"T" class Attack Submarines
 
Individual Specification
Name Pennant Builder Completed Fate
Group 1
Triton * ³ 15T Vickers 9/11/38 Probably mined in South Adriatic, c. 7/12/40
Thetis * 11T Cammell-Laird 26/10/40 Foundered Liverpool Bay on trials, 1/6/39. Salvaged 23/10/39 as Thunderbolt.
Depth-charged by Italian corvette Cicogna off Cape St. Vito, 14/3/43
Tribune § 76T Scotts 17/10/39 Scrapped 1947
Trident ² 52T Cammell-Laird 1/10/39 Scrapped 1946
Triumph 18T Vickers 2/5/39 Probably mined off Cape Sunion, c. 9/1/42
Taku * 38T Cammell-Laird 3/1/40 Scrapped 1946
Tarpon 17T Scotts 8/3/40 Depth-charged by German minesweeper M.6 in North Sea, 10/4/40
Thistle 24T Vickers 4/7/39 Sunk by German submarine U.4 off Utsira, 10/4/40
Tigris 63T Chatham RDY 20/6/40 Depth-charged by German trawler Uj.2210 off Capri, 27/2/43
Triad 53T Vickers 16/9/39 Probably mined off Benghazi, c. 13/10/40
Truant 68T Vickers 31/10/39 Wrecked off Cherbourg en route to scrapping, 9/12/46
Tuna § 94T Scotts 1/8/40 Scrapped 1946
Talisman * 78T Cammell-Laird 29/6/40 Probably mined in Sicilian Channel, c. 16/9/42
Tetrarch 77T Vickers 15/2/40 Probably mined off Sardinia, c. 29/10/41
Torbay ² 79T Chatham RDY 14/1/41 Scrapped 1945
Group 2
Tempest * N86 Cammell-Laird 6/12/41 Depth-charged by Italian motor boat Circe in Gulf of Taranto, 13/2/42 &
later foundered under tow
Thorn * N11 Cammell-Laird 26/8/41 Depth-charged by Italian motor boat Pegaso off Gavdo Island, 6/8/42
Thrasher * N37 Cammell-Laird 14/5/41 Scrapped 1947
Traveller ¶ N48 Scotts 10/4/42 Probably mined off Taranto, c. 4/12/42
Trooper ¶ N91 Scotts 29/8/42 Probably mined off Leros, c. 10/10/43
Trusty N45 Vickers 30/7/41 Scrapped 1947
Turbulent N98 Vickers 2/12/41 Probably mined off Sardinia, c. 17/3/43
Group 3
Tutankhamen P311 Vickers 7/8/42 Probably mined off Maddalena, c. 8/1/43
Tresspasser + P312 Vickers 25/9/42 Scrapped 1961
Taurus P313 Vickers 3/11/42 To Netherlands as Dolfijn, 1948 - 1953. Returned & scrapped 1960
Tactician P314 Vickers 29/11/42 Scrapped 1963
Truculent µ P315 Vickers 31/12/42 Collided with mercantile Dvina off The Nore 12/1/50. Salved 14/3/50.
Scrapped 1959.
Templar P316 Vickers 15/2/43 Expended as target in Loch Striven, 1955. Salved & scrapped 1958~9
Tally-ho! µ P317 Vickers 12/4/43 Scrapped 1967
Tantalus + P318 Vickers 2/6/43 Scrapped 1950
Tantivy µ P319 Vickers 25/7/43 Expended as target in Cromarty Firth, 1951
Telemachus + P321 Vickers 25/10/43 Scrapped 1961
Talent P322 Vickers 4/12/43 To Netherlands as Zwaardvisch, 1943. Zwaardvis, 1944. Scrapped 1963
Terrapin P323 Vickers 22/11/44 Depth-charge by Japanese ships in Sth. Pacific 19/5/45 & written off.
Scrapped 1946
Thorough + P324 Vickers 1/3/44 Scrapped 1961
Thule P325 Devenport RDY 13/5/44 Scrapped 1962
Tudor P326 Devenport RDY 16/1/44 Scrapped 1963
Tireless P327 Portsmouth RDY 18/4/45 Scrapped 1968
Token P328 Portsmouth RDY 15/12/45 Scrapped 1970
Tradewind P329 Chatham RDY 18/10/43 Scrapped 1945
Trenchant P331 Chatham RDY 26/2/44 Scrapped 1963
Tip-toe P332 Vickers 12/6/44 Scrapped 1971
Trump P333 Vickers 8/7/44 Scrapped 1971
Taciturn P334 Vickers 8/10/44 Scrapped 1971
Tapir P335 Vickers 30/12/44 To Netherlands as Zeehond, 1948 - 1953, returned & scrapped 1966
Tarn + P336 Vickers 6/4/45 To Netherlands as Tijerhaai, 1945 - 1962, returned & scrapped 1966
Tasman P337 Vickers 27/7/45 Renamed Talent, 1945. Scrapped 1970
Teredo P338 Vickers 13/4/46 Scrapped 1965
Tabard P342 Scotts 25/6/46 Scrapped 1974
Totem P352 Devenport RDY 9/1/45 To Israel 1964 as Dakar, loss unexplained in Mediterannean, 25/1/68
Truncheon P353 Devenport RDY 25/5/45 To Israel 1968 as Dolphin
Turpin P354 Chatham RDY 18/12/44 To Israel 1965 as Leviathan
Thermopylae P355 Chatham RDY 5/12/45 Scrapped 1970
² = Displacement variation, see table
³ = Displacement variation, see table
+ = Displacement variation, see table
¶ = Machinery variation, see table
* = Machinery variation, see table
§ = Machinery variation, see table
µ = Machinery variation, see table
1:600 HM submarine Trident, group 1 "T" class. This was the original design, with a bulbous
nose housing two external torpedoes, and two more external torpedoes firing forward from
amidships. The bulbous nose created a large wake, and this hampered vision through the
periscope. Most of the surviving boats later had the finer group 2/3 nose, and the amidships
tubes angled backwards. Some even had a stern tube added. © Andrew Arthur
1:600 HM submarine Thrasher, group 2 "T" class. The main change was the fining of the nose,
to create less wake, exposing the external nose torpedoes. Later, surviving boats had their
amidships tubes angled backwards, and some had an external torpedo added aft and even a
20mm cannon at the back of the conning tower. © Andrew Arthur
1:600 HM submarine Tudor, group 3 "T" class. An all-round improved group 1/2, with a fined
nose, rear-firing amidships torpedo and an aft torpedo. A 20mm cannon was fitted at the after
end of the conning tower. © Andrew Arthur

This class was designed to replace the "O", "P" and "R" classes in the colonial role, but in a smaller hull to suit them more to home & Mediterannean operations, and a 42 day patrol was specified.
The London Naval Treaty allowed 16,500 tons of submarines, so to secure enough units, a maximum displacement of 1,100 tons was specified.
400 tons smaller than the subs they replaced, they were never-the-less better armed, longer ranging, faster and deeper diving if slightly slower on the surface than their predecessors. They were the first class to have reversible diesel engines, so it was no longer necessary to use the electric motors for manouvering. Torbay
and Tridenthad one ballast tanks converted to a fuel bunker, for an aditional 46 tons of fuel.
In the original group 1 ships, all torpedoes were grouped firing forward, but this was found not to be the best arrangement, and in group 2 and 3, and group 1 ships after refit, the amidships tubes were moved aft and angled backwards, and in the group 3, and group 2 under refit, a stern tube was added, and the casing extended right aft. In the group 1, the bulbous fairing covering the forward external tubes caused a large wake at periscope depth, impairing vision forward. In later groups, and some refitted ships, the casing was fined, exposing the tubes, and giving a knife edged appearance.
In 1944, Truant was fitted with a snorkel, but this could not be implemented class wide until post war. This was not a real problem, British submarines never really faced stiff competition from an advanced enemy escort force, and had the relative luxury of being able to surface at night 90% of the time to re-plenish air and re-charge batteries. Also, unlike many other countries' submarines, a lot of attention and space was paid to air scrubbers, coolers and re-circulators to keep a submarine's air bearable for many long hours.
Late war, Tactician, Tally-Ho!, Tantalus, Tantivy and Taurus had a rivited ballast tank welded shut and changed into a feul bunker for a further 86 tons of diesel, extending range to 11,000 nautical miles and displacement to 1442 tons on the surface.
The classes were first partly, then wholly welded, and had the longest endurance of all WW2 RN subs, Tantalus setting a record of 56 days from home, 40 on station. They were most sucessful, and useful, and only replaced when the equivalent "A" class was introduced.

Dimensions
  Group 1 Group 2 Group 3   Group 1 Group 2 Group 3
Empty Displacement 1090 tons (³=1095) 1090 tons 1090 tons Length 275 (³ =277.25)' 273.5' 273.25'
Surfaced Displacement 1222 tons (²=1268; ³=1267) 1222 tons 1219 tons (+=1222) Beam 26.5' 26.5' 16.25'
Submerged Displacement 1575 tons (³=1579) 1575 tons 1567 tons Draft 14.25 (² =14.5)' 14.25' 14.75'
               
               
Performance & Propulsion    
Group 1 Group 2 Group 3
Range
132 tons fuel = 8000nm @ 10 kts = 42 days or;
² = 178 tons fuel
132 tons fuel = 8000nm @ 10 kts = 42 days 129 tons fuel = 8000nm @ 10 kts = 42 days
+ = 132 tons fuel
Dive
300' 300' 350'
Speed
15.25 kts surfaced, 8.75 kts submerged
Machinery
2 x 6cyl. Vickers deisels or;
§ = 2 x 6cyl. Admirality diesels @ 2500bhp
2 x 6cyl. Vickers deisels or;
¶ = 2 x 6cyl. MAN diesels or;
* = 2 x 6cyl. Sulzer diesels @ 2500bhp
2 x 6cyl. Vickers deisels or;
µ = 2 x 6cyl. Admirality diesels @ 2500bhp
> 2 x Laurence Scott electric motors @ 1450 shp <
     
     
Armament & Complement
Complement
Group 1 Group 2 Group 3
5 officers & 45 ratings 5 officers & 45 ratings 6 officers & 55 ratings
Armament
  • Torpedo;

    6 x 21" bow tubes ( internal )
    2 x 21" bow tubes ( external )
    2 x 21" amidships tubes ( external )
    16 x 21" torpedoes
  • Gun;

    1 x 1 x 4" AA
    3 x 1 x 0.303" MG AA
  • Torpedo;

    6 x 21" bow tubes ( internal )
    2 x 21" bow tubes ( external )
    2 x 21" amidships tubes ( external )
    1 x 21" stern tube ( external )
    17 x 21" torpedoes
  • Gun;

    1 x 1 x 4" AA
    3 x 1 x 0.303" MG AA
  • Torpedo;

    6 x 21" bow tubes ( internal )
    2 x 21" bow tubes ( external )
    2 x 21" amidships tubes ( external )
    1 x 21" stern tube ( external )
    17 x 21" torpedoes
  • Gun;

    1 x 1 x 4" AA
    1 x 2 x 20mm Oerlikon AA
    2 x 1 x 0.303" MG AA
 
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