NAVYPEDIA

Photo

Sturgeon 1933

Ships

Name	No	Yard No	Builder	Laid down	Launched	Comp	Fate
Sturgeon	S73 - N73		Chatham DYd	1.1931	8.1.1932	2.1933	to Netherlands 10.1943 - 9.1945 (Zeehond), BU 1.1946
Swordfish	S61		Chatham DYd	12.1930	10.11.1931	11.1932	sunk 11.1940
Seahorse	S98		Chatham DYd	9.1931	15.11.1932	10.1933	sunk 7.1.1940
Starfish	S19		Chatham DYd	9.1931	14.3.1933	10.1933	sunk 9.1.1940

Technical data

Max speed, kts, kn	13.75 / 10
Displacement standard, t	640
Displacement normal, t	730 / 927
Length, m	61.7
Breadth, m	7.32
Draught, m	3.63
No of shafts	2
Machinery	2 Admiralty diesels / 2 electric motors
Power, h. p.	1550 / 1440
Fuel, t	diesel oil 44
Endurance, nm(kts)	3800(10) /
Armament	Sturgeon, Swordfish: 1 x 1 - 76/45 20cwt QF Mk II (HA), 1 x 1 - 12.7/62, 6 - 533 TT (bow, 12), Seahorse, Starfish: 1 x 1 - 76/45 20cwt QF Mk II, 1 x 1 - 12.7/62, 6 - 533 TT (bow, 12),
Electronic equipment	type 120 sonar
Complement	38
Diving depth operational, m	60

Standard scale images

Graphics

Project history

In 1930, according to the plan of submarine forces modernization, Admiralty has made a decision to start building submarines for replacing of the outdated "Н" class. New boats should have medium dimensions, speed, armament and endurance, exceeding corresponding "Н" class indicators, but at the same time comparable with latter on manoeuvrability and a diving time. The design of new "S" class had approved the same year and building of 4 boats was started under 1929 and 1930 Programmes.

Submarines were saddle-tank type, with fuel tanks arranged inside pressure hull, designed diving depth was 95m. Diving time was 25-30sec. Swordfish and Sturgeon differed by original folding into special "well", 76mm gun mounting. Latter had appeared unsuccessful and was soon been replaced by standard not retracted one.

Modernizations

1942-1943, Sturgeon: + type 286W or type 291W radar

1/1946, Sturgeon: 1 x 1 - 76/45 CP Mk V, 6 - 533 TT, type 286W or type 291W radar, type 120 sonar

Naval service

Seahorse was lost on a mine in the North Sea (possibly 7.1.1940). Starfish was sunk 9.1.1940 by DCs of German minesweeper М7 in the North Sea. Swordfish was lost 16.11.1940 on a mine in the North Sea.