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T1 Class, British Submarines


Photograph of T1 class submarine

Imperial War Museum. Via Wikimedia Commons


Specifications:


Displacement

1326 tons surfaced
1550 tons submerged

Dimensions

275'0" by 26'7" by 12'0"
83.6m by 8.1m by 3.6m

Maximum speed      

15.25 knots surfaced
9 knots submerged

Dive to 330 feet
to 100 meters

Complement

56

Armament

10 21" torpedo tubes (16 torpedoes or 18 mines)
1 4"/40 dual-purpose gun
3 0.303 Lewis machine guns
Machinery
2-shaft diesel (2500 hp) or electric (1450 hp)

Range

8000 nautical miles (15,000 km) at 10 knots surfaced
130 nautical miles (240 km) at 2.5 knots submerged

Bunkerage 132 tons diesel oil
Modifications 1942: Several units added an aft torpedo tube and a 20mm Oerlikon AA gun.

The T1s were the first of one of Britain's most successful submarine design series, being well-liked by their crews. They were built from 1936-1942 and the design emphasized ease of construction and maintenance. Since the naval disarmament treaties were still in effect when they were designed, they were held to less than 1400 tons displacement so that a large number could be constructed within the treaty total tonnage limit. This limited their surface speed. All ten of their tubes could be fired at a target ahead, though only six could be reloaded. (The remaining four were in external tubes on the bow and amidships.) An eleventh tube was added to the stern in 1942 to improve their survival when under pursuit.


Units in the Pacific:

Truant     
Arrived 1942-1

Trusty     
Arrived 1942-1

Trident     
Arrived 1943-8

Torbay     
Arrived 1945-6-24


References

Bagnasco (1977)

McCartney (2006)

Worth (2001)



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