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fighting ships of the world

ROYAL NAVY - UNITED KINGDOM

SUBMARINES

'G' submarines (1915-1917)

G10 1916

Name No Builder Laid down Launched Comp Fate
G1 IA3 Chatham DYd 10/1914 14/8/1915 12/1915 sold 2/1920
G2 IA4 Chatham DYd 10/1914 23/12/1915 3/1916 sold 1/1920
G3 IA5 Chatham DYd 10/1914 22/1/1916 3/1916 sold 11/1921
G4 IA6 Chatham DYd 10/1914 23/10/1915 2/1916 sold 6/1928
G5 IA7 Chatham DYd 10/1914 23/11/1915 1/1916 sold 10/1922
G6 IA8 Armstrong, Elswick 12/1914 7/12/1915 5/1916 sold 11/1921
G7 IA9 Armstrong, Elswick 12/1914 4/3/1916 8/1916 sunk 1/11/1918
G8 I0C Vickers, Barrow 12/1914 1/5/1916 6/1916 sunk 14/1/1918
G9 I1C Vickers, Barrow 12/1914 15/6/1916 8/1916 sunk 16/9/1917
G10 I2C Vickers, Barrow 3/1915 11/1/1916 4/1916 sold 1/1923
G11 I3C Vickers, Barrow 3/1915 22/2/1916 5/1916 wrecked 22/11/1918
G12 I4C Vickers, Barrow 4/1915 24/3/1916 6/1916 sold 2/1920
G13 I5C Vickers, Barrow 4/1915 18/7/1916 9/1916 sold 1/1923
G14 I6C Scotts, Greenock 12/1914 17/5/1917 8/1917 sold 3/1921
G15   White, Cowes 1915 --- --- cancelled 4/1915

 

Displacement standard, t

 

Displacement normal, t

703 / 837

Length, m

57.0

Breadth, m

6.94

Draught, m

4.07

No of shafts

2

Machinery

G1 - 13: 8-cyl Vickers diesels / electric motors

G14: FIAT diesels / electric motors

G15: MAN diesels / electric motors

Power, h. p.

1600 / 840

Max speed, kts

14.5 / 9

Fuel, t

diesel oil 44

Endurance, nm(kts) 2400(12) / 95(3)

Armament

G1 - 8, 10, 11: 1 x 1 - 76/28 12pdr 8cwt QF Mk I, 1 - 533 TT (stern, 2), 4 - 450 TT (2 bow, 2 beam, 8)

G9, 12, 13, 14: 1 x 1 - 76/30 10cwt QF Mk II, 1 - 533 TT (stern, 2), 4 - 450 TT (2 bow, 2 beam, 8)

Complement

30

Diving depth operational, m 30

Ship project history: The Admiralty, reacting to a rumour in 1913 that almost the whole German U-boat effort had been turned over to double-hulled overseas boats, was panicked into requesting a boat with displacement similar to the 'E' class, a partial double hull, a single 533mm TT forward and two 450mm beam tubes. Out of this emerged the 'G' class, 7 units being ordered under the 1914-15 Estimates: G1-7 were ordered pre-war and G8-13 ordered on 24 November 1914 as part of Fisher's expansion of the submarine force. The firms invited to tender for G6, G7, G14 and G15 were allowed to install their own diesels, so Armstrong Whitworth proposed to put MAN Nuremberg type in G6, and Sulzers in G7; Scott's proposed to put FIAT engines into G14 and White proposed to put their license-built MAN type into G15 (cancelled in 1915). The impossibility of getting German diesels led to G6 and G7 being engined with Vickers standard diesels. The standard 'G's had the same diesel as the 'E's, so to speed up production of existing 'E's Chatham DYd were allowed to divert the diesels ordered for G2-5 into E19-32. The engines were presumably replaced by engines built at Chatham. During construction the armament was changed. The 533mm tube was moved aft and two 450mm bow tubes were substituted. The 'G's thus introduced the 533mm torpedo to British submarines, although Swordfish had been ordered a year earlier.

Modernizations: 1916-1917, G2-8, 10, 11: - 1 x 1 - 76/28; + 1 x 1 - 76/30 10cwt QF Mk II

1917-1918, 5 submarines: + 1 x 1 - 40/37 2pdr QF Mk III

Naval service: G7 and G8 were lost 1/11/1918 and 1/5/1916 by unknown causes in the North Sea. G9 was sunk 16/9/1917 off Norway in error by RN destroyer Petard. G11 wrecked during a storm off Harwich 22/11/1918.

Ivan Gogin, 2008-13