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80
THE SUBMARINE TORPEDO BOAT
/. b.D3V5
E.H.P.= 0.00307 f.S.v."t + L
The wetted surface S= CVD.X L. where
S equals surface excluding rudder, bossings, etc.
D equals displacement.
L equals length immersed.
C equals constant given in Table 3 corresponding to
B..
the ratio of beam - draught : H as given by Taylor.
Table III
Constants for Wetted Surface
Given by Taylor
B-H Constant B-H Constant B-H Constant B-H Constant
2.0 15.63 2-4 15.50 2.8 15.55 3.2 15-71
2.1 15.58 2.5 15.50 2.9 15.58 33 15.77
2.2 15.54 2.6 15.51 3.0 15.62 3.4 15-83
2.3 15.51 2.7 15:53 3.1 15.66
Propulsive System
The propulsion of the submarine is acquired at the
present time by two distinct power units — the internal
combustion engine for surface propulsion and electric
motors and storage batteries for submerged propulsion.
This system is attended with many complications and
undesirable features which until recently have been
accepted as necessary evils. A solution of this problem
is being sought for now by several engineers and con-
siderable success has already been attained.