764 



HYDRODYNAMICS IN SHIP DESIGN 



Sec. 76.7 



Fig. 76.C Body Plan of World War II Concrete- 

 Hull Steamer, U. S. Maritime CoiMmission 

 Design Cl-S-Dl 



water body. Indeed, the use of straight sides, 

 either plumb or sloping slightly, is standard on 

 many ships in which straight elements are not 

 otherwise employed. 



The elements of greatest practical benefit are 

 the straight and level sheer line, utilizing a section 

 of constant depth, and the straight or ridge-type 

 deck-beam lines described in Chap. 68. 



Examples of straight-element ship forms which 

 have been designed and constructed in the past 

 are described and illustrated in the following: 



(1) U.S. Navy landing craft LCI (L). The original body 



plan is shown by E. A. Wright, SNAME, 1946, 

 Fig. 14, p. 384. 



(2) World War II concrete steamer, U.S. Maritime Com- 



mission, Cl-S-Dl design, TMB model 3745M. A 



TABLE 76.e — Hull-Form Parameters and Propor- 

 tions FOR World War II Concrete Steamer 



This craft, of the U. S. Maritime Commission Cl-S-Dl 

 design, had transverse sections made up of straight lines 

 joined by short arcs. 



body plan of this ship is reproduced, by courtesy of 

 the U.S. Maritime Administration, in Fig. 76.C. 

 Table 76.e gives the dimensions and form data for 

 this design. 



(3) World War I patrol boat, Eagle class, SNAME RD 



sheet 118 



(4) Ferryboat John J. Walsh, 1938; HT, SNAME, 1943, 



p. 174 



(5) Ferryboat Coquivacoa, 1938; SNAME, HT, 1943, p. 



179. This vessel has a flat bottom and straight-V 

 sections. 



(6) Detroit Diesel Engine Division, GMC Report MID 



2-21 on 47.5-ft Double-Chine Work Boat, no date 

 but about 1947. See SNAME RD sheets 102 and 104. 



(7) Motor canal boats with flat bottoms and straight 



segments of section lines, SBSR, 17 Jan 1935, p. 64 



(8) Small, light-displacement sailing yacht, with single 



chines and transom stern. Yachting, May 1950, 

 p. 60 



(9) Small Thames tugs with chamfered chine and hull 



surfaces that are presumably developable, SBSR, 

 3 Jun 1954, p. 703. 



76.7 Partial Bibliography on Straight-Element 

 Ship Designs. A list of the principal references 

 on this subject, but by no means a complete list, 

 is given here for the benefit of a ship designer 

 working up a straight-element form: 



(1) Taylor, D. W., "Some Experiments with Models 



Having Radical Variations of After Sections," 

 SNAME, 1914, p. 61ff 



(2) McEntee, W., "Cargo Ship Lines of Simple Form," 



SNAME, 1917, pp. 101-107 and Pis. 20-26; 

 also Int. Mar. Eng'g., Jan 1918, p. 19 



(3) McAleer, J. A., "Straight Lined and Fabricated 



Sliips," Int. Mar. Eng'g., Apr 1918, p. 234 



(4) Bion, C. W., "A System for the Design of Ships with 



Straight-Lined Sections," Int. Mar. Eng'g., Jun 

 1918, pp. 335-338 



(5) Sadler, H. C, and Yamamoto, T., "Experiments on 



SimpUfied Ship Forms," SNAME, 1918, p. 157 



(6) Baker, G. S., and Kent, J. L., lESS, 1918-1919, 



Vol. LXII, p. 216 



(7) "A Cubist Ship (S. S. Newton)," Mar. Eng'g., Feb 



1921, pp. 119-120. The stern of this vessel termi- 

 nates in a rather narrow square transom of tri- 

 angular section, with its apex at the bottom. 



(8) Thomas, J. B., "The Powering of Ships," London, 



1921, pp. 276, 278, 287 



(9) Wrobbel, J. F. K., "Model Experiments on Rhine 



Ships," SBSR, 3 Apr 1924, pp. 398-400 



(10) Robb, A. M., "Straight-Frame Ships," lESS, 1924- 



1925, Vol. LXVIII, p. 313 



(11) Hay, M. F., "The Maierform of Hull Construction," 



INA, 1931, pp. 30-51 



(12) Baker, G. S., "Ship Design, Resistance and Screw 



Propulsion," 1933, Vol. I, pp. 85-87, 115-118. 

 There are illustrated here the lines of a standard 

 "N" type ship of World War I. 



(13) Edward, J., and Todd, F. H., "Steam Drifters: Tank 



and Sea Tests," lESS, 1938-1939, Vol. LXXXII, 

 pp. 51-107 



