British R Class Submarine
The R-class submarines were a class of 12 small British diesel-electric submarines built for the Royal Navy during World War I, and were forerunners of the modern hunter-killer submarines, in that they were designed specifically to attack and sink enemy submarines, their battery capacity and hull shape being optimized for underwater performance.
With a submerged speed of 14 kn (26 km/h; 16 mph), the class set an underwater speed record not broken until the experimental Japanese Submarine No.71 of 1938, which was capable of more than 21 kn (39 km/h; 24 mph) submerged.
Read more about British R Class Submarine: Description, Construction, Service, R-class Submarines
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