Sec. 51.10 



TYPICAL SHIP-FORM AND SHAPE DATA 



237 



atlantic passenger vessel. He reported upon these 

 studies in the paper "Design of American Super- 

 hners" [SNAME, 1931, pp. 303-350 and Pis. 1-13]. 

 Table 1 on page 318 of this reference gives the 

 ship dimensions and hull coefficients correspond- 

 ing to three of the fourteen models tested at the 

 Experimental Model Basin, Washington. All 

 these designs embodied 4 propellers. This paper 

 was published, practically in full, in Marine 

 Engineering and Shipping Age, December 1931 

 and January through April 1932. 



E. P. Trask discussed this design problem 

 further in his paper "A Proposed 800-ft Atlantic 

 Liner" [MESA, Jul 1932, pp. 268-275]. This 

 vessel was designed for an operating speed of 

 28.5 kt. 



At the conclusion of World War II, J. L. Bates 

 and I. J. Wanless made an analysis of existing 

 passenger liners and worked up a new design, 

 which they reported upon in their paper "Aspects 

 of Large Passenger Liner Design" [SNAME, 1946, 

 pp. 317-373]. This paper tabulates many dimen- 

 sions and characteristics of the Europa, Man- 

 hattan, Conte di Savoia, Rex, Normandie, and a 

 projected U. S. Maritime Commission design 

 P3-S2-DA1 for trans-ocean service. One of the 

 ships analyzed, the Manhattan, is a twin-screw 

 vessel but all the others are quadruple-screw 

 ships. 



Corresponding information on triple-screw ves- 

 sels, with sterns which are the most difficult of 

 any to design, is very scarce. This is partial 



justification for referring to a paper, now almost 

 historic, by G. W. Melville entitled "Notes on 

 the Machinery of the New Vessels of the United 

 States Navy" [SNAME, 1893, pp. 140-175]. 

 Plate 41 of this paper illustrates the triple-screw 

 arrangement of the U.S.S. Columbia (old) of 1890. 



Fig. 51. F is a body plan resembling those of the 

 coastwise triple-screw passenger steamers Yale 

 and Harvard, designed in the early 1900's, and 

 reported upon by C. H. Peabody, W. S. Leland, 

 and H. A. Everett in a paper "Service Test of 

 the Steamship Harvard" [SNAME, 1908, pp. 

 167-186]. These vessels gave long and distin- 

 guished service on many difficult routes, so much 

 so that their designs would warrant further 

 analysis if accurate and reliable data and drawings 

 could be found. 



Fig. 51. G is a body plan of the high-speed, 

 triple-screw passenger and cargo vessel Great 

 Northern (and sister vessel Northern Pacific), 

 designed in about 1914 and famous for outstanding 

 performance in heavy weather. Unfortunately, 

 it is not possible to add propeller-disc positions 

 and appendage data to either of these drawings. 



German naval architects have probably had 

 more experience than all others combined in the 

 design of triple-screw vessels. However, as almost 

 all of these were combatant craft, their lines and 

 the design rules pertaining to them appear not 

 to have been published. What might be considered 

 an exception to this is the study for a medium-size 

 fast liner published by E. Foerster [SNAME, 



Fig. 51.F Body Plan Resembling Those of the Triple-Screw Coastal Passenger Vessels Yale and Harvard 



