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fighting ships of the world

UNITED STATES OF AMERICA

 

COASTAL FORCES

 

"PBR Mk I" river patrol boats (31RP661) (1966)

   

Names

31RP661-669

31RP6610-6699

31RP66100-66161

Builders

United BB, Bellingham: 31RP661-31RP66161

Commissioned

1966: 31RP661-66161

Losses

?

Transfers

late 1960s, South Vietnam: nearly all

Discarding

late 1980s: 4 units

 

 

Displacement standard, t

 

Displacement full, t

6.5

Length, m

9.50

Breadth, m

3.20

Draught, m

0.60

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

Electronic equipment

none
Complement 4

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.

Vietnamese PBR Mk I 1970

© Ivan Gogin, 2015