I-class destroyer

The I-class destroyers were a group of nine destroyers, including a flotilla leader, built for the Royal Navy during the 1930s. Four similar ships were ordered by the Turkish Navy, of which two were purchased for the Royal Navy, bringing the number of these ships British service to 11—although three of the original ships had been lost by the time Inconstant and Ithuriel were commissioned. The I-class served in World War II and six were lost, with a seventh ship being written off.

The flotilla leader Inglefield
Class overview
Name: I class
Preceded by: G and H class
Succeeded by: Tribal class
In commission: 1937–1960
Completed: 13
Lost: 6
Scrapped: 7
General characteristics (as built)
Type: Destroyer
Length: 323 ft (98.5 m)
Beam: 33 ft (10.1 m)
Draught: 12 ft 5 in (3.8 m)
Installed power:
Propulsion: 2 shafts; 2 geared steam turbines
Speed: 36 knots (67 km/h; 41 mph)
Range: 5,530 nmi (10,240 km; 6,360 mi) at 15 knots (28 km/h; 17 mph)
Complement: 137 (peacetime), 145 (wartime)
Sensors and
processing systems:


The Is were a repeat of the preceding H class, except that they had ten torpedo tubes (two banks of five) instead of eight. They incorporated the new bridge and wheelhouse layout as tested in Hero and Hereward (except the flotilla leader Inglefield). Inglefield also had a larger tripod foremast, her sisters having pole masts. The extra weight of the torpedo tubes and the fitting of minesweeps and depth charge gear (previous vessels carried one or the other) on the same hull as the H class, caused a loss of stability, needing ballast when bunker levels were low.

All ships were fitted for minesweeping and with depth charges and Asdic for anti-submarine (A/S) work and were capable of conversion to minelayers. For this, they landed 'A' and 'Y' 4.7 inch guns, the torpedo tubes and their minesweeps, allowing carriage of up to 60 mines but only four ships were used like this (see below).

Turkish ships

The Turkish I-class ships were of a similar design to their British counterparts but shipped only eight torpedoes (two banks of four) like the British H class.

Wartime modifications

Early war modifications involved replacing the after bank of torpedoes with a QF 12-pounder (3 inch/76 mm) anti-aircraft (AA) gun, cutting down the after funnel and mainmast to improve its field of fire and adding a pair of QF 20 mm Oerlikon guns in the bridge wings. Radar Type 286, a metric wavelength surface-warning set, was added as it became available and the ineffective multiple 0.5 in (13 mm) Vickers machine guns were replaced with Oerlikons; the central tube was deleted from the torpedo launchers to lessen topweight. Icarus lost 'Y' gun to stow extra depth charges (for a total load of 110) and their mortars. Surviving ships received a third pair of Oerlikons, added abreast the searchlight position and the 12-pounder was deleted to increase depth charge stowage. In some ships, 'A' gun was replaced with a Hedgehog forward-throwing A/S weapon but this alteration seems to have been reversed at a later stage. Ilex, Intrepid, Impulsive and Isis had 'B' gun removed and two QF 6-pounder 10 cwt (2.25 inch/57 mm L/47) guns were added on the twin mounting Mark I* along with a Hedgehog, the former for anti-E boat work.

Inglefield later had the second bank of torpedo tubes re-instated but like her sisters, the central tube was removed. A 4 in (100 mm) AA gun was added in lieu of 'X' gun and she had six Oerlikons. Type 291 radar was later added at the foremast head as well as Huff-Duff in some ships.

The ex-Turkish ships were modified along similar lines to their I-class sisters. Inconstant later received Type 270 radar, a centimetric wavelength target-indication set, in lieu of the director and rangefinder on the bridge. Again, eventually six Oerlikons were carried.


Ship Builder Laid down Launched Commissioned Fate
D03 Icarus John Brown & Company, Clydebank 9 March 1936 26 November 1936 3 May 1937 Sold for scrap, 29 October 1946.
D61 Ilex 28 January 1937 7 July 1937 Sold for scrap, 1948.
D44 Imogen Hawthorn Leslie & Company, Hebburn 18 January 1936 30 October 1936 2 June 1937 Collided with the cruiser Glasgow 16 July 1940 and sunk.
D09 Imperial 29 January 1936 11 December 1936 30 June 1937 Severely damaged by air attack, 29 May 1941, sunk by torpedoes from Hotspur
D11 Impulsive J. Samuel White, Cowes 9 March 1936 1 March 1937 29 January 1938 Sold for scrap, 22 January 1946.
D02 Inglefield Cammell Laird & Company, Birkenhead 29 April 1936 15 October 1936 25 June 1937 Sunk by German radio-controlled glide bomb off Anzio, 25 February 1944
D10 Intrepid J. Samuel White, Cowes 6 January 1936 17 December 1936 29 July 1937 Sunk by German Ju 88 bombers off Leros, 26 September 1943
D87 Isis Yarrow & Company, Scotstoun 5 February 1936 12 December 1936 2 June 1937 Mined and sunk off Normandy beaches, 20 July 1944.
D16 Ivanhoe 12 February 1936 11 February 1937 24 August 1937 Mined and sunk off Texel, 1 September 1940

† = fitted as minelayers

Turkish ships

Four ships were ordered for the Turkish Navy in 1938. Upon the outbreak of war, two were purchased by the British but two were delivered to Turkey in 1942 as the Sultanhisar and the Demirhisar.

Ship Builder Laid down Launched Completed Fate
H49 Inconstant
Vickers, Barrow 24 May 1939 24 February 1941 24 January 1942 Acquired 14 November 1941, returned to Turkey 9 March 1946, sold for scrap, 1960.
H05 Ithuriel
15 December 1940 3 March 1942 Bombed at Bône 28 November 1942 and beached. Written-off 27 February 1943 and hulked. Sold for scrap, 25 August 1945.
H87 Sultanhisar William Denny, Dumbarton 21 March 1939 17 December 1940 28 June 1941 Delivered to Turkey in 1942, decommissioned 1960
H80 Demirhisar 1939 1941 1942 Delivered to Turkey in 1942, decommissioned 1960



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