NAVYPEDIA

Photo

  San Carlos 1944

Ships

No	Name	Yard No	Builder	Laid down	Launched	Comm	Fate
AVP10	Barnegat		Puget Sound N Yd, Bremerton	10.1939	23.5.1941	7/1941	stricken 5.1958
AVP11, 10.1944- AGC18, 7.1946- WAVP385, 5.1966- WHEC385	Biscayne, 7.1946- Dexter		Puget Sound N Yd, Bremerton	1939	23.5.1941	7.1941	amphibious command ship 4.1943, Coast Guard cutter 7.1946, training Coast Guard cutter 7.1958, stricken 7.1968
AVP12, 4.1949- WAVP370, 5.1966- WHEC370	Casco		Puget Sound N Yd, Bremerton	5.1940	12.11.1941	12.1941	Coast Guard cutter 4.1949, stricken 3.1969
AVP13, 4.1949- WAVP371, 5.1966- WHEC371	Mackinac		Puget Sound N Yd, Bremerton	5.1940	15.11.1941	1.1942	Coast Guard cutter 4.1949, stricken 7.1968
AVP21, 7.1945- AG121, 9.1945- AVP21, 1.1949- WAVP372, 5.1966- WHEC372	Humboldt		Boston N Yd, Charlestown	9.1940	17.3.1941	7.1941	Coast Guard cutter 1.1949, stricken 9.1969
AVP22, 7.1945- AG122, 9.1945- AVP22, 3.1949- WAVP373, 5.1966- WHEC373	Matagorda		Boston N Yd, Charlestown	9.1940	18.3.1941	12.1941	Coast Guard cutter 3.1949, stricken 7.1968
AVP23, 1.1949- WAVP374, 5.1966- WHEC374	Absecon		Lake Washington, Houghton	7.1941	8.3.1942	1.1943	Coast Guard cutter 1.1949, to South Vietnam 6.1972 (Phạm Ngũ Lão)
AVP24, 3.1949- WAVP375, 5.1966 - WHEC375	Chincoteague		Lake Washington, Houghton	7.1941	15.4.1942	4.1943	Coast Guard cutter 3.1949, to South Vietnam 6.1972 (Lý Thường Kiệt)
AVP25, 1.1949- WAVP376, 5.1966 - WHEC376	Coos Bay		Lake Washington, Houghton	8.1941	15.5.1942	5.1943	Coast Guard cutter 1.1949, stricken 9.1967
AVP26, 9.1948- WAVP378, 5.1966- WHEC378	Half Moon		Lake Washington, Houghton	3.1942	12.7.1942	6.1943	Coast Guard cutter 9.1948, stricken 7.1969
AVP27	Mobjack		Lake Washington, Houghton	2.1942	2.8.1942	10.1943 // ---	completed as motor torpedo boat depot ship AGP7
AVP28	Oyster Bay		Lake Washington, Houghton	4.1942	7.9.1942	11.1943 // ---	completed as motor torpedo boat depot ship AGP6
AVP29, 12.1948- WAVP377, 1965- WAGO377, 5.1966- WHEC377, 9.1971- WOLE377	Rockaway	29	Associated, Seattle	6.1941	14.2.1942	1.1943	Coast Guard cutter 12.1948, Coast Guard survey vessel 1965, Coast Guard cutter 5.1966, Coast Guard off-shore law enforcement vessel 9.1971, stricken 1.1972
AVP30	San Pablo	30	Associated, Seattle	7.1941	31.3.1942	3.1943	survey vessel AGS30 8.1949
AVP31, 9.1948- WAVP379, 5.1966- WHEC379, 11.1969-  WTR379, 8.1977- WHEC379	Unimak	31	Associated, Seattle	2.1942	27.5.1942	12.1943	Coast Guard cutter 9.1948, training Coast Guard cutter 11.1969, Coast Guard cutter 8.1977, stricken 4.1988
AVP32, 8.1948- WAVP380, 5.1966- WHEC380	Yakutat	32	Associated, Seattle	4.1942	2.7.1942	3.1944	Coast Guard cutter 8.1948, to South Vietnam 1.1971 (Trần Nhật Duật)
AVP33, 9.1948- WAVP381, 5.1966- WHEC381	Barataria		Lake Washington, Houghton	4.1943	2.10.1943	8.1944	Coast Guard cutter 9.1948, decommissioned 8.1969, sold 10.1970
AVP34, 9.1948- WAVP382, 5.1966- WHEC382	Bering Strait		Lake Washington, Houghton	6.1943	15.1.1944	7.1944	Coast Guard cutter 9.1948, to South Vietnam 1.1971 (Trần Quang Khải)
AVP35, 9.1948- WAVP383, 5.1966- WHEC383	Castle Rock		Lake Washington, Houghton	7.1943	11.3.1944	10.1944	Coast Guard cutter 9.1948, to South Vietnam 12.1971 (Trần Bình Trọng)
AVP36, 9.1948- WAVP384, 5.1966- WHEC384	Cook Inlet		Lake Washington, Houghton	8.1943	13.5.1944	11.1944	Coast Guard cutter 9.1948, to South Vietnam 12.1971 (Trần Quốc Toản)
AVP37	Corson		Lake Washington, Houghton	10.1943	15.7.1944	12.1944	stricken 4.1966
AVP38	Duxbury Bay		Lake Washington, Houghton	1.1944	2.10.1944	12.1944	stricken 5.1966
AVP39	Gardiners Bay		Lake Washington, Houghton	3.1944	2.12.1944	2.1945	to Norway 5.1958 (Haakon VII)
AVP40	Floyds Bay		Lake Washington, Houghton	5.1944	28.1.1945	3.1945	stricken 3.1960
AVP41	Greenwich Bay		Lake Washington, Houghton	7.1944	18.3.1945	5.1945	stricken 7.1966
AVP42	Hatteras		Lake Washington, Houghton	---	---	---	cancelled 4.1943
AVP43	Hempstead		Lake Washington, Houghton	---	---	---	cancelled 4.1943
AVP44	Kamishak		Lake Washington, Houghton	---	---	---	cancelled 4.1943
AVP45	Magothy		Lake Washington, Houghton	---	---	---	cancelled 4.1943
AVP46	Matanzas		Lake Washington, Houghton	---	---	---	cancelled 4.1943
AVP47	Metomkin		Lake Washington, Houghton	---	---	---	cancelled 4.1943
AVP48	Onslow		Lake Washington, Houghton	5.1942	20.9.1942	12.1943	stricken 6.1960
AVP49	Orca		Lake Washington, Houghton	7.1942	4.10.1942	1.1944	to Ethiopia 1.1962 (ኢትዮጵያ [Ethiopia])
AVP50	Rehoboth		Lake Washington, Houghton	8.1942	8.11.1942	2.1944	survey ship AGS50 11.1949
AVP51	San Carlos		Lake Washington, Houghton	9.1942	20.12.1942	3.1944	oceanographic research ship AGOR1 Josiah Willard Gibbs 12.1958
AVP52	Shelikof		Lake Washington, Houghton	9.1942	31.3.1943	4.1944	stricken 5.1960
AVP53	Suisun		Lake Washington, Houghton	10.1942	14.3.1943	9.1944	stricken 4.1966
AVP54	Timbalier		Lake Washington, Houghton	11.1942	18.4.1943	5.1946	stricken 5.1960
AVP55, 12.1965- AGF1	Valcour		Lake Washington, Houghton	12.1942	5.7.1943	7.1946	command ship 12.1965, stricken 1.1973
AVP56, 5.1946- WAVP386, 5.1966- WHEC386	Wachapreague, 5.1946- McCulloch		Lake Washington, Houghton	2.1943	10.7.1943	5.1944 // 5.1946	completed as motor torpedo boat depot ship AGP8, Coast Guard cutter 5.1946, to South Vietnam 6.1972 (Ngô Quyền)
AVP57, 6.1946- WAVP387, 5.1966- WHEC387	Willoughby, 6.1946- Gresham		Lake Washington, Houghton	3.1943	21.8.1943	6.1944 // 6.1946	completed as motor torpedo boat depot ship AGP9, Coast Guard cutter 6.1946, weather ship WAGW387 2.1970

Technical data

Displacement standard, t	2040
Displacement full, t	2410 - 2620
Length, m	91.4 wl 94.7 oa
Breadth, m	12.5
Draught, m	3.78 full load
No of shafts	2
Machinery	4 Fairbank-Morse 38D81/8x10 diesel-generators, 2 electric motors
Power, h. p.	6080
Max speed, kts	20
Fuel, t	diesel oil 260
Endurance, nm(kts)	6000 (12)
Armament	AVP10 - 13, 21, 22: 2 x 1 - 127/38 Mk 12, 4 x 1 - 12.7/90, 12 seaplanes (SOC, OS2U) AVP23 - 26, 29 - 32, 48 - 51: 4 x 1 - 127/38 Mk 12, 4 x 2 - 20/70 Mk 4, 2 DCT, 2 DCR, 12 seaplanes (SOC, SO3C, OS2U) AVP33: 4 x 1 - 127/38 Mk 12, 4 x 2 - 20/70 Mk 4, 2 DCT, 2 DCR, 12 seaplanes (SOC, OS2U) AVP34: 1 x 1 - 127/38 Mk 12, 1 x 4 - 40/56 Mk 1.2, 2 x 2 - 40/56 Mk 1.2, 6 x 1 - 20/70 Mk 4, 2 DCT, 2 DCR, 12 seaplanes (SOC, OS2U) AVP35 - 38: 1 x 1 - 127/38 Mk 12, 1 x 4 - 40/56 Mk 1.2, 2 x 2 - 40/56 Mk 1.2, 6 x 1 - 20/70 Mk 4, 2 DCT, 2 DCR, 12 seaplanes (SOC, SC, OS2U) AVP39 - 41: 1 x 1 - 127/38 Mk 12, 1 x 4 - 40/56 Mk 1.2, 2 x 2 - 40/56 Mk 1.2, 6 x 1 - 20/70 Mk 4, 2 DCT, 2 DCR, 12 seaplanes (SC, OS2U) AVP52, 53: 2 x 1 - 127/38 Mk 12, 4 x 2 - 20/70 Mk 4, 2 DCT, 2 DCR, 12 seaplanes (SOC, OS2U, SC) AVP54, 55: 2 x 1 - 127/38 Mk 30, 4 x 2 - 20/70 Mk 24, 2 DCT, 2 DCR, 12 seaplanes (OS2U, SC) WAVP386, 387: 1 x 1 - 127/38 Mk 30, 2 x 2 - 40/56 Mk 1, 1 x 24 - 178 Hedgehog Mk 15 ASWRL, 4 DCT
Electronic equipment	presumably SA, SF or SL or SU, Mk 26 radars, QCJ sonar
Complement	367

Standard scale images

Graphics

Aircraft facilities

Aircraft fuel stowage was 303 000 l. There was 1 crane for handling seaplanes.

Project history

Unique American purpose-built small seaplane tenders. Intended for seaplane maintenance on distant Pacific islands and atolls with a harbour shallow depth that has predetermined occurrence in the design assignment of strong draught limitations. As in a wartime it was supposed to attract these ships as escorts of large tenders, the project provided fitting of anti-submarine armament and sonar.

Small seaplane tenders could provide basing of one seaplanes squadron. Designed armament was limited by two DP 127/38mm guns and 4 12.7mm MGs, but in 1942, when the first ships of this class were already commissioned, the new structure of armament has been approved: 4x1 127/38mm, 8x1 20mm MGs and 2 DCTs. Really ships were commissioned having from one to four 127mm guns and 6-8 20mm MGs.

In total 39 ships of this type have been ordered, the order for six of them later had canceled, four were completed as PT depot ships (AGP6-9).

Modernizations

1943, Absecon: was converted to training ship for cruisers air groups. One catapult was fitted. - 2 x 1 -127/38, 2 DCT, 2 DCR

1943 - 1944, Barnegat, Biscayne, Casco, Mackinac, Humboldt, Matagorda: - 4 x 1 - 12.7/90; + 4 x 2 - 20/70 Mk 4, 2 DCT, 2 DCR

1943 - 1944, Chincoteague, Half Moon, Rockaway, San Pablo, Unimak, Yakutat, Onslow, Orca, Rehoboth, San Carlos, Barataria: - 2 x 1 - 127/38

1943 - 1944, Coos Bay: - 2 x 1 - 127/38; + 2 x 4 - 178 Mousetrap Mk 20 ASWRL

1944 - 1945, many ships: - 1 x 1 -127/38; + 1 x 4 - 40/56 Mk 1.2

1/1946, Barnegat, Biscayne, Casco, Mackinac, Humboldt, Matagorda, Chincoteague, Half Moon, Rockaway, San Pablo, Unimak, Yakutat, Barataria, Onslow, Orca, Rehoboth, San Carlos, Shelikof, Suisun: 1 x 1 - 127/38 Mk 30, 1 x 4 - 40/60 Mk 2, 4 x 2 - 20/70 Mk 24, 2 DCT, 2 DCR, 12 seaplanes, presumably SA, SF or SL or SU, Mk 26 radars, QGa sonar

1/1946, Absecon: 1 x 1 - 127/38 Mk 30, 1 x 4 - 40/60 Mk 2, 4 x 2 - 20/70 Mk 24, 1 catapult, 12 seaplanes, presumably SA, SF or SL or SU, Mk 26 radars, QGa sonar

1/1946, Coos Bay: 1 x 1 - 127/38 Mk 30, 1 x 4 - 40/60 Mk 2, 4 x 2 - 20/70 Mk 24, 2 x 4 - 178 Mousetrap Mk 20 ASWRL, 2 DCT, 2 DCR, 12 seaplanes, presumably SA, SF or SL or SU, Mk 26 radars, QGa sonar

1/1946, Bering Strait, Castle Rock, Cook Inlet, Corson, Duxbury Bay, Gardiners Bay, Floyd Bay, Greenwich Bay: 1 x 1 - 127/38 Mk 30, 1 x 4 - 40/60 Mk 2, 2 x 2 - 40/60 Mk 1, 6 x 1 - 20/70 Mk 10, 2 DCT, 2 DCR, 12 seaplanes, presumably SA, SF or SL or SU, Mk 26 radars, QGa sonar

1946-1949, Casco, Mackinac, Humboldt, Matagorda, Chincoteague, Coos Bay, Half Moon, Rockaway, Unimak, Yakutat, Barataria, Bering Strait, Castle Rock, Cook Inlet received new armament consisted of 1 x 1 - 127/38 Mk 30, 2 x 2 - 40/60 Mk 1, 1 x 24 - 178 Hedgehog Mk 15 ASWRL, 4 DCT, meteorological balloon, SA, SF or SL, SU, Mk 26 radars, QGa sonar

1948, Dexter received new armament consisted of 1 x 1 - 127/38 Mk 30, 1 x 24 - 178 Hedgehog Mk 15 ASWRL, 4 DCT, meteorological balloon, SA, SF or SL, SU, Mk 26 radars, QGa sonar

1948, Absecon received new armament consisted of 1 x 1 - 127/38 Mk 30, 1 x 4 - 40/60 Mk 2, 1 x 24 - 178 Hedgehog Mk 15 ASWRL, 4 DCT, meteorological baloon, SA, SF or SL, SU, Mk 26 radars, QGa sonar

1957, Dexter: diesels were replaced by new Fairbank-Morse.

early 1960s, all survived Coast Guard cutters: + SPQ-10 radar

1960s, all survived: - SA, SF or SL, SU radars; + SPS-6, SPS-10 radars

mid-1960s, all survived Coast Guard cutters: - balloon; + 2 x 3 - 324 ASW TT

Naval service

: Absecon was completed as TS for training of pilots of shipboard seaplanes and equipped by a catapult (originally intended for one of incomplete Cleveland class cruiser). Chincoteague 17.7.1943 was damaged by Japanese aircraft. Orca 5.1.1945 was damaged by kamikaze.