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Great Britain's "I" class destroyers

Photos

  • D09 HMS Imperial destroyer
  • D10 HMS Intrepid destroyer
  • D11 HMS Impulsive destroyer
  • D16 HMS Ivanhoe destroyer
  • D44 HMS Imogen destroyer
  • D87 HMS Isis destroyer

Design

The were tripod mainmasts in all, and a tripod foremast in the HMS Inglefield.

Armament

All of the "I" class had pentad (5) torpedo tubes on each launcher. The HMS Inglefield had the penta torpedo launchers changed to quad launchers in 1942 and 50 tons of ballast was added.

The extra torpedo tubes, compared to prior classes, caused the "I" class to be top heavy and not as stable. A casing over the engine room was removed to help with stability.

The "I" class was designed to be converted to minelayers. When converted, the 'A' and 'Y' guns, torpedo tubes, and TSDS (two speed destroyer sweep) minesweeping gear was removed. Only the Icarus, Impulsive, Intrepid, and Ivanhoe were converted.

Ships

HMS Inglefield, D.02, "I" class leader

  • Builder: Cammell Laird
  • Cost: £320,000
  • April 29, 1936: Laid down
  • October 13, 1936, October 15, 1936: Launched
  • June 25, 1937: Commissioned
  • 1939: Mediterranean
  • 1939: Home Fleet.
  • February 1940: Helped sink U63.
  • April 1940: Norway
  • August - September 1940: Dakar. Hit by shore batteries.
  • 1941: Hunt for KMS Bismarck.
  • 1941: Raid on Petsamo.
  • 1942: Escorted USS Wasp in aircraft transport to Malta.
  • 1942: Center tube in torpedo launchers removed. 'Y' gun replaced by 3" HA. Radar 286 and HF/DF added.
  • 1942 - early 1943: Artic convoy escort
  • April 1943: Escort North Atlantic convoys with 4th Support Group
  • July 1943: Sicily
  • September 1943: Salerno
  • January 1944: Anzio
  • February 25, 1944: Sunk by an HS 293 glider bomb off Anzio

HMS Icarus, D.03

  • Builder: John Brown, Clydebank
  • Cost: £320,000
  • March 16, 1936: Laid down
  • November 26, 1936: Launched
  • May 3, 1937: Commissioned
  • 1939: Mediterranean
  • 1939: Home Fleet
  • 1939 - 1945: Western Approaches
  • December 1939: Joined 20th Destroyer Flotilla for mine laying.
  • April 1940: Norway. 2nd Battle of Narvik.
  • 1942: Mediterranean. Operation Harpoon and Operation Pedestal.
  • 1944: Rearmed to be escort. 'Y' gun replaced by extra depth charges (110) and throwers. 3" HA gun replaced by two 20 mm Oerlikons on the searchlight platforms.
  • 1946: Broken up
  • August 1946: Sold
  • October 29, 1946: Scrapped at Troon

HMS Ilex, D.61

  • Builder: John Brown, Clydebank
  • Cost: £320,000
  • March 16, 1936: Laid down
  • January 28, 1937: Launched
  • July 7, 1937: Commissioned
  • 1939: Mediterranean
  • 1939: Home Fleet
  • April 1940: Norway
  • May 14, 1940: Sent to Mediterranean.
  • June 1940: With HMS Dainty sank Italian submarines Liuzzi and Scebeli.
  • July 19, 1940: Help sink Bartolomeo Colleoni.
  • 1940: Sank MTB MAS537.
  • June 1941: Badly damaged by bombing off Syria. Sailed to United States for repair.
  • 1943: Mediterranean.
  • 1943: Helped sink Italian submarine Nereide.
  • January 1944: Heavily damaged and declared constructional total loss.
  • 1947: Sold
  • 1948: Broken up. Scrapped in Italy.

HMS Imogen, D.44

  • Builder: Hawthorne Leslie
  • Cost: £320,000
  • January 18, 1936: Laid down
  • October 30, 1936: Launched
  • June 2, 1937: Commissioned
  • 1939: Mediterranean
  • 1939: Home Fleet
  • April 1940: Norway
  • July 16, 1940: Collision with HMS Glasgow off Pentland Firth.

HMS Imperial, D.09

  • Builder: Hawthorne Leslie
  • Cost: £320,000
  • January 22, 1936: Laid down
  • December 11, 1936: Launched
  • June 30, 1937: Commissioned
  • 1939: Mediterranean
  • 1939: Home Fleet
  • April 1940: Norway
  • May 14, 1940: Sent to Mediterranean.
  • October 11, 1940: Damaged by mine off Malta.
  • October 1940 - March 1941: Repairs.
  • May 28, 1941: Near miss by a bomb caused steering to fail.
  • May 29, 1941: Sunk by HMS Hotspur.

HMS Impulsive, D.11

  • Builder: White, S. White
  • Cost: £320,000
  • March 10, 1936: Laid down
  • March 1, 1937: Launched
  • January 29, 1938: Commissioned
  • 1939: Mediterranean
  • 1939: Home Fleet
  • 1939 - 1945: Western Approaches
  • December 1939: Joined 20th Destroyer Flotilla for mine laying.
  • April 1940: Norway
  • 1946: Broken up.
  • January 22, 1946: Sold. Scrapped at Sunderland.

HMS Intrepid, D.10

  • Builder: White, Thornycroft
  • Cost: £320,000
  • January 13, 1936: Laid down
  • December 17, 1936: Launched
  • July 29, 1937: Commissioned
  • 1939: Mediterranean
  • 1939: Home Fleet
  • May - June 1940: Helped with evacuations from Belgium, France, and Holland. Was damaged.
  • 1940 - 1943: Escort in Artic.
  • 1943: Western Approaches.
  • July 1943: Sicily
  • September 1943: Salerno. Dodecanese.
  • September 26, 1943, September 27, 1943: Sunk in Leros harbor.

HMS Isis, D.87

  • Builder: Yarrow, A. Yarrow
  • Cost: £320,000
  • February 6, 1936: Laid down
  • November 12, 1936: Launched
  • June 2, 1937: Commissioned
  • 1939: Mediterranean
  • 1939: Home Fleet
  • December 1939: Joined 20th Destroyer Flotilla for mine laying.
  • April 1940: Norway
  • 1941: Evacuation of Greece and Crete.
  • June 1941: Damaged by bombs off Syria. Sailed to Singapore for repairs.
  • December 1941: Before fall of Singapore to Japanese was towed to Java, Colombo, and then Bombay for repairs.
  • 1943: Mediterranean. Helped sing U562.
  • June 1944: Normandy.
  • July 20, 1944: Sunk by mines. Sunk by Neger midget submarines.

HMS Ivanhoe, D.16

  • Builder: Yarrow, A. Yarrow
  • Cost: £320,000
  • February 6, 1936: Laid down
  • February 11, 1937: Launched
  • August 24, 1937: Commissioned
  • 1939: Mediterranean
  • 1939: Home Fleet
  • December 1939: Joined 20th Destroyer Flotilla for mine laying.
  • April 1940: Norway
  • May - June 1940: Helped with evacuations from Belgium, France, and Holland. Was damaged.
  • September 1, 1940: Heavily damaged by German mines. Took under town but bombing broker Ivanhoe's back. Sunk by HMS Kelvin.

Specifications

  "I" Class
Crew 145
Physical Characteristics  
Displacement 1,335 - 1,370 tons, 1,370 tons
1,391 tonnes
Displacement - Loaded 1,854 - 1,890 tons, 1,888 tons
1,918 tonnes
Length 323'
98.45 m
Length - Between Perpendiculars 312'
95.09 m, 95.1 m
Length - Water Line 320'
97.5 m
Beam 32' 3", 33'
10.05 m, 10.06 m
Draft - Mean 8' 6", 12' 5"
3.78 m
Performance  
Speed 36 knots
Range at 15 knots 5,530 nautical miles
Armament 4: 4.7"/45 QF Mk IX (4 x 1), 4.7" (4 x 1)
Anti-Aircraft 8: .5" AA (2 x 4)
Torpedo Tubes 10: 21" (2 x 5)
Mines - Icarus, Impulsive, Intrepid, Ivanhoe 60
Engines  
Boilers 3: Admiralty 3-drum
Shafts 2
Turbines Parsons geared, Geared
HP 34,000
Oil 443 - 461 tons, 470 tons
477 tonnes
  "I" Class - Later
Physical Characteristics  
Displacement - Loaded 1,980 - 2,095 tons
Draft - Mean 13' - 13' 4"
3.96 m - 4.06 m
  HMS Inglefield
Crew 175, 178
Physical Characteristics  
Displacement 1,530 tons, 1,544 tons
1,568 tonnes
Displacement - Loaded 2,081 tons
2,114 tonnes
Length 337'
102 m, 102.72 m
Length - Between Perpendiculars 326'
99 m, 99.36 m
Length - Water Line 327'
99.6 m
Beam 34'
10.36 m
Draft - Mean 9', 12' 6", 12' 9"
3.89 m
Draft - Mean - Later 13' 6"
4.11 m
Performance  
Speed 36 knots, 36.5 knots
Range at 15 knots 5,530 nautical miles
Armament 5: 4.7"/45 QF Mk IX (5 x 1)
Anti-Aircraft 8: .5" AA (2 x 4)
Torpedo Tubes 10: 21" (2 x 5)
Engines  
Boilers 3: Admiralty 3-drum
Shafts 2
Turbines Parsons geared
HP 38,000
Oil 470 tons
477 tonnes
  HMS Inglefield - later
Crew  
Physical Characteristics  
Displacement - Loaded 2,270 tons
Length  
Length - Between Perpendiculars  
Length - Water Line  
Beam  
Draft - Mean  
Performance  
Speed  
Armament 4: 4.7"
Anti-Aircraft 1: 3" HA
4: 20 mm
Torpedo Tubes 8: 21" (4 x 2)
Depth Charges 38
Engines  
Boilers  
Shafts  
Turbines  
HP  
Oil  

Sources:

  1. Conway's All the World's Fighting Ships 1922-1946, Robert Gardiner, 1987
  2. Destroyers of World War Two, M. J. Whitley, 1988
  3. Warships of World War II, H. T. Lenton & J. J. Colledge, 1964
  4. Janes' Fighting Ships of World War II, 1989
20th Century American Military History Crucial Site