Trad-class torpedo boat

HTMS Chumpohn preserved as a museum ship
Class overview
Name	Trad-class torpedo boat
Builders	Cantieri Riuniti dell'Adriatico, Monfalcone
Operators	Royal Thai Navy
Preceded by	Number 1 class
Succeeded by	Kantang class
Built	1934–1938
In commission	1935–1977
Completed	9
Lost	2
Retired	7
Preserved	1
General characteristics
Type	Torpedo boat
Displacement	318 long tons (323 t) standard
Length	67.97 m (223 ft 0 in) o/a
Beam	6.4 m (21 ft 0 in)
Draught	2.13 m (7 ft 0 in)
Installed power	9,000 shp (6,700 kW)
Propulsion	Geared Steam turbines 2 shafts
Speed	31 knots (57 km/h; 36 mph)
Armament	3 × 76 mm (3 in) guns 2 × 20 mm (0.8 in) cannon 4 × 8 mm (0.31 in) machine guns 6 × 450 mm (18 in) torpedo tubes

The Trad class was a class of nine torpedo boats built for the Royal Thai Navy in the 1930s by the Italian shipbuilder Cantieri Riuniti dell'Adriatico. They entered service between 1935 and 1938. Two of the ships were sunk (and a third badly damaged by French warships at the Battle of Ko Chang in 1941, but the remaining seven ships had long careers, remaining in service until the 1970s.

Construction and design

In 1934, the Royal Thai Navy launched a major re-equipment programme, with orders split between Italy and Japan. In 1934, Thailand ordered nine torpedo boats (the Trad class) and two minelayers from the Italian shipyard Cantieri Riuniti dell'Adriatico (CRDA), with two coast defence ships (the Thonburi class, three small torpedo boats (the Kantan class), two sloops and four submarines ordered from Japan in 1935.[1][2]

The Italian design resembled a smaller version of the Spica-class torpedo boats building for the Italian Navy. They were 67.97 metres (223 ft 0 in) long overall and 66.75 m (219 ft 0 in) between perpendiculars, with a beam of 6.4 m (21 ft 0 in) and a mean draught of 2.13 m (7 ft 0 in). Displacement was 318 long tons (323 t) standard and 470 long tons (480 t) full load.[1] Two Yarrow boilers supplied steam for two sets of Parsons geared steam turbines, which drove two propeller shafts. The machinery was rated at 9,000 shaft horsepower (6,700 kW), giving a contract speed of 31 knots (57 km/h; 36 mph), with Trad reaching a speed of 32.54 kn (60.26 km/h; 37.45 mph) at 10,000 shp (7,500 kW) during sea trials.[1][3] 102 long tons (104 t) of oil was carried, giving a range of 1,700 nautical miles (3,100 km; 2,000 mi) at 15 knots (28 km/h; 17 mph).[1]

The ship's main armament was supplied by Vickers-Armstrongs, to be compatible with existing British-built ships in the Thai Navy. Three 76 mm (3 in) anti-aircraft guns were carried, backed up by a close-in armament of two 20 mm (0.8 in) cannon and four machine guns. Six 457 mm (18 in) torpedo tubes were fitted, with two twin mounts on the ships' centerlines and two single tubes mounted forward at the break of the forecastle. Crew was 70 officers and other ranks.[1] By 1971, the surviving ships' armament had been revised, with one of the 76 mm guns and the two single torpedo tubes removed from all of the class, and one of the twin torpedo tube mounts removed from Trad, Phuket and Chumporn. This allowed the addition of one or two 40 mm (1.6 in) Bofors guns.[4]

The ships were built at CRDA's Monfalcone shipyard, with the first two launched in 1935, with four more following in 1936 and the remaining three in 1937.[1][3][2]

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Service

The first two ships (Trad and Phuket) arrived in Bangkok on 19 April 1936, with the next two (Pattani and Surasdra) reaching Thailand by the end of the year, and the remaining five commissioning in Italy in March 1937.[3] In January 1941, Thailand attacked French Indochina in the Franco-Thai War.[5] As a response to the Thai successes on land, on 17 January 1941 a French Navy force, consisting of the cruiser Lamotte-Picquet and four sloops, attacked a Thai force including the coast defence ship Thonburi together with three Trad-class torpedo boats, Trad, Cholburi and Songkla in the Battle of Ko Chang.[6] Thonburi, Cholburi and Songkla were sunk, while Trad was badly damaged.[1] The remaining ships stayed in service until the 1970s, with the last ship retiring in 1977. The Chumpohn would later become a museum ship and can be visited today while the Pattani and Surat were sunk as targets.

The wrecks of the Chonburi and Songkhla have been discovered, surveyed, and documented by the Royal Thai Navy but the documentary released is poor and does not show the state of the wrecks beyond that they are intact. [1]

Ships

Note: Construction and delivery dates vary between sources.

Construction data

Name	Pennant no.[1]	Laid down[1]	Launched	Commissioned	Fate[1]
HTMS Trad	11	9 February 1934	26 October 1935[2][7][8][a]	19 April 1936[3]	Sunk as target ship by Gabriel launches from HTMS Harn Hak Satru and HTMS Prab Porapak, with guns installed as saluting guns at Wichaiprasit fortress
HTMS Phuket	12	7 January 1934	28 September 1935[2][7][8][b]	19 April 1936[3]	Scrapped with guns installed as saluting guns at Wichaiprasit fortress
HTMS Pattani	13	31 March 1935	16 October 1936[2][7][8][c]	Late 1936[3]	Sunk as a target ship for the first Thai EXOCET missile launch from HTMS Wittayakom
HTMS Surasdra	21	31 March 1935	28 November 1936[2][7][8][d]	Late 1936[3]	Sunk as target ship by HTMS Bangpakong using a C-801 anti ship missile on the 7th of July 1994
HTMS Chandaburi	22	6 June 1936	16 December 1936[7][8][e]	March 1937[3]	Scrapped
HTMS Rayong	23	6 June 1936	11 January 1937[2][3][8][f]	March 1937[3]	Scrapped
HTMS Chumpohn	31	7 July 1936	18 January 1937[2][3][8][g]	March 1937[3]	Turned into a museum ship
HTMS Chonburi	32	22 August 1936	10 February 1937[3][h]	March 1937[3]	Sunk 17 January 1941 at the battle of Koh Chang
HTMS Songkla	33	29 August 1936	9 February 1937[3][i]	March 1937[3]	Sunk 17 January 1941 at the battle of Koh Chang

Notes

1. 29 September 1935 according to Whitley.[1]
2. 26 October 1935 according to Whitley.[1]
3. 28 November 1936 according to Whitley.[1]
4. 14 November 1936 according to Whitley.[1]
5. 28 November 1936 according to Whitley,[1] 18 January 1937 according to Conways.[2]
6. 16 December 1936 according to Whitley.[1]
7. 12 January 1937 according to Whitley.[1]
8. 18 January 1937 according to Whitley.[1]
9. 10 February 1937 according to Whitley.[1]

Citations

1. Whitley 2000, p. 227
2. Gardiner & Chesneau 1980, p. 410
3. Fock 1989, p. 232
4. Blackman 1971, p. 312
5. Dear & Foot 1995, p. 1107
6. Rohwer & Hümmelchen 1992, p. 48
7. Fock 1989, p. 231
8. Blackman 1953, p. 354

References

• Blackman, Raymond V. B., ed. (1953). Jane's Fighting Ships 1953–54. New York: McGraw-Hill Book Company Inc.
• Blackman, Raymond V. B., ed. (1971). Jane's Fighting Ships 1971–72. London: Sampson Low Marston & Co., Ltd. ISBN 0-354-00096-9.
• Dear, I. C. B.; Foot, M. R. D., eds. (1995). "Thailand". The Oxford Companion to World War II. New York: Oxford University Press. pp. 1106–1107. ISBN 0-19-866225-4.
• Fock, Harald (1989). Z-Vor!: Internationale Entwicklung und Kriegseinsätze von Zerstörern und Torpedobooten: 1914 bis 1939. Herford, Germany: Koelers Verlagsgesellschaft mbH. ISBN 3-7822-0207-4.
• Gardiner, Robert; Chesneau, Roger, eds. (1980). Conway's All The World's Fighting Ships 1922–1946. London: Conway Maritime Press. ISBN 0-85177-146-7.
• Rohwer, Jürgen; Hümmelchen, Gerhard (1992). Chronology of the War at Sea 1939–1945. London: Greenhill Books. ISBN 1-85367-117-7.
• Whitley, Michael (2000). Destroyers of World War Two: An International Encyclopedia. London: Cassell & Co. ISBN 1-85409-521-8.