242 HEAVY-OIL ENGINES FOR MARINE PROPULSION. 
It so happens that a certain type of two-cycle internal combustion 
engine has already been designed, and is now building for a foreign naval 
power. Complete plans and data for this are available, and it happens to 
fit so well into the type of destroyer in question that this actual engine has 
been selected in preferance to a theoretical engine designed for the particular 
purpose. It is possible that a specially designed engine might prove of less 
first cost, and effect a greater saving of weight and space. But since we 
are dealing with an actual vessel it is preferred to take an actual engine. 
Even so the results obtained are sufficiently startling. 
The engine which has been selected is of the Nuremburg type. It is 
of eight cylinders, single-acting and two-cycle. The general dimensions of 
the engine are as follows: 
Wiameter ol cylinders... 45.0584 he ee ae 18.9 in. 
SUE CO) CS) NA Ree RTP DEN IAE So. 6.5 "C10 ci be oc 19.7 in. 
IRevolutionsipenr minute... 5.) 2.032. anes 350 
iEmalke MOrse=pOWeL i, 21.5 Pauls eee ene eee ae 2,500 
Wengthvoverall..:. 22)... aS) eee eee Syl INE. 
TEACH Beach sa. a tes 2S Be ee Bin ake 
UCTS bes SRR is Sih. asl antiane geo dled SAO TON p ke 
Weishtcompletes. ichigo Sa eee beeen 47 tons 
The eight cylinders give perfect balance and an evenness of turning 
moment not surpassed by the steam engines. 
Three of these engines will be used. They will be reeeated as shown 
on Plate 127. The present steam installation of the Paul Jones is shown 
on Plate 126. The unassigned space shown on the plans represents only a 
part of the space saved. ‘The rest of the space saved is in the engine rooms 
and fuel storage. 
Three of these engines will have a shaft horse-power of 7,500 which is 
somewhat in excess of the shaft horse-power of the present steam engines 
rated at 8,000 indicated horse-power. 
For such a high-powered vessel, which would be expected to cruise 
long distances at an economical speed there are reasons which would make 
the selection of three engines preferable to two larger ones. By uncoupling 
the two-wing propellers the middle engine could be used for cruising purposes 
and even then, running at half power with a very economic fuel consumption, 
would give a cruising speed of 16 knots per hour. In this connection the 
propeller question has been carefully looked into and shows that the pro- 
posed plan is thoroughly possible with but a slight loss of propulsive 
