Sec. 72.6 



DESIGN FOR CONFINED WATERS 



G63 



Bx' 37.6 ft Hx-8.l4n 

 </Hx -4.619 



Rise of Floor/Bx - 0.0246 ■ Bilqe Podlus/Bx" 0.232, obout 



Fig. 72. a Body Plan of Detroit River Steamer 

 Tashmoo 



Along the greater part of the ship length, there is 

 still adequate room to pass the displaced water 

 underneath the bottom. This was done in the 

 design of the Hudson River paddlewheei steamer 

 Mary Powell, with a rather flat floor [Int. Mar. 

 Eng'g., May 1920, pp. 406-407], and in the 

 design of the large Lake Erie paddlewheei steamer 

 Greater Detroit, to be described presently. 



72.6 Typical Shallow-Water Vessels. It is 

 helpful here to examine the forms and other data 

 or some fast shallow-water vessels with slender 

 hulls, — vessels which have given many decades of 

 splendid and even superior performance. The fact 

 that some of these craft were designed and built 

 nearly a century ago is supplemented by the 

 amazing realization that their performance is 

 still good by the standards of today (1955). 

 Many of them, therefore, appear to be perfectly 

 valid bases for a modern, systematic analysis of 

 design for a fast, shallow-water vessel. 



Among these vessels are mentioned: 



(a) The famous Hudson River steamer Mary 

 Powell, designed and built in 1861, when naval 

 architecture in the United States was only 

 emerging from the practical stage. The designed 

 waterline of the run of this vessel is illustrated in 

 diagram B of Fig. 24. G. The complete lines are 

 to be found in "International Marine Engi- 

 neering" for May 1920, pages 406 and 407; see 

 also a paper by B. F. Isherwood in the Journal 



of The Franklin Institute, July 1879, Vol. 78, 

 pages 18-27. A model of this vessel, EMB 530, 

 was made and tested at the old Experimental 

 Model Basin at Washington. The results were 

 reported upon most favorably by D. W. Taylor. 



(b) Detroit River excursion steamer Tashmoo, 

 the body plan of which is reproduced in Fig. 72.A 

 [SNAME, 1901, pp. 1-12; PI. 3 contains the 

 complete lines of both the Tashmoo and the 

 City of Erie; also SNAME, HT, 1943, pp. 383-386] 



(c) The Lake Erie steamer City of Erie, the 

 body plan of which is given in Fig. 72. B. It was, 

 like the Tashmoo, designed by Frank E. Kirby, 

 who specialized in lake and river steamers. Its 

 famous race with that vessel in 1901, in the 

 relatively shallow waters of Lake Erie, is still 

 remembered [SNAME, 1901, pp. 1-12]. 



(d) Hudson River steamer New York, the body 

 plan of which is reproduced in Fig. 72. C [SNAME, 



Bili5ef?adius/Bx= 0.121 



Rise of Floor/ Bx'0. 0224 ! 



Fig. 72. B Body Plan of Lake Erie Steamer 

 City of Erie 



1906, pp. 31-40 and Pis. 14 and 15]. A model of 

 this vessel, EMB 529, was made and tested at 

 the old Experimental Model Basin at Washington. 

 This and the two vessels preceding are listed in 

 the table of E. M. Bragg [SNAME, 1916, PL 90]. 



(e) Hudson River steamer Hendrik Hudson, de- 

 signed by J. W. Millard and Brothers, New York 

 [Mason, C. J., MESA, Feb 1930, pp. 100, 104] 



(f) Lake Erie steamer Greater Detroit (sister 

 vessel Greater Buffalo), designed by Frank E. 



Afterbody 



/Mom Hull Extends Above This Lin. 



Fore body 



Frome Numbers 



Frame Number 



Fig. 72. C Body Plan of Hudson River Steamer New York 



