ELECTRIC PROPULSION OF SHIPS. 

 Table II, Group II — Particulars of Machinery 



127 



Main Engines. 



Main Boilen — No 



Type 



Steam press., lbs., B. & W. 

 Steam press., lbs., Scotch . . 



Donkey' Boiler — No. and type. . . . 



Type of auxiliaries 



R. P. M. — propeller 



S. H. P 



M. E. P.— based on I.H.P 



S. H.P. 



Radio \ 



I. H. P. 



Oil perS. H.P. per hr., lbs.. 



Weight and space: 



{A) 

 Diesel 

 electric 



S-600 B. H. P 



Engs. 



5-410 K.W., 



250 v., 



2S0R.P.M.g:ens. 



1-2600 H. P. 



D. C. Motor 



1 Scotch 

 Electric 



90 

 2600 



.65 

 .55 



Direct 

 Diesel 



2-1300 B. H. 

 6 cyl. 

 4 cycle 



1 Scotch 

 Electric 



115 

 2600 



90.5 



.72 



.50 



626 

 540 

 638 

 550 



86' 9" 

 163 



(C) 

 Geared 

 turbines 



[-H.P.&1-L.P. 

 turbine driving 

 single red. gear 



B. &W. or S. 

 250 

 220 



1 Vert. 

 Steam 



90 

 2600 



.95 



373 (A) 

 461 (/) 

 321 (A) 

 397 {s) 

 397 {b) 

 528 (j) 

 343 {b) 

 455 (j) 



85' 3" {b) 



82' 9" (j) 



1.00 (A) 



.97 (i) 



S. S. quad. 



1-2600 S. H. P. 



B. &W. OrS. 

 250 

 220 



1 Vert. 

 Steam 



70 

 2600 

 25.5 ref. L.P. 



.92 

 1.00 



497 {b) 

 585 (/) 

 428 (A) 

 504 {s) 

 521 (A) 

 653 (^s)- 

 450 {b) 

 563 {s) 



85' 3" (A) 

 82' 9" (j) 



1.09 {b) 



1.10 {s) 



S. S. turbo- 

 electric 



1-Gen. 3000 R. 



P. M., 2300 V. 



1 induction 



motor 



B. &VV^. orS. 



250 at 150° F. 



S(</) 

 220 at 150° F. 



S(^ 



1 Vert. 

 Electric 



100 

 2600 



.90 



387 (A) 

 475 {s) 

 333 {b) 



409 (j) 



410 (A) 

 539 (/) 

 354 (A) 

 465 (/) 



85' 3" {b) 



82' 9" (j) 



1.23 (A) 



1.21 (.) 



{d) Service conditions — superheaters designed for 200° F. 

 {b) With Babcock and Wilcox boilers. 

 (j) With single end Scotch boilers. 



The principal points of total propelling machinery weights, which include auxiliaries, 

 piping, engine and fire room floor plates, ladders and gratings, water, etc., weight per 

 S. H. P., relative costs, fore and aft, space required for the machinery installations, fuel con- 

 sumptions, etc., are plotted as indicated in Fig. 7, Plate 22. 



These data, it will be seen, vary somewhat frorti those of Mr. Thau, particularly in 

 regard to weight and costs for Diesel electric machinery. Table III, compiled from Tables 

 I and II, indicates that the comparison of wet weights, costs, fuel per day and space re- 

 quired, based on the geared turbines with watertube boilers, all as outlined under groups 

 I and II, are as follows: 



