PGM-63 on 9 May 1963 trials - J. M. Martinac Shipbuilding Corp
|Preceded by||PGM-9 class|
|Succeeded by||Asheville class|
|Length||101 ft (31 m)|
|Beam||21 ft (6.4 m)|
|Draft||6.8–9 ft (2.1–2.7 m)|
|Speed||17 knots (31 km/h; 20 mph)|
The PGM-39-class gunboats, designated Patrol Gunboat, Motor[a] by the United States Navy were a class of fifty nine gunboats constructed in various shipyards from 1959–1970. The design was based on the United States Coast Guard Cape-class cutter design with a five-foot (1.5 m) hull extension. It was specifically designed for the U.S. Military Assistance Program and was used by the navies of The Philippines, Indonesia, South Vietnam, Thailand, Burma, Ethiopia, and Ecuador.
The members of this class of gunboats are:
PGM-39 to PGM-46
PGM-51 to PGM-83
PGM-102 to PGM-108
PGM-111 to PGM-117
PGM-122 to PGM-124
The first vessel (PGM-39) of the class was used by the Philippine Navy as BRP Agusan (PG 61). The other Philippine Navy units were PGM-40 as BRP Catanduanes (PG 62), PGM-41 as BRP Romblon (PG 63), PGM-42 as BRP Palawan (PG 64), and PGM-83 as BRP Basilan (PG 60) ex-RVN Hon Troc (HQ 618).
The PGM-39 class has varied weapons mix of 40 mm and 20 mm cannon, 12.7 mm machine guns, and 81mm mortar.
BRP Palawan (PG 64) and BAP Río Chira (PC 12) are still in operation with the Philippine Coast Guard and Peruvian Coast Guard, respectively. Other PGMs are still in service in various capacities. However, the galvanic reaction between the steel hull and aluminum superstructure of the boats in seawater creates maintenance problems which significantly shorten their careers as military vessels.
The Asheville-class gunboat resulted from modification studies of the PGM-39 class.