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46
THE SUBMARINE TORPEDO BOAT
surface speeds on account of the high free-board, but owing
to its much greater wetted surface in comparison with
the single hull boat when submerged, it cannot make as
great speed under water with the same outlay of power
as this other type because of the greatly increased skin
friction.
With the single hull boat a very high surface speed will
probably be unattainable because of the relatively greater
ratio of displacement on the surface to the available power
as compared with the double hull construction, and be-
cause of the lack of longitudinal stability of this condition.
The choice of selection then, would resolve itself not so
much upon a question as to whether one type is of greater
inherent stability than the other, but upon the decision
as to whether the surface or the submerged speed is to be
considered as of greater tactical value from a military
standpoint.
THE DIVING Boat versus the Submerging Boat
A further distinction of types which is perhaps more
real than in the previous classification is signified by what
is known as the diving type and the submerging type.
These types are interrelated to submarines and submers-
ibles and are the crucial distinctive features of perform-
ance between the two.
The diving boats were controlled by horizontal rudders
at the stern and got under water by inclining the axis of
the boat and diving.
The submerging boats, often called the “even keel”
boats, are forced under water bodily by means of hydro-
planes situated equally distant fore and aft of the center
of buoyancy of the boat. By inclining these planes the