Surfaced: 9,700 nautical miles at 8 knots. Submerged: 60 nautical miles at 4 knots.
Armaments:
8 x 21 inch torpedo tubes ( 6 in the bow, two in the stern), 14 torpedoes carried. 1 x 4.7 inch deck gun.
Historical
Data
Rainbow Class of four submarines, three of which were built in the shipyard in Barrow, the lead boat Rainbow was built in the Royal Dockyard at Chatham.
The Barrow built boats Regent, Regulas and Rover all being launched on the same day, 11th July 1930.
These were the first British submarines to be fitted with a bathroom for the officers. There was however no increase in fresh water capacity.
On commissioning the entire class was sent to Hong Kong until the outbreak of WWII.
1940 sent to the Mediterranean , patrolling from Alexandria.
On the 7th December 1940 Regulas was listed as overdue in the Straits of Tarento, it is though that she hit a mine.