The Tribal or F class was a class of destroyers built for the Royal Navy. Twelve ships were built between 1905 and 1908 and all saw service during World War I, where they saw action in the North Sea and English Channel as part of the 6th Flotilla and Dover Patrols.

This article includes a list of general references, but it lacks sufficient corresponding inline citations. (January 2013)

Quick Facts Class overview, General characteristics ...

HMS Crusader
Class overview
Name	Tribal (or F)
Operators	Royal Navy
Preceded by	River class
Succeeded by	Beagle (or G) class
Built	1905–1908
In commission	1907–1920
Completed	12
General characteristics
Type	Destroyer
Displacement	860 - 940 tons
Length	275 ft (84 m)
Beam	28 ft (8.5 m)
Draught	8 ft 6 in (2.59 m)
Propulsion	2 or 3 shaft steam turbines, 12,500 shp (9,300 kW) ca.200 tons oil
Speed	33 knots (61 km/h; 38 mph)
Armament	5 × QF 12 pdr 12 cwt Mark I, mounting P Mark I or 2 × BL 4 in L/40 Mark VIII, mounting P Mark V 2 × single tubes for 18-inch (450-mm) torpedoes

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The preceding River- or E-class destroyers of 1903 had made 25.5 knots (47.2 km/h; 29.3 mph) on the 7,000 ihp (5,200 kW) provided by triple expansion steam engines and coal-fired boilers, although HMS Eden was powered by steam turbines.^[1] In November 1904, the First Sea Lord "Jackie" Fisher proposed that the next class of destroyers should make at least 33 knots (61 km/h) and should use oil-fired boilers and steam turbines as a means of achieving this.^[2] This resulted in a larger ship to provide the required doubling of installed power over their predecessors, but also pushed the design to the limits of capability of contemporary technology. As a result, the Tribals were severely compromised and a somewhat retrograde step after the successful River class; they were lightly built and proved to be fragile in service.^{[citation needed]} More alarmingly however, they were only provided with 90 tons of bunkerage, and with high fuel consumption resulting from a high power output of 12,500 shp (9,300 kW), they were highly uneconomical and had a severely limited radius of action; Afridi and Amazon once used 9.5 tons of oil each simply to raise steam for a three-mile (5 km) return journey to a fuel depot.

Design details were left to the individual builders, as was Royal Navy practice at the time for destroyers. As a result, no two were alike^[3][4] and there was considerable heterogeneity of detail and appearance, Most noticeably the number of funnels varied from three, in Cossack and Ghurka, to six in Viking; the latter, with two single and two pairs of funnels becoming the only six-funneled destroyer ever built. With a light mainmast aft, they were the first British destroyers to have two masts.

The first five ships were designed with the armament of three QF 12-pounder guns, an improvement from the single 12-pounder and five 6-pounder guns that the River class was completed with, while the number of torpedoes remained at two 18-inch (457 mm) tubes.^[5][6] From the sixth ship (Saracen) onwards, however, the armament was again increased, to a pair of BL 4-inch (102 mm) guns, with one gun mounted forward and another on the quarterdeck.^[7] From October 1908, the first five ships were modified by adding another pair of 12 pounder guns.^[8]

The shift towards the larger Tribals also created a requirement for a complementary class of smaller "Coastal" destroyers giving rise to the Cricket class of small TBD, of which 36 were built between 1905 and 1908. The result of this experiment was not ideal and for the following class of destroyers (the 'G', or Beagle, class) the Admiralty reverted to a single, more uniform design for the 1908-9 programme.

Seven ships to the Admiralty specification were originally envisaged, but only five vessels were ordered and built under the 1905-06 Programme, all to their builders' own designs.

Five more vessels were proposed, but only two were ordered and built under the 1906-07 Programme.

A final five vessels were ordered and built under the 1907-08 Programme.

In October 1916, it was proposed on 8 November 1916 that the two undamaged 'ends' might be joined together, which was completed at Chatham Royal Dockyard 7 June 1917 by joining the undamaged fore section of Zulu and the rear section of Nubian respectively. The resulting destroyer was commissioned on 7 June 1917 as Zubian, which was sold for scrapping 1919.