NAVYPEDIA

Photo

P-3

Ships

Name	No	Yard No	Builder	Laid down	Launched	Comp	Fate
П-1 [P-1] (ex-Правда [Pravda])		218	189 Yd (Ordzhonikidze Yd), Leningrad	5.1931	3.1.1934	6.1936	sunk 9-17.9.1941
П-2 [P-2] (ex-Звезда [Zvezda]), 6.1949- Б-31 [B-31]		219	189 Yd (Ordzhonikidze Yd), Leningrad	12.1931	15.4.1935	7.1936	test ship 8.1944, TS 9.1951, hulk 8.1955
П-3 [P-3] (ex-Искра [Iskra]), 6.1949- Б-1 [B-1]		220	189 Yd (Ordzhonikidze Yd), Leningrad	12.1931	4.12.1934	7.1936	stricken 6.1952

Technical data

Displacement standard, t
Displacement normal, t	955 / 1690
Length, m	87.7
Breadth, m	8.00
Draught, m	2.91
No of shafts	2
Machinery	2 MAN M10V49/48 diesels / 2 PP84/95 electric motors
Power, h. p.	5400 / 1100
Max speed, kts	18.8 / 6.5
Fuel, t	diesel oil 92
Endurance, nm(kts)	5660(15.3) / 60(3.2)
Armament	2 x 1 - 100/49 B-24, 1 x 1 - 45/43 21K, 6 - 533 TT (4 bow, 2 stern, 10)
Electronic equipment	Merkuriy or Mars-A or Mars-DM or Mars-ShM hydrophone
Complement	56
Diving depth operational, m	50

Standard scale images

Graphics

Project history

Fleet submarines, intended for servcie with the surface fleet, attacks on landing forces as self-supporting, and in interaction with other submarines or coastal forces. The design assignment was given out in 1930. Priority was returned to surface speed, corresponding to cruising speed of battleships, and armament. The demand of minimum draught was thus made, the high freeboard became corollary of that.     Boats had double-hulled construction with external arrangement of pressure hull frames (for the first time in Russian practice). Light hull differed by characteristic "hump" amidships, creating sinking moment in submerged position. On trials big diving time, shallow diving depth (no more than 70m), a surface speed shortage and bad controllability in submerged position have come to light. Besides, because of unsuccessful construction of cutwaters of bow TTs, after commission of boats it was necessary to shorten fore end that has led to decrease of speed on 0.8kts. All it together brought battle value of IV series submarines to a minimum, and continuation of their building have refused.

Modernizations

1939, all: CT was rebuilt

1940-1942, all survived: - hydrophone; + Mars-16 hydrophone

Naval service

In days of war they were used as transport and training submarines. P-1 was lost 10-11.9.1941 in Gulf of Finland, possibly on a mine.