When an ordinary Merchant ship, afloat on deep still water under no wind condition, is proceeding ahead by her own inertia only, her propellers having been completely stopped and her speed length ratio
K/√<L> (where
K is speed in knots and
L is L. P. P. in feet) is less than 0.4, resistances acting upon the ship are principally skin resistance and the resistance of stopped propellers dragging through the water, as the wave making resistance is practically negligible. The present paper deals with the above mentioned dragging resistance of stopped propellers of a ship longer than 400 feet, proceeding at a speed from 8 to 3 knots.
The loss of kinetic energy in ft. tons of a ship of
W tons displacement, in the course of an interval between the instant when her velocity was
v1 ft. pre sec. and the instantwhen her velocity became
v2 ft. per sec., can be calculated as follow:-
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