Editing I-class destroyer (section)

==Design==
The I-class was a repeat of the preceding [[G and H-class destroyer|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 {{HMS|Hero|H99|2}} and {{HMS|Hereward|H93|2}} (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 tank|ballast]] when bunker levels were low.

All ships were fitted for [[minesweeper (ship)|minesweeping]] and with [[depth charge]]s and [[Asdic]] for [[anti-submarine warfare|anti-submarine]] (A/S) work and were capable of conversion to [[minelayer]]s. For this, they landed 'A' and 'Y' 4.7&nbsp;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).

===Ships built for Turkey===
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 [[12-pounder gun|QF 12-pounder]] (3 inch/76&nbsp;mm) [[anti-aircraft warfare|anti-aircraft]] (AA) gun, cutting down the after funnel and mainmast to improve its field of fire and adding a pair of [[Oerlikon 20 mm cannon|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 {{convert|0.5|in|mm|abbr=on}} [[Vickers machine gun]]s 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 (weapon)|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 gun|QF 6-pounder]] 10 cwt (2.25 inch/57&nbsp;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 {{convert|4|in|mm|abbr=on}} AA gun was added instead 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 place of the director and rangefinder on the bridge. Again, eventually, six Oerlikons were carried.