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fighting ships of the world

ROYAL NAVY (UNITED KINGDOM)

COASTAL FORCES

Denny-built steam gun boats (1942)

SGB9 1943

Name No Yard No Builder Laid down Launched Comp Fate
SGB1     Thornycroft, Woolston --- --- --- cancelled 1941
SGB2     Thornycroft, Woolston --- --- --- cancelled 1941
SGB3, 1943 - Grey Seal S303 1874 Yarrow, Scotstoun 1/1941 28/9/1941 2/1942 sold 8/1949
SGB4, 1943 - Grey Fox S304 1875 Yarrow, Scotstoun 1/1941 25/9/1941 3/1942 sold 10/1947
SGB5, 1943 - Grey Owl S305 648 Hawthorn Leslie, Hebburn 4/1941 27/8/1941 4/1942 sold 12/1949
SGB6, 1943 - Grey Shark S306 646 Hawthorn Leslie, Hebburn 3/1941 17/11/1941 4/1942 sold 10/1947
SGB7 S309 1361 Denny, Dumbarton 2/1941 25/9/1941 3/1942 sunk 19/8/1942
SGB8, 1943 - Grey Wolf S308 1362 Denny, Dumbarton 2/1941 3/11/1941 4/1942 sold 2/1948
SGB9, 1943 - Grey Goose S307 6059 White, Cowes 1/1941 14/2/1942 7/1942 sold 12/1957

 

Displacement standard, t

175

Displacement full, t

255

Length, m

44.4

Breadth, m

7.11

Draught, m

1.40 deep load

No of shafts

2

Machinery

Metrovick geared steam turbines, 1 Foster Wheeler or Lamont boiler

Power, h. p.

7200 - 8000

Max speed, kts

34

Fuel, t

oil 50

Armament

2 x 1 - 40/39 2pdr QF Mk VIII, 2 x 2 - 12.7/62, 2 - 533 TT
Sensors type 286 radar

Complement

27

Ship project history: Steel round-bilge gunboats (actually MTBs), designed specially for operations against German S-boats in La Manche. As in Britain there were no diesels with enough power, it was necessary to apply steam turbine plant. It was supposed to built 60 SGBs, however only 9 were ordered, and 7 were built.

In 1942 1943 all have passed modernization in which course side abreast machinery was sheathed by 19mm armour plates and armament was considerably strengthened: 1 1 76mm gun, 1 1 40mm pompom (on part of boats) and 2 3 20mm Oerlikons were added. The crew has increased to 34 people, standard displacement reached 205t, speed was decreased to 30kts. All gunboats have received minelaying equipment for 8 10 mines and 2 DCs. In the second half of 1944 they again have passed update, this time for usage in a role of fast minesweepers. There was no any special minesweeping equipment: at the expense of large speed SGB had time to head out on safe distance from the blown up ground mine, and moored mines were not terrible thanks to a shallow draught.

Modernizations: 1943, all survived: machinery was protected by 19mm armour. Standard displacement rose up to 205t and maximal speed fell to 30kts at 1.73m draught; + 1 x 1 - 76/45 20cwt QF Mk I/II/III/IV, 1 x 1 - 40/51 QF Mk XIV, 3 x 1 - 20/70 Oerlikon Mk II/IV. Complement was 34.

late 1943, all survived: - 1 x 1 - 40/50, 1 x 1 - 40/39, 2x 2 - 12.7/62; + 2 x 1 - 57/43 6pdr 7cwt QF Mk II, 2 x 2 - 20/70 Oerlikon Mk II/IV, 2 DC or 8 - 10 mines

late 1944, all survived were converted to fast mine destructor vessels. Armament was 1 x 2 - 20/70 Oerlikon Mk II/IV, 2 x 1 - 20/70 Oerlikon Mk II/IV

(1952 - 1954), Grey Goose: was re-engined with gas turbines.

Naval service: SGB7 was lost 19/6/1942 in La Manche by unknown cause. Grey Goose was used in tests from 1952 and laid up in 1956. Planned SGB10 - 50 and SGB351 - 359 were never ordered.

SGB after war

Ivan Gogin, 2008-10