P-class cruiser
| Class overview | |
|---|---|
| Operators |  Kriegsmarine |
| Preceded by | D-class cruiser (planned) |
| Succeeded by | Admiral Hipper class |
| Planned | 12 |
| Completed | 0 |
| Cancelled | 12 |
| General characteristics | |
| Type | Heavy cruiser |
| Displacement |
|
| Length |
|
| Beam | 26 m (85 ft 4 in) |
| Draft | 7.20 m (23 ft 7 in) |
| Installed power | 165,000 PS (163,000 shp ) |
| Propulsion | 12 × diesel engines |
| Speed | 33 knots (61 km/h; 38 mph) |
| Range | 25,000 nmi (46,000 km; 29,000 mi) at 13 knots (24 km/h; 15 mph) |
| Armament |
|
| Armor |
|
| Aircraft carried | 2 × Arado 196 seaplanes |
| Aviation facilities | 2 × steam catapults |
The P class was a planned group of twelve heavy cruisers of Nazi Germany's Kriegsmarine; they were the successor to the Deutschland-class cruisers. Design work began in 1937 and continued until 1939; at least twenty designs were submitted with nine of them being considered. There were three designs that were selected as the final contenders. One design was armed with six 283mm main guns in one triple turret forward and one more turret aft. It had two 150mm double secondary gun turrets as secondary armament with one being positioned above and just fore of the aft of the main 283mm main turret, and the other being in front and lower of the front main gun turret. This design had more beam than the other 2 designs. It also mounted 2 seaplanes on its fantail instead of the mid ship area. The final design was armed with six 28 cm (11 in) quick-firing guns in two triple turrets, as in the preceding Deutschland class. The ships were designated as Panzerschiff (armored ship), and given the preliminary names P1–P12. They were an improved design over the preceding planned D-class cruisers, which had been canceled in 1934. Although the ships were already assigned to shipyards, construction never began on the P-class ships after the O-class battlecruiser design superseded them.
Design
In the early 1930s, Adolf Hitler began a rearmament program in Germany. He signed the Anglo-German Naval Agreement in 1935, which allowed Germany to build up its navy to 35 percent of the strength of the British Royal Navy and effectively repudiated the restrictions of the Treaty of Versailles on the German fleet.[1] This led to a decision in 1937 to build ships to an improved Deutschland-class cruiser design, which were at that time classified as "panzerschiff" (armored ship).[2] Design work on the new class of armored ships began that year.[3] After more than twenty designs were evaluated to meet the navy's specifications, one was chosen; it was designated as cruiser "P".[2] It called for a ship that displaced 20,000-metric-ton (19,684-long-ton), which had a maximum speed of 34 to 35 knots (63 to 65 km/h; 39 to 40 mph), and was armed with a main battery of six 28 cm (11 in) guns in two triple turrets.[4]
By 1938, it became clear to Admiral Erich Raeder that Hitler's aggressive foreign policy would bring conflict with Britain. He therefore decided that a significantly larger force of armored ships would be necessary to execute an effective commerce raiding campaign against the British. Raeder's intention to fight a commerce war against Britain was the basis for Plan Z,[1] which included twelve ships of the P-class design.[2] The design work on the new ships proceeded in parallel with work on the O-class battlecruiser design.[5] Experiments were conducted on at least nine different design proposals between March 1938 and December 1939. The designs varied somewhat in terms of dimensions as well as armament; some of the designs featured three 28 cm triple turrets.[3]
Many problems were encountered with designing the ships, the most prevalent being armor. The required maximum speed of 34 kn (63 km/h; 39 mph) meant that the minimum length had to grow from the original 217 m (711 ft 11 in) to 229.50 m (752 ft 11 in). It also meant that the beam could be a minimum of 25 m (82 ft)—unless diesel engines, like those used in the Deutschland's, were desired; they would increase the beam by 2 m (6 ft 7 in). Unfortunately for the designers, the widened beam meant that an even longer hull was needed to maintain hydrodynamic efficiency. All of this complicated the armor arrangements, as more armor was needed to cover the hull as it grew in size. Eventually it was deemed that it was impossible to include diesel power on a 20,000-metric-ton displacement. The displacement limit was therefore increased to accommodate diesel engines.[6]
Initially, twelve ships were ordered based on the P-class design. The ships were ordered under the provisional names P1 through P12; the contracts were awarded to a number of German shipyards, including
General characteristics and machinery
The P-class ships were to have been 223 m (731 ft 8 in) long
The ships were designed to be equipped with twelve MAN 9-cylinder V-configuration double acting two-stroke diesel engines, which were arranged in four sets of three, each of which drove one of four shafts. The shafts each turned a
Armament and armor
The ships were armed with a main battery of six 28 cm (11 in) quick-firing guns mounted in two triple turrets, one fore and one aft on the centerline. It is not known if these were to have been the same 28 cm SK C/28 guns as the preceding Deutschland-class cruisers, or the 28 cm SK C/34 guns used by the Scharnhorst-class battleships. The ships were also armed with a secondary battery of four 15 cm (5.9 in)/L55 guns in two twin turrets, also mounted on the centerline, fore and aft. The fore 28 cm turret would have been superfiring over the fore 15 cm turret; the layout was reversed for the aft pair of turrets.[3] The 15 cm twin turrets were Drh L. C/34 mounts—the same type as those fitted to the Bismarck- and Scharnhorst-class battleships, as well as a number of other designs. The turrets allowed depression to −10 degrees and elevation to 40 degrees, which enabled a maximum range of 22,000 m (24,000 yd). The 15 cm guns had a rate of fire of between 6 and 8 45.3 kg (100 lb) rounds per minute, at a muzzle velocity of 875 meters per second (2,871 ft/s). The guns used two propellant charges: a 14.15 kg (31.2 lb) RPC/38 fore charge and a 23.5 kg (52 lb) main charge in a brass cartridge.[8]
The P-class ships were to have mounted a fairly small anti-aircraft battery: four 10.5 cm (4.1 in)/L65 high-angle guns and four 3.7 cm (1.5 in) Flak guns.
The armor layout was to have used
Footnotes
References
- DiGiulian, Tony (20 November 2008). "German 15 cm/55 (5.9") SK C/28". NavWeaps.com. Retrieved 2 June 2009.
- DiGiulian, Tony (26 January 2009). "German 10.5 cm/65 (4.1") SK C/33". NavWeaps.com. Retrieved 2 June 2009.
- Garzke, William H. & Dulin, Robert O. (1985). Battleships: Axis and Neutral Battleships in World War II. Annapolis: Naval Institute Press. ISBN 978-0-87021-101-0.
- ISBN 978-0-87021-790-6.
- Sieche, Erwin (1992). "Germany". In Gardiner, Robert; Chesneau, Roger (eds.). Conway's All the World's Fighting Ships 1922–1946. London: Conway Maritime Press. pp. 218–254. ISBN 978-0-85177-146-5.