A cruiser submarine is a very large submarine designed to remain at sea for extended periods in areas distant from base facilities. Cruiser submarines were successful for a brief period of World War I; but were less successful than smaller submarines during World War II. Large submarines remained vulnerable to damage from Defensively equipped merchant ships (DEMS), were slow to dive if found by aircraft, offered a large sonar echo surface, and were less able to defensively maneuver during depth charge attacks.
The cruiser submarine concept originated during the unrestricted submarine warfare campaign of 1917. Three German Type U 139 submarines and seven former merchant submarines, each armed with two 15-centimetre (5.9 in) guns, patrolled areas distant from their North Sea bases to sink Allied merchant shipping as part of an effort to end World War I by starving the United Kingdom of Great Britain and Ireland. These distant patrols enjoyed unique immunity to the defensive convoy measures which limited successful submarine attacks in the vicinity of the British Isles.
The first world war combat experience of these submarines encouraged all major navies to build submarine cruiser prototypes between the world wars, but their cost discouraged most from further production. Japan developed the widest variety, including the A, B and J types. Germany decided against building projected 3,140-ton type XI U-boats with an aircraft hangar and four 5-inch (13 cm) guns. Long-range submarines with less impressive deck guns, including Type IXD2 U-boats and United States Navy fleet submarines, were sometimes identified as cruiser submarines.
|Name||Nation||Surface displacement||Submerged displacement||Speed||Guns||Torpedo tubes||Crew||Year||Reference|
|Surcouf||France||3,250 tons||4,304 tons||18 knots (33 km/h; 21 mph)||2 × 203mm (8in) 50 caliber||10||118||1934|||
|Narwhal-class||USA||2,730 tons||4,050 tons||17 knots (31 km/h; 20 mph)||2 × 6"/53 caliber||6||90||1928|||
|Type U-139||Germany||1,930 tons||2,483 tons||15 knots (28 km/h; 17 mph)||2 × 15 cm (5.9 in)||6||62||1916|||
|Type U-151||Germany||1,512 tons||1,875 tons||12 knots (22 km/h; 14 mph)||2 × 15 cm (5.9 in)||6||56||1917|||
|Type J1||Japan||2,135 tons||2,791 tons||18 knots (33 km/h; 21 mph)||2 × 14 cm (5.5 in)/40 caliber||6||80||1926|||
|Type B1||Japan||2,584 tons||3,654 tons||23 knots (43 km/h; 26 mph)||1 × 14 cm (5.5 in)/40 caliber||6||100||1940|||
|Type AM||Japan||3,603 tons||4,762 tons||16 knots (30 km/h; 18 mph)||1 × 14 cm (5.5 in)/40 caliber||6||100||1944|||
|HMS X1||Royal Navy||2,780 tons||3,600 tons||19 knots (35 km/h; 22 mph)||4 × 5.2 in (13 cm)||6||110||1923|||
|Kaidai class||Japan||1,833 tons||2,602 tons||23 knots (43 km/h; 26 mph)||1 × 12 cm (4.7 in)||6||80||1930|||
|K-class||Soviet Union||1,490 tons||2,104 tons||22.5 knots (41.7 km/h; 25.9 mph)||2 × 10 cm (3.9 in)||10||67||1939|||
|Type IXD2||Germany||1,616 tons||1,804 tons||19 knots (35 km/h; 22 mph)||1 × 10.5 cm (4.1 in)||6||57||1938|||
|Cagni class||Italy||1,461 tons||2,136 tons||18 knots (33 km/h; 21 mph)||2 × 10 cm (3.9 in)||14||85||1940|||
- Blair, p.501
- Tarrant, pp.44-60
- Lenton, pp.198&199
- Avalanch Press page on Sucouf says 8 external tubes (2x4), apparently one each 55cm & 40cm (1x4 each), but not how many in the hull.
- le Masson, p.157
- Silverstone, p.186
- Gray, p.227
- Watts, p.167
- Watts, p.185
- Watts, p.200
- Lenton & Colledge, p.136
- Watts, p.188
- Taylor, p.104
- Kafka & Pepperburg, p.790
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- Gray, Edwyn A. (1972). The Killing Time. New York: Charles Scribner's Sons.
- Kafka, Roger; Pepperburg, Roy L. (1946). Warships of the World. New York: Cornell Maritime Press.
- le Masson, Henri (1969). Navies of the Second World War. The French Navy 1. Garden City, New York: Doubleday & Company.
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- Lenton, H.T.; Colledge, J.J. (1964). British and Dominion Warships of World War II. Garden City, New York: Doubleday & Company.
- Potter, E.B.; Nimitz, Chester W. (1960). Sea Power. Englewood Cliffs, New Jersey: Prentice-Hall.
- Silverstone, Paul H. (1968). U.S. Warships of World War II. Garden City, New York: Doubleday & Company.
- Tarrant, V.E. (1989). The U-Boat Offensive 1914-1945. London: Cassell & Company. ISBN 1-85409-520-X.
- Taylor, J.C. (1966). German Warships of World War II. Garden City, New York: Doubleday & Company.
- Watts, Anthony J. (1966). Japanese Warships of World War II. Garden City, New York: Doubleday & Company.