| Career | |
|---|---|
| Name: | H21 |
| Builder: | Vickers Limited, Barrow-in-Furness |
| Laid down: | 20 October 1917 |
| Commissioned: | 28 January 1918 |
| Fate: | Sold, 13 July 1926 |
| General characteristics | |
| Class and type: | H class submarine |
| Displacement: | 423 long tons (430 t) surfaced 510 long tons (518 t) submerged |
| Length: | 171 ft 0 in (52.12 m) |
| Beam: | 15 ft 4 in (4.67 m) |
| Propulsion: | 1 × 480 hp (358 kW) diesel engine 2 × 620 hp (462 kW) electric motors |
| Speed: | 11.5 knots (21.3 km/h; 13.2 mph) surfaced 9 knots (17 km/h; 10 mph) submerged |
| Range: | 2,985 nmi (5,528 km) at 7.5 kn (13.9 km/h; 8.6 mph) surfaced 130 nmi (240 km) at 2 kn (3.7 km/h; 2.3 mph) submerged |
| Complement: | 22 |
| Armament: | • 4 × 21 in (533 mm) bow torpedo tubes • 8 × 21 inch torpedoes |
HMS H21 was a British H class submarine built by Vickers Limited, Barrow-in-Furness, as the first of the Batch 3 H class submarines. She was laid down on 20 October 1917 and was commissioned on 28 January 1918.
H21 was an improved design of the H class which produced a larger displacement and the latest 21 inch torpedo tubes replacing the old 18 inch torpedo tubes. This would be incorporated into all batch 3 H class submarines.
HMS H21 was sold on 13 July 1926 at Newport.
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