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ROYAL NORWEGIAN NAVY (NORWAY)

ESCORTS

KONG HAAKON VII patrol craft (1942/1942)

Kong Haakon VII 1943

No Name Builder Laid down Launched Comm Fate
Kong Haakon VII (ex-PC467)   Geo Lawley, Neponset, USA 10/1941 29/4/1942 6/1942 // 9/1942 stricken 8/1957

 

Displacement standard, t

280

Displacement full, t

330

Length, m

51.8 wl 52.9 oa

Breadth, m

7.06

Draught, m

2.36 full load

No of shafts

2

Machinery

2 diesels

Power, h. p.

2880

Max speed, kts

21

Fuel, t

diesel oil 49
Endurance, nm (kts) 3000 (12) - 4800 (12)

Armament

2 x 1 - 76/50 Mk 20/21, 3 х 1 - 12.7/90, 2 DCT, 2 DCR

Sensors

sonar

Complement 59

 

Ship project history: American PC-class submarine chaser, transferred by Roosevelt as a gift to Norwegian king Haakon.

    In 1938 requirements have been prepared for the small patrol ship (PC, patrol craft) which should come instead of morally and physically out-of-date ships of Eagle class. Basic purpose of this ship would be escort of coastal convoys and anti-submarine service in base area. The task provided speed not less than 22kts and an endurance of 3000(12)nm. Under the FY1938 program two "prototypes" were built: 173-ft flush-decked turbine-engined РС452 and 165-ft diesel-engined РС451 with forecastle. During trials in 1940 РС452 has shown the better seaworthiness and higher speed, however low reliability of her experimental machinery have not allowed to mass-building this in remaining the successful ship. At the same time the diesel-powered variant, РС451, also did not suit a series: unsatisfactory seagoing capacities make use of armament very difficult. It was not represented possible to correct this lack by increasing of dimensions because of imminent decreasing of speed. The matter is that in the USA then was not available diesels appropriate for installation on small ships with more than 1500hp power. In addition to complexities with machinery choice the mite in the list of problems with designing was brought by President Roosevelt, demanded to establish the second 76mm gun.

The way out has been found after study of variant of installation of diesels into the hull of 173-ft "prototype". Thus, the truth, was necessary to refuse from 22kts. Contract speed was lowered on 2kts, and on trials lead РС461 reached 21.16kts, the truth, at the displacement close to standard. Increasing, in comparison with "prototype", on 0.2m of a hull breadth has allowed to place heavier armament. The project was ready in the early 1941, and in March, 1942 Navy received first serial ships.

Modernizations: 1943 - 1944: - 1 x 1 - 76/50, 3 x 1 - 12.7/90; + 1 x 1 - 40/56 Bofors Mk III, 5 x 1 - 20/70 Oerlikon Mk II/IV, 2 DCT

Naval service: No significant events.

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© Ivan Gogin, 2010-15