Thetis-class patrol boat

	USCGC Argo (WPC-100) underway during World War II, circa 1944.
Class overview
Name	Thetis class
Operators	United States Coast Guard
Built	1931–1934
In commission	1931–1967
Completed	18
Preserved	1
General characteristics
Type	Patrol boat
Displacement	337 long tons (342 t) (1933) ; 350 long tons (360 t) (1945);
Length	165 ft (50 m)
Beam	25 ft 3 in (7.70 m)
Draft	7 ft 8 in (2.34 m) (1933); 10 ft 0 in (3.05 m) (1945);
Installed power	1,340 bhp
Propulsion	2 × Winton Model 158 6-cylinder diesels 1,340 bhp (1,000 kW)
Speed	11 kn (20 km/h; 13 mph) cruising; 16 kn (30 km/h; 18 mph) maximum;
Range	1,750 statute miles (14 knots); 3,000 statute miles (11 knots); 6,417 statute miles (6 knots);
Complement	44 (1933); 75 (1945);
Sensors &; processing systems	None (1933; SF radar (1945); QCO sonar (1945);
Armament	1933; 1 × 3-inch gun ; 1 × 1-pounder gun ; 1941; 1 × 3-inch gun ; 1 × Y-gun ; 2 x depth charge tracks; 1945; 2 x single-mount 3-inch/50-caliber gun ; 2 x single mount 20 mm/80 cannon ; 2 x depth charge tracks; 2 x Y-guns ; 2 x Mousetraps ;

Last updated October 01, 2025

Thetis-class patrol boats, also called the Argo-class patrol boats, were a class of 18 steel-hulled cutters of the United States Coast Guard built from 1931 to 1934.^[2]^[3]^[4]

Ships

References

↑ "USCGC Atalanta". naval-history.net. Retrieved March 20, 2020.
↑ Dropkin, Les (January 2002). "The Thetis Class Coast Guard Patrol Boats" (PDF). Potomac Association. Archived from the original (PDF) on July 11, 2019.
↑ Clancey, Patrick. "Ships of the U.S. Navy, 1940-1945 Coast Guard Cutters & Craft". HyperWar Foundation via Ibiblio . Retrieved March 20, 2020.
↑ Helgason, Guðmundur. "Argo class Patrol vessels - Allied Warships of WWII - uboat.net". uboat.net. Retrieved 2025-04-20.

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[NavHist-1] "USCGC Atalanta". naval-history.net. Retrieved March 20, 2020.

[2] Dropkin, Les (January 2002). "The Thetis Class Coast Guard Patrol Boats" (PDF). Potomac Association. Archived from the original (PDF) on July 11, 2019.

[ibiblio-3] Clancey, Patrick. "Ships of the U.S. Navy, 1940-1945 Coast Guard Cutters & Craft". HyperWar Foundation via Ibiblio . Retrieved March 20, 2020.

[4] Helgason, Guðmundur. "Argo class Patrol vessels - Allied Warships of WWII - uboat.net". uboat.net. Retrieved 2025-04-20.

[1]

[2]

[3]

[4]

v t e Thetis-class patrol boats
United States Coast Guard	Argo Ariadne Atalanta Aurora Calypso Cyane Daphne Dione Galatea Hermes Icarus Nemesis Nike Pandora Perseus Thetis Triton Electra
United States Navy	Potomac (ex-Electra) Calypso
Dominican Navy	Restauración (ex-Galatea) Independencia (ex-Icarus) Rafael Atoa / Libertad (ex-Thetis)
Preceded by: Lake class Followed by: Algonquin class
List of cutters of the United States Coast Guard

Class overview
USCGC Argo (WPC-100) underway during World War II, circa 1944.
Name	Thetis class
Operators	United States Coast Guard
Built	1931–1934
In commission	1931–1967
Completed	18
Preserved	1
General characteristics
Type	Patrol boat ^[1]
Displacement	337 long tons (342 t) (1933) 350 long tons (360 t) (1945)
Length	165 ft (50 m)
Beam	25 ft 3 in (7.70 m)
Draft	7 ft 8 in (2.34 m) (1933) 10 ft 0 in (3.05 m) (1945)
Installed power	1,340 bhp
Propulsion	2 × Winton Model 158 6-cylinder diesels 1,340 bhp (1,000 kW)
Speed	11 kn (20 km/h; 13 mph) cruising 16 kn (30 km/h; 18 mph) maximum
Range	1,750 statute miles (14 knots) 3,000 statute miles (11 knots) 6,417 statute miles (6 knots)
Complement	44 (1933) 75 (1945)
Sensors & processing systems	None (1933 SF radar (1945) QCO sonar (1945)
Armament	1933 1 × 3-inch gun 1 × 1-pounder gun 1941 1 × 3-inch gun 1 × Y-gun 2 x depth charge tracks 1945 2 x single-mount 3-inch/50-caliber gun 2 x single mount 20 mm/80 cannon 2 x depth charge tracks 2 x Y-guns 2 x Mousetraps