Ister-class frigate
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HMS Endymion rounding the Cape of Good Hope.
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| Class overview | |
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| Name: | Ister-class frigate |
| Builders: | Deptford Dockyard, Devonport Dockyard, Woolwich Dockyard |
| Operators: |
 Royal Navy
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| Preceded by: | Bristol class |
| Succeeded by: | None |
| Built: | 1860–66 |
| In service: | 1866–1885 |
| In commission: | 1866–1879 |
| Planned: | 5 |
| Completed: | 1 |
| Cancelled: | 4 |
| Scrapped: | 1 |
| General characteristics HMS Endymion | |
| Displacement: | 3,200 long tons (3,300 t) |
| Tons burthen: | 2486 |
| Length: | 240 ft (73.2 m) |
| Beam: | 48 ft (14.6 m) |
| Draught: | 18 ft 8 in (5.69 m) |
| Installed power: | 1,620 ihp (1,210 kW) |
| Propulsion: | 1 shaft, 1 Steam engine |
| Speed: | 12.5 knots (23.2 km/h; 14.4 mph) |
| Complement: | 450 |
| Armament: |
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The Ister-class frigates were a group of five 36-gun screw frigates ordered for the Royal Navy in the early 1860s. Four of the ships were cancelled after they were laid down and HMS Endymion was the only ship completed.
Endymion was 240 feet (73.2 m) long, with a beam of 48 feet (14.6 m), and a draught of 18 feet 8 inches (5.69 m). She was assessed as 2,486 tons Builder's Old Measurement and displaced 3,200 tons. She was fitted with 36 guns and had a complement of 450. Propulsion was by a 500 nhp steam engine, which was built by Napier & Sons, Glasgow. The engine drove a single screw propeller of 18 feet (5.49 m) diameter and 21 feet (6.40 m) pitch. The propeller was 3 feet 6 inches (1.07 m) long, and the tips of the blades were 7 feet 6 inches (2.29 m) beneath the surface of the water.
She was designed to take 36 guns, which were intended to comprise four 100 pounder, rifled muzzle-loading guns (weight 125 Cwt/6,350 kg each), fourteen 8-inch guns (65 Cwt/3,302 kg each), located on the maindeck; and nine 110-pounder breech-loading guns (82 Cwt/6,166 kg each) located on the upper deck. In August, it was reported that Endymion was then being fitted with three 110-pounder Armstrong guns, four 100-pounder Somerset guns and fourteen 8-inch guns.
All five of the ships in the class were laid down in 1860–61 in various royal dockyards, but HMS Blonde and HMS Astrea were cancelled on 12 December 1863. HMS Dartmouth and HMS Ister were cancelled a year later, on 16 December 1864. None of these four ships were launched before they were cancelled.
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