through 90 l>v combined use of rudder and engines in much ie - di itance than 2 5 lengths The following figures maj also be 1 wnpared. I • Read at tl 1 :x International Congress and Summer Meetings ol the Forty-eighth Session of the Institution ofNaval Architects. June 25. 1907. September i, 1907. THE MARINE ENGINEER AND NAVAL ARCHITECT. 59 I omfarisom of Turning Circles and Distance Requiredto Stop from High •The figures for the Liibeck are given on authority of the Marine Rundschau,December, 1906. fThis trial was made from full speed ahead. Data as to combined use of helm and engines show evensuperior results. For instance, the Calais and Dover steamersturn completely round, and change from steerage headway 10steerage stern-way in under two minutes. Reversing turbines have been fitted from time to time of suchpower as the conditions of service demanded- In recentturbine installations the revolutions astern attained at themoment of stopping the headway have been from 65 per cent,to 80 per cent, of full ahead revolutions in the case of ordinarythree-shaft turbine steamers Installations with four shaftshave had astern turbines fitted to all shafts, the arrangementconsisting of two turbines in series on each side of the number of such installations is still too small to enable usto make reliable comparisons as to results. The question of speed under stern-way may be ve
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