HMS Spearhead

HMS Spearhead
History
United Kingdom
Name	HMS Spearhead
Builder	Cammell Laird & Co Limited, Birkenhead
Laid down	18 August 1943
Launched	2 October 1944
Commissioned	21 December 1944
Fate	Sold to the Portuguese Navy in 1948 and renamed NRP Neptuno
Badge
Portugal
Name	NRP Neptuno
Acquired	August 1948
Fate	Scrapped, 1967
General characteristics
Class and type	S-class submarine
Displacement	814 long tons (827 t) surfaced 990 long tons (1,010 t) submerged
Length	217 ft (66.1 m)
Beam	23 ft 9 in (7.2 m)
Draught	14 ft 1 in (4.3 m)
Installed power	1,900 bhp (1,400 kW) (diesel) 1,300 hp (970 kW) (electric)
Propulsion	2 × diesel engines 2 × electric motors
Speed	14.75 knots (27.32 km/h; 16.97 mph) surfaced 9 knots (17 km/h; 10 mph) submerged
Range	7,500 nmi (13,900 km; 8,600 mi) at 10 knots (19 km/h; 12 mph) surface; 120 nmi (220 km; 140 mi) at 3 knots (5.6 km/h; 3.5 mph) submerged
Test depth	350 feet (106.7 m)
Complement	48
Armament	6 × bow 21 in (533 mm) torpedo tubes 1 × 4-inch (102 mm) deck gun

HMS Spearhead was a S-class submarine of the third batch built for the Royal Navy during World War II. She survived the war and was sold to Portugal. She was scrapped in 1967.

Design and description

The last 17 boats of the third batch were significantly modified from the earlier boats. They had a stronger hull, carried more fuel and their armament was revised. The submarines had a length of 217 feet (66.1 m) overall, a beam of 23 feet 9 inches (7.2 m) and a draft of 14 feet 1 inch (4.3 m). They displaced 814 long tons (827 t) on the surface and 990 long tons (1,010 t) submerged.^[1] The S-class submarines had a crew of 48 officers and ratings. They had a diving depth of 350 feet (106.7 m).^[2]

For surface running, the boats were powered by two 950-brake-horsepower (708 kW) diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 650-horsepower (485 kW) electric motor.^[3] They could reach 14.75 knots (27.32 km/h; 16.97 mph) on the surface and 9 knots (17 km/h; 10 mph) underwater.^[1] On the surface, the third batch boats had a range of 7,500 nautical miles (13,900 km; 8,600 mi) at 10 knots (19 km/h; 12 mph) and 120 nmi (220 km; 140 mi) at 3 knots (5.6 km/h; 3.5 mph) submerged.^[2]

Spearhead was armed with six 21 inch (533 mm) torpedo tubes in the bow. She carried six reload torpedoes for a grand total of a dozen torpedoes. Twelve mines could be carried in lieu of the torpedoes. The boat was also equipped with a 4-inch (102 mm) deck gun.^[1]

Construction and career

HMS Spearhead was laid down at Cammell Laird's Birkenhead shipyard on 18 August 1943, was launched on 2 October 1944 and completed on 21 December 1944.^[4] So far she has been the only ship of the Royal Navy to bear the name Spearhead.^[5] Spearhead survived the Second World War and was sold to the Portuguese in August 1948 and renamed NRP Neptuno.

Notes

1. Chesneau, p. 52
2. McCartney, p. 7
3. Bagnasco, p. 110
4. Blackman 1962, p. 200
5. HMS Spearhead, Uboat.net

References

• Akermann, Paul (2002). Encyclopaedia of British Submarines 1901–1955 (reprint of the 1989 ed.). Penzance, Cornwall: Periscope Publishing. ISBN 1-904381-05-7.
• Bagnasco, Erminio (1977). Submarines of World War Two. Annapolis, Maryland: Naval Institute Press. ISBN 0-87021-962-6.
• Blackman, Raymond V. B. (1962). Jane's Fighting Ships 1962–63. London: Sampson Low, Marston & Co., Ltd.
• Chesneau, Roger, ed. (1980). Conway's All the World's Fighting Ships 1922–1946. Greenwich, UK: Conway Maritime Press. ISBN 0-85177-146-7.
• Colledge, J. J.; Warlow, Ben (2006) [1969]. Ships of the Royal Navy: The Complete Record of all Fighting Ships of the Royal Navy (Rev. ed.). London: Chatham Publishing. ISBN 978-1-86176-281-8.
• McCartney, Innes (2006). British Submarines 1939–1945. New Vanguard. Vol. 129. Oxford, UK: Osprey. ISBN 1-84603-007-2.