eee eT Oe Set ee 
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THE RESISTANCE OF VARIOUS TYPES OF BARGES IN SHALLOW 
AND DEEP WATER. 
By Proressor HeRBerT C. SADLER, MEMBER oF CoUNCIL. 
[Read at the twenty-fourth general meeting of the Society of Naval Architects and Marine Engineers, held in 
New York, November 16 and 17, 1916.] 
The subject matter of this paper represents a digest of the results of a number 
of experiments on various types of barges, originally undertaken for the “Board 
on Experimental Towboats,’* U.S. Army. A full report in somewhat different 
form was published as Document No. 857, House of Representatives, 63d Con- 
gress, 2d Session. 
Unfortunately the above report is now out of print, so it was thought advisable 
to place the results of the above experiments in some permanent form in the vol- 
umes of our Transactions. 
In the original report, the results were worked up for a particular size of 
vessel (150 feet long). In order to make them more readily applicable to any 
size, the curves have been re-plotted in terms of residuary resistance per ton of 
displacement on a speed-length ratio base (V in knots; L, length over all, in feet; 
Rw in pounds; displacement in long tons). 
The wetted surface, and hence frictional resistance, in the different types 
varies somewhat, but may easily be calculated for any specific size. So far as 
relative results are concerned, the inclusion of this does not appear to affect the 
standing of any particular type materially. 
DESCRIPTION OF MODELS. 
In all, nine different forms were tried, the general designs being shown in 
Figs. 1 to 3, Plates 82 to 84, the bows and sterns being the same in all cases. It 
will be seen that they cover variations of ‘‘rake” forward and aft, shape of side, and 
shaped versus flat forms. The middle body in all cases was box-shaped with square 
corners. 
No. 1.—Rake one-fourth length, rounded sides. 
No. 2.—Rake one-eighth length, rounded sides. 
No. 3.—Rake 45°, straight side. 
No. 4.—Rake circular, straight side. 
No. 5.—Rake one-fourth length, straight side. 
No. 6.—Rake one-eighth length, straight side. 
*Col. L. H. Beach, chairman, and Colonels Newcomer, Potter and Keller. 
