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Acheron in New Zealand
Class overview
Name	Hermes-class paddle sloop
Builders	Portsmouth Dockyard Sheerness Dockyard
Operators	Royal Navy
Preceded by	HMS Medea
Succeeded by	HMS Gorgon
Built	1834–1839
In commission	1835–1864
Completed	4
Lost	1
Retired	3
General characteristics
Type	Paddle sloop
Displacement	1,006 tons
Tons burthen	715+43⁄94 bm
Length	150 ft 0 in (45.7 m) gundeck 128 ft 0 in (39.0 m) keel for tonnage
Beam	32 ft 9 in (10.0 m) maximum 32 ft 5 in (9.9 m) for tonnage
Draught	11 ft 6 in (3.5 m) (forward) 12 ft 0 in (3.7 m) (aft)
Depth of hold	17 ft 0 in (5.2 m)
Installed power	140 nominal horsepower (160 in Acheron)
Propulsion	2-cylinder side lever steam engine Paddles
Sail plan	3-masted barque rigged
Complement	135
Armament	As built: 2 × 9-pounder (13 1⁄2 cwt) brass guns From 1842: 1 × 8-inch (52 cwt) pivot gun 2 × 32-pounder (17 cwt) carronades

The Hermes class were a group of four vessels designed by John Edye of the Surveyor's Department to specifications outlined by Captain William Symonds, the Surveyor of the Navy. The design was approved in 1834. The vessels would be powered by a 140 nominal horsepower engine and carry an armament of two brass 9-pounder guns. The ships would be built in three Royal Dockyards (Portsmouth, Chatham and Sheerness), however, the Chatham vessel was transferred to Sheerness in 1837 prior to being laid down. Hermes was re-engined and lengthen in 1842, Megaera was wrecked in Jamaica in 1843. the remaining vessels served on many different stations of the Empire. Acheron was sold in 1855, Hermes went to the Breakers in 1864 and Volcano lasted until 1894.

Acheron was the second named vessel since it was used for an 8-gun Bomb, purchased in October 1803 then captured by the French in the Mediterranean and burnt on 3 February 1805.

Hermes was the sixth named vessel since it was used for a 12-gun brig sloop, captured from the Dutch (Mercurius) by Sylph at Texel on 12 May 1596 and foundered in January 1797.

Megaera was the second named vessel since it was used for a 14-gun Fireship, launched by Teague of Ipswich in May 1783 and sold to J. Darkin on 3 April 1817.

Volcano was the sixth named vessel since it was used for an 8-gun Fireship, purchased 1778, commissioned 31 July 1778 and sold 7 May 1781.

Design and specifications

The first three vessels were ordered in 1834 with last one in 1837. the ships were laid down at the rate of one per year between 1834 and 1837 with first pair at Portsmouth and the second pair at Sheerness. The first was launched in 1835 and the last in 1838. The gundeck was 150 feet 0 inches (45.72 metres) with the keel length of 125 feet 0 inches (38.10 metres) reported for tonnage. The maximum beam was 32 feet 9 inches (9.98 metres) with 32 feet 5 inches (9.88 metres) reported for tonnage. The depth of hold was 17 feet 0 inches (5.18 metres). The light draught forward was 11 feet 6 inches (3.51 metres) and 12 feet 0 inches (3.66 metres) aft. The builder's measure was calculated at 715 43/94 tons whereas the vessels displaced 1,006 tons.

In 1842 Hermes underwent an engine change. During that process her hull was lengthened. Upon completion her gundeck was now 170 feet 0 inches (51.82 metres) with 148 feet 1.25 inches (45.14 metres) for keel reported for tonnage. Her breadth remained at 32 feet 9 inches (9.98 metres) at maximum with 32 feet 5 inches (9.88 metres) reported for tonnage. Her depth of hold increased to 18 feet 2 inches (5.54 metres) with her builder's measured tonnage calculated at 827 88/94 tons.

The machinery for Acheron, Volcano and Megaera was supplied by Seaward and Capel and Hermes was supplied by the Butterley Company of Derbyshire. All vessels were equipped with two fire-tube rectangular boilers. All engines were basically 2-cylinder vertical single expansion (VSE) side-lever steam engines rated at 140 nominal horsepower (NHP) except Acheron which was rated at 160 NHP. Hermes was originally fitted with Morgan's paddle wheels from the original Hermes of 1830. In 1838 she was fitted with cycloidal paddle wheels. Hermes had her original engine removed at Woolwich in 1840, and after which she was lengthened, in 1843 a new Maudslay 220 nominal horsepower 'Siamese'-type steam engine was fitted. This gave her a speed under power of about 8+1⁄2 knots (15.7 km/h). Pictures show Acheron with a barque rig.

All four ships were initially armed with two 9-pounder (13 1/2 hundredweight (cwt)) (muzzle-loading smooth bore MLSB) brass guns. Between 1842 and 1843 they were re-armed with one 8-inch 52 cwt muzzle loading shell gun on a pivot mount and two 32-pounder (17 cwt) carronades. They had a complement of approximately 135 men.

Initial cost of vessels

• Acheron: Total Cost £25,509 (Hull - £16,819; Machinery - £8,690)
• Hermes: Total Cost £24,452
• Megaera Total Cost: £27,778 (Hull - £15,161; machinery - £8,983; fitting - £3,634)
• Volcano Total Cost: £27,884 (hull - £17,011; machinery - £8,875; fitting - £1,867)

Ships

Notes

1. "cwt", or "hundredweight" refers to the weight of the gun itself. "32-pounder" refers to the weight of the ball fired
2. A total cost accounting for inflation of approximately £2,901,100 in today's money for Acheron.
3. A total cost accounting for inflation of approximately £2,780,900 in today's money for Hermes.
4. A total cost accounting for inflation of approximately £3,159,200 in today's money for Magaera.
5. A total cost accounting for inflation of approximately £3,171,200 in today's money for Volcano.

Citations

1. Colledge, Acheron
2. Colledge, Hermes
3. Colledge, Megaera
4. Colledge, Volcano
5. Lyon Winfield, page 158
6. Winfield
7. Winfield
8. Winfield
9. Lyon Winfield, page 158
10. Lyon Winfield, page 158
11. Lyon Winfield, page 158
12. Lyon Winfield, page 158
13. Winfield

References

• Lyon Winfield, The Sail & Steam Navy List, All the Ships of the Royal Navy 1815 to 1889, by David Lyon & Rif Winfield, published by Chatham Publishing, London © 2004, ISBN 1-86176-032-9
• Winfield, British Warships in the Age of Sail (1817 – 1863), by Rif Winfield, published by Seaforth Publishing, England © 2014, eISBN 9781473837430, Chapter 11 Steam Paddle Vessels, Vessels acquired since November 1830, Hermes Class
• Colledge, Ships of the Royal Navy, by J.J. Colledge, revised and updated by Lt Cdr Ben Warlow and Steve Bush, published by Seaforth Publishing, Barnsley, Great Britain, © 2020, e ISBN 978-1-5267-9328-7 (EPUB)
• The Navy List, published by His Majesty's Stationery Office, London

• Paddle sloops of the Royal Navy
• Sloop classes