NAVYPEDIA

Support the project with paypal


HOME
FIGHTING SHIPS OF THE WORLD
UNITED STATES OF AMERICA
COASTAL FORCES
FLAGSTAFF gun hydrofoil (1968)


Photo



Flagstaff 1970, foils retracted

Ships


Names Builders Commissioned Losses Transfers Discarding

PGH1, 11.1974- WPBH1, 2.1975- PGH1, 9.1976- WPBH1 Flagstaff

Grumman, Stuart: PGH1 Flagstaff

9/1968: PGH1 Flagstaff

none

none

9.1978: WPBH1 Flagstaff


Technical data


Displacement standard, t

57

Displacement full, t

67

Length, m

22.7

Breadth, m

6.50

Draught, m

4.10 (foils extended) / 1.30 (foils retracted)

No of shafts

1 shaft (for foil-borne) / 2 water-jets (for hull-borne)

Machinery

CODOG: 1 Rolls-Royce Tyne gas turbine (foil-borne) / 2 General Motors diesels (hull-borne)

Power, h. p.

3620 / 300

Max speed, kts

48 / 8

Fuel, t

diesel oil

Endurance, nm(kts) 
Armament

1 x 1 - 40/60 Mk 3, 2 x 2 - 12.7/90, 1 x 1 - 81/12 M29 mortar

Electronic equipmentradar
Complement13


Graphics


<i>Flagstaff </i> 1970, foils retracted
Flagstaff 1970, foils retracted


Project history

By the early 1960s interest had shifted towards the fast gunboat role, and it appeared that a relatively small hydrofoil could duplicate many of the qualities of the larger Asheville class fast gunboat. Two competitive prototypes were built under the FY66 (SCB 252) programme; the Grumman Flagstaff and the Boeing Tucumcari. At one time a follow-on class of thirty-four hydrofoils was planned, with features borrowed from both. They differed largely in propulsion, Grumman using a geared propeller with the main lifting surface forward; Boeing, water-jets with the main foil surfaces aft. Both were tested in Vietnam, returning home in 1970. Originally armed with 40mm gun forward.

Modernizations

1971 (temporarily for tests): - 1 x 1 - 40/60; + 1 x 1 -152/12 M81E1 tank gun

1974: armament consisted from small arms only

Naval service

: Flagstaff was badly damaged in collision with a whale and was sold in 1978.

© Ivan Gogin, 2015