1 shaft petrol/ electric (later diesel electric)
200 hp/100 hp
8.5 knots surfaced / 5.5 knots submerged
4 external torpedoes in drop collars, 1 machine gun (later 1 x 47mm gun)
The Kasatka class were a group of submarines built for the Imperial Russian Navy. The six boats were built between 1904 and 1905. They were designed by I.G. Bubnov and were based on the Delfin. The first boat Kasatka experienced significant problems with stability on trials and had to have extra flotation added. The boats were re-built around 1910 with diesel engines added (120 hp) and new conning towers replacing the older structure.