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FIGHTING SHIPS OF THE WORLD
UNITED KINGDOM
COASTAL FORCES
"CMB 40 ft" type motor torpedo boats (CMB1) (59, 1916 - 1920)


Photo



CMB.112 and CMB.98ED  

Ships


Names Builders Completed Losses Transfers Discarding

CMB.1, 2

CMB.3, 7.1918- DCB.3

CMB.4 - 8

CMB.9, 7.1918- DCB.2

CMB.10 - 12

CMB.13, 7.1918- DCB.2

CMB.40, 6.1918- Osea

CMB.41 - 61

CMB112

CMB121 - 123

DCB.4 (ex-MB.1143)

DCB.5 (ex-MB.1256)

Thornycroft, Hampton: CMB.1 - 10, 13, 40 - 42, 47 - 48, 50, 55 - 56, 112, 121 - 123

Tom Bunn, Rotherhithe: CMB.11, 12

Taylor & Bates, Chertsey: CMB.43, 49

J W Brooke, Lowestoft: CMB.44 - 45, 59

Frank Maynard, Chiswick: CMB.46, 53 - 54

Salter Bros, Oxford: CMB.51 - 52, 60 - 61

Wills & Packham, Sittingbourne: CMB.57 - 58

1916: CMB.1 - 13

1918: CMB.40 - 61, DCB.4, 5

1919: CMB.112

1921: CMB.121 - 123

CMB.1 (19.6.1917), CMB.2 (9.7.1918), CMB.5 (1922), CMB.8 (17.9.1917), CMB.10 (7.5.1918), CMB.11 (2.11.1917), Osea (11.8.1918), CMB.41 (1.8.1918, interned), CMB.42 (11.8.1918), CMB.44 (11.8.1918, interned), CMB.47 (11.8.1918), CMB.48 (11.8.1918, interned), CMB.50 (19.7.1918)

16 cancelled 11.1918. (presumably CMB.124 - 139)

Netherlands, 1928: CMB.123

1920: DCB.2, CMB.53, 60, DCB.4, 5

1921: DCB.3, CMB.4, 7, 45, 46, 51, 52, 54, 56 - 58, 61

1922: CMB.41, 43, 44, 48, 55

1925: CMB.6

1928: CMB.49, 59, 112

1929: CMB.121, 122

1935: DCB.1, CMB.12



Technical data


Displacement normal, t

5

Displacement full, t

 

Length, m

13.7

Breadth, m

2.59

Draught, m

0.82 - 0.92

No of shafts

1

Machinery

CMB.1 - 13: 1 Thornycroft V-8 or Thornycroft V-12 petrol engine

CMB.40 - 61: 1 FIAT petrol engine

CMB.112: 1 Thornycroft V-12 petrol engine

CMB.121 - 123: 1 Green 12-cyl. petrol engine

Power, h. p.

CMB.1 - 13: 250

CMB.40 - 61, 112, 121 - 123: 275

Max speed, kts

CMB.1 - 13: 24.8

CMB.40 - 61: 35.1

CMB.112: 37.3

CMB.121 - 123: 37.8

Fuel, t

petrol

Endurance, nm(kts) 
Armament

(1 - 2) x 2 - 7.7/94, 1 - 450 TT (stern)

Complement

2 - 3



Graphics


<i>CMB.112</i> and <i> CMB.98ED</i>  
CMB.112 and CMB.98ED  


Project history

Twelve were ordered in January 1916 and all were delivered by mid-August 1916, after Thornycroft had submitted designs based on pre-war hydroplanes. The hull was a stepped planing type and the torpedo was launched tail-first over the stern. The original specification called for CMBs (a camouflage designation) to be light enough for hoisting in light cruisers' davits, but only the 'scout' Diamond was used for this purpose.

Modernizations

None

Naval service

CMB.40 became a nominal depot ship and was renamed Osea in June 1918. A further 16 boats of the CMB.121 group were cancelled in November 1918. Five were converted to Distant Controlled Boats (DCBs), including two 40-footers not previously taken into naval service (MB.1143 and MB.1256, which became DCB.4 and DCB.5). The survivors were mostly sunk as targets or sold post-war, only CMB.12 lasting until 1935. CMB.4 was lent to the Imperial War Museum from 1921 to 1928 and then preserved at Hampton, and is now once again in IWM hands at Duxford.

CMB.98ED


Stunningly detailed and beautiful boat model by John Simpson: http://www.thornycroft40.co.uk/