British G-class submarine
G9
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| Class overview | |
|---|---|
| Name: | G |
| Builders: | |
| Operators: |
 Royal Navy
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| Completed: | 14 |
| Cancelled: | 1 |
| Lost: | 4 |
| Scrapped: | 10 |
| General characteristics | |
| Type: | Submarine |
| Displacement: |
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| Length: | 187 ft 1 in (57.0 m) |
| Beam: | 22 ft 8 in (6.9 m) |
| Draught: | 13 ft 4 in (4.1 m) |
| Installed power: |
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| Propulsion: |
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| Speed: |
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| Range: | 2,400 nmi (4,400 km; 2,800 mi) at 12.5 kn (23.2 km/h; 14.4 mph) surfaced |
| Complement: | 22 |
| Armament: |
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The Royal Navy's G-class of diesel/electric submarines were launched between 1914 and 1917, and intended for operations in the North Sea and German Bight in World War I against German U-boats.
The G-class submarines were designed by the Admiralty in response to a rumour that the Germans were building double-hulled submarines for overseas duties. The submarines had a partial double hull, a length of 187 feet 1 inch (57.0 m) overall, a beam of 22 feet 8 inches (6.9 m) and a mean draft of 13 feet 4 inches (4.1 m). They displaced 703 long tons (714 t) on the surface and 837 long tons (850 t) submerged. The G-class submarines had a crew of 30 officers and other ranks. However, the design offered little improvement in practice, the ships being notoriously slow to dive. Most of the class had their bows raised during the war to increase buoyancy and improve seakeeping.
For surface running, the boats were nearly all powered by two 800-brake-horsepower (597 kW) Vickers two-stroke eight-cylinder diesel engines, each driving one propeller shaft; G14 was initially powered by FIAT diesels, but these proved unsuccessful, and were replaced by the standard Vickers engines. It was originally intended to fit more efficient four-stroke MAN and Sulzer diesels to some of the class, but the outbreak of hostilities rendered such plans impossible. When submerged each propeller was driven by a 420-horsepower (313 kW) electric motor. They could reach 14.25 knots (26.39 km/h; 16.40 mph) on the surface and 9 knots (17 km/h; 10 mph) underwater. On the surface, the G class had a range of 2,400 nautical miles (4,400 km; 2,800 mi) at full speed.
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