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fighting ships of the world

UNITED STATES OF AMERICA

 

COASTAL FORCES

 

"PBR Mk III" river patrol boats (31RP681) (1968 - 1973)

   

Names

31RP681-689

31RP6810-6878

31RP691-699

31RP6910-6918

31RP701-709

31RP7010-7020

31RP711-719

31RP7110-7120

31RP721-728

31RP731-739

31RP7310

Builders

United BB, Bellingham: 31RP681-689, 31RP6810-6878, 31RP691-699, 31RP6910-6918, 31RP701-709, 31RP7010-7020, 31RP711-719, 31RP7110-7120, 31RP721-728, 31RP731-739, 31RP7310

Commissioned

1968: 31RP681-689, 31RP6810-6878

1969: 31RP691-699, 31RP6910-6918

1970: 31RP701-709, 31RP7010-7020

1971: 31RP711-719, 31RP7110-7120

1972: 31RP721-728

1973: 31RP731-739, 31RP7310

Losses

?

Transfers

1973, South Vietnam: nearly all

Discarding

late 1980s: 8 units of Mk II and Mk III types

1990s: 27 units of Mk II and Mk III types

 

 

Displacement standard, t

 

Displacement full, t

7.1

Length, m

9.70

Breadth, m

3.60

Draught, m

0.80

No of shafts

2 water-jet pumps

Machinery

2 General Motors diesels

Power, h. p.

432

Max speed, kts

25

Fuel, t

diesel oil 0.6
Endurance, nm(kts)  

Armament

1 x 2 - 12.7/90, 1 x 1 - 12.7/90, 1 x 1 - 60/12 M19 mortar, 1 x 1 - 40/10 M19 grenade launcher

Sensors

none
Complement 4

Ship project history: The Patrol Boat, River was smaller than the PCF, with an open-topped conning position, and had a fiberglass hull lined with plastic foam; it was propelled and steered by water-jets, for an extremely shallow draft (0.9m compared to 1.2m for a Swift). 

Modernizations: None.

Naval service: The great majority of US PBRs were transferred to South Vietnam. The PBRs were based afloat, LST846, 821, 838 and 786 being converted to support them. In 1994, twenty-seven PBR Mk II remained. Some had been used during the 1991 Gulf conflict.

PBR Mk II

Ivan Gogin, 2015