History
Canada
Name	Thunder
Namesake	Thunder Bay
Builder	Canadian Vickers Ltd., Montreal
Laid down	17 May 1951
Launched	17 July 1952
Commissioned	15 December 1953
Decommissioned	31 March 1954
Identification	MCB 153
Honours and awards	Atlantic 1941–44, Normandy 1944, English Channel 1944–45[1]
Fate	Sold to France as La Paimpolaise
Badge	Gules, a pile vert edged or, charged with a representation of the head of Thor, God of thunderstorms, affrontée, wearing a Nordic open crown composed of a circlet with eight arches all plain and meeting together in a point at the pinnacle, his beard formed into nine radiating coils each tapering to a point with a small spearhead at the end[1]
France
Name	La Paimpolaise
Acquired	31 March 1954
Commissioned	21 May 1954
Decommissioned	31 January 1987
Stricken	1987
Identification	P 657
General characteristics
Class and type	Bay-class minesweeper
Displacement	390 tons (412 tons deep load)
Length	152 ft (46 m)
Beam	28 ft (8.5 m)
Draught	8 ft (2.4 m)
Propulsion	2 shafts, 2 GM 12-cylinder diesels, 2,400 bhp (1,800 kW)
Speed	16 knots (30 km/h; 18 mph)
Range	3,290 nmi (6,090 km; 3,790 mi) at 12 kn (22 km/h; 14 mph)
Complement	38
Armament	1 × 40 mm Bofors gun

HMCS Thunder (hull number MCB 153) was a Bay-class minesweeper that served in the Royal Canadian Navy for three and a half months in 1954 before being sold to the French Navy to become La Paimpolaise. The ship was named for Thunder Bay and was the second vessel to carry the name. Her name was given to her replacement, HMCS Thunder (MCB 161).

The Bay class were designed and ordered as replacements for the Second World War-era minesweepers that the Royal Canadian Navy operated at the time. Similar to the Ton-class minesweeper, they were constructed of wood planking and aluminum framing.^[2][3]

Displacing 390 long tons (400 t) standard at 412 long tons (419 t) at deep load, the minesweepers were 152 ft (46 m) long with a beam of 28 ft (8.5 m) and a draught of 8 ft (2.4 m).^[2][3] They had a complement of 38 officers and ratings.^{[2][note 1]}

The Bay-class minesweepers were powered by two GM 12-cylinder diesel engines driving two shafts creating 2,400 brake horsepower (1,800 kW). This gave the ships a maximum speed of 16 knots (30 km/h; 18 mph) and a range of 3,290 nautical miles (6,090 km; 3,790 mi) at 12 knots (22 km/h; 14 mph).^[3][4] The ships were armed with one 40 mm Bofors gun and were equipped with minesweeping gear.^[2][3]

Thunder's keel was laid down on 17 May 1951 by Canadian Vickers at their yard in Montreal, Quebec. The minesweeper was launched on 17 July 1952. The vessel was commissioned into the Royal Canadian Navy on 15 December 1953 with the hull identification number 144.^[5]

After commissioning spent three months in service with the Royal Canadian Navy. The minesweeper was paid off on 31 March 1954. She was transferred to France the same day, but the French flag was only raised aboard the ship on 1 April. The minesweeper was commissioned on 21 May 1954 and renamed La Paimpolaise.^[5][6] She served as a minesweeper until 1973 when the minesweeping gear was removed and she transferred to the Pacific for duty as an overseas territories patrol vessel.^[6] She was paid off 31 January 1987 and stricken later that year.^[7]

• Arbuckle, J. Graeme (1987). Badges of the Canadian Navy. Halifax, Nova Scotia: Nimbus Publishing. ISBN 0-920852-49-1.
• 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.
• Gardiner, Robert; Chumbley, Stephen; Budzbon, Przemysław, eds. (1995). Conway's All the World's Fighting Ships 1947–1995. Annapolis, Maryland: Naval Institute Press. ISBN 1-55750-132-7.
• Macpherson, Ken; Barrie, Ron (2002). The Ships of Canada's Naval Forces 1910–2002 (Third ed.). St. Catharines, Ontario: Vanwell Publishing. ISBN 1-55125-072-1.
• Moore, John, ed. (1981). Jane's Fighting Ships, 1981–1982. New York: Jane's Information Group. ISBN 0-531-03977-3.