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fighting ships of the world

UNITED STATES OF AMERICA

 

COASTAL FORCES

 

PT812 torpedo boat (1951)

 

No Name Yard No Builder Laid down Launched Comm Fate
PT812     Philadelphia N Yd 10/1949 1/2/1951 5/1951 auxiliary 11/1959

 

Displacement standard, t

 

Displacement full, t

102

Length, m

30.5 wl 32.0 oa

Breadth, m

6.71

Draught, m

1.65

No of shafts

4

Machinery

4 Packard diesels

Power, h. p.

10000

Max speed, kts

38.2

Fuel, t

petrol

Endurance, nm (kts)

 

Armament

2 x 1 - 40/60 Mk 3, 2 x 2 - 20/70 Mk 24, 1 x 1 - 81/12 M29 mortar, 4 - 572 TR (never really carried), 4 DC

Sensors

SPS-5 radar

Complement

17

Ship project history: PT809-812 were intended to embody wartime design lessons. All were aluminium; 809 was riveted, 810 riveted and welded, and 811 and 812 all-welded; each was designed to mount two single 40mm guns (one in 812), two twin 20mm, one 81mm mortar, one Mk 107 rocket launcher (812 only), four torpedo racks, and four depth charge racks; speed was set at 46kts (43 for the somewhat longer 812). Although these figures represented a considerable advance on Second World War practice, they still did not make up for the lack of an operational requirement for such coastal craft.

Modernizations: 1956: was re-engined with 2 4000shp gas turbines on outboard shafts and 2 800bhp dieses on inboard shafts with CPPs (9600hp).

Naval service: In November 1959 PT812 was transferred to US Army as Small Boat No1 an was transferred to South Korea in April 1960.

PT812

Ivan Gogin, 2015