ST Empire Ace

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Name: Empire Ace (1942-47)
Diligent (1947-61)
Empire Ace (1961-71)
Owner: Ministry of War Transport (1942-47)
Admiralty (1947-61)
Ministry of Defence (1961-71)
Operator: Owner operated except:- US Navy (1961-64)
Port of registry: United Kingdom Goole (1942-47)
United Kingdom London (1947-71)
Builder: Cochrane & Sons Ltd, Selby
Yard number: 1255
Launched: 19 September 1942
Completed: 22 December 1942
Out of service: 11 November 1968
Identification: Official Number 169078
Code Letters MFLY (1942-47)
Fate: Scrapped 1971
General characteristics
Tonnage: 275 GRT
Length: 105 feet 2 inches (32.05 m)
Beam: 26 feet 6 inches (8.08 m)
Draught: 12 feet 2 inches (3.71 m)
Propulsion: 1 x triple expansion steam engine (Amos & Smith Ltd, Hull) 132 horsepower (98 kW)

Empire Ace was a 275 ton tug which was built in 1942 for the Ministry of War Transport (MoWT). She was transferred to the Admiralty in 1947 and renamed Diligent. She was transferred to the Ministry of Defence in 1961 and reverted to Empire Ace. She ran aground in 1968 and was scrapped in 1971.


Empire Ace was built by Cochrane & Sons Ltd, Selby as yard number 1255. She was launched on 12 September 1943[1] and completed on 22 December 1943. [2] She was built for the MoWT. Empire Ace was sent to Malta[1] She was a member of Convoy KMS 25 which passed Gibraltar on 19 September 1943. She had sailed from Algiers with an unrecoded destination,[3] but likely to have been Malta. Empire Ace was sunk during an air raid on Malta on 15 March 1944. On the 10 May she was salvaged and repairs were carried out. In 1947 she was transferred to the Admiralty and renamed Diligence. In 1961, Diligence was transferred to the Ministry of Defence and reverted back to Empire Ace. She was loaned to the US Navy from December 1961 to December 1964, serving in Scotland. On 11 November 1968, she ran aground at Campbeltown in heavy seas and was abandoned. Empire Ace was refloated in June 1969 but declared a constructive total loss. She was scrapped at Campbelltown in 1971[1] by well known local scrap company Bitey and Cougar Ltd.[citation needed]

Official number and code letters

Official Numbers were a forerunner to IMO Numbers.

Empire Ace had the UK Official Number 1690781 and used the Code Letters MFLY.[4]


  1. 1.0 1.1 1.2 Mitchell, W H, and Sawyer, L A (1995). The Empire Ships. London, New York, Hamburg, Hong Kong: Lloyd's of London Press Ltd. pp. p309–10. ISBN 1-85044-275-4. 
  2. ""1169078"" (subscription required). Miramar Ship Index. R.B. Haworth. Retrieved 1 February 2009. 
  3. "KMS Convoys – 1942-1945, KMS 1 through KMS 30". Warsailors. Retrieved 1 February 2009. 
  4. "LLOYDS REGISTER, STEAMERS & MOTORSHIPS UNDER 300 TONS, TRAWLERS &c.". Plimsoll Ship Data. Retrieved 1 February 2008.