HMS Hyperion (H97)
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| History | |
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 United Kingdom
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| Name: | HMS Hyperion |
| Builder: | Swan Hunter, Tyne and Wear, United Kingdom |
| Laid down: | 27 March 1935 |
| Launched: | 8 April 1936 |
| Completed: | 3 December 1936 |
| Identification: | pennant number: H97 |
| Fate: | Mined 22 December 1940 |
| General characteristics as built | |
| Class and type: | H-class destroyer |
| Displacement: | |
| Length: | 323 ft (98.5 m) |
| Beam: | 33 ft (10.1 m) |
| Draught: | 12 ft 5 in (3.8 m) |
| Installed power: | 34,000 shp (25,000 kW) |
| Propulsion: |
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| Speed: | 36 knots (67 km/h; 41 mph) |
| Range: | 5,530 nmi (10,240 km; 6,360 mi) at 15 knots (28 km/h; 17 mph) |
| Complement: | 137 (peacetime), 146 (wartime) |
| Sensors and processing systems: |
ASDIC |
| Armament: |
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| Notes: | Pennant number H97 |
HMS Hyperion was an H-class destroyer built for the Royal Navy during the mid-1930s. During the Spanish Civil War of 1936–1939 the ship enforced the arms blockade imposed by Britain and France on both sides as part of the Mediterranean Fleet. During the first few months of World War II, Hyperion searched for German commerce raiders in the Atlantic Ocean and blockaded German merchant ships in neutral harbours until she returned to the British Isles in early 1940. The ship participated in the Norwegian Campaign before she was transferred back to the Mediterranean Fleet shortly afterwards. Hyperion participated in the Battle of Calabria and the Battle of Cape Spada in July 1940 while escorting the larger ships of the fleet. The ship covered several convoys to Malta before she struck a mine and had to be sunk in December 1940.
Hyperion displaced 1,350 long tons (1,370 t) at standard load and 1,883 long tons (1,913 t) at deep load. The ship had an overall length of 323 feet (98.5 m), a beam of 33 feet (10.1 m) and a draught of 12 feet 5 inches (3.8 m).
She was powered by Parsons geared steam turbines, driving two shafts, which developed a total of 34,000 shaft horsepower (25,000 kW) and gave a maximum speed of 36 knots (67 km/h; 41 mph). The other G- and H-class destroyers were built with three Admiralty 3-drum water-tube boilers, but as a trial Hyperion uniquely used a Johnson boiler in the aft position instead. This is an O-type boiler with a single lower water drum and curved tubes, rather than the triangular arrangement with two drums used by the Admiralty. The first boiler design suffered from poor circulation and so external cold downcomers were added, making the reworked boiler 10% heavier. The boiler was well-regarded in service as it reduced the amount of potentially troublesome refractory firebrick usually used for the base of the furnace.
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