COMPARATIVE RESULTS IN STEAM AND COAL CONSUMPTION 

 WITH TURBINES, RECIPROCATING ENGINES AND A COM- 

 BINATION OF THE TWO ON THE STEAM YACHT VANADIS. 



By Clinton H. Crane, Esq., Member. 



[Read at the eighteenth general meeting of the Society of Naval Architects and Marine Engineers, held in 



New York, November 17 and 18, 1910.] 



The steam yacht Vanadis, whose particulars are — 



Length over all 279' o" 



Length, load water-line 232' 8" 



Beam 32' 6" 



Depth (Moulded) 19' 7i" 



Trial displacement 1,450 tons 



was built on the Clyde at the yard of Messrs. A. Sa J. Inglis, from the designs 

 of the writer, and delivered by them in the spring of 1908. 



The propelling machinery consisted of the usual arrangement of Parsons 

 turbines with a high pressure center and two low pressures driving the wing 

 screws. 



The guaranteed speed of the vessel was 15^ knots maximum, with a 

 cruising speed of 13 knots, which was to be obtained on a guaranteed 

 consumption of 26 tons of coal per 24 hours. 



At the time the vessel was designed several turbine yachts had been 

 constructed, no one of which had shown economy in coal consumption, so 

 that very special stress was laid on this question of economy at cruising 

 speed. As a consequence the turbines were designed primarily with this 

 end in view. 



Particulars of blading as follows : — 



