After January 1966, directed attention was put into a new marine aircraft. A Grumman Albatross was rebuilt as a dynamically similar flying model for a projected very large STOL ASW flying-boat for the Japanese Maritime Self Defense Force. The type was developed as the four-turboprop PS-1, but later as the US-1 amphibious search-and-rescue aircraft.
The Shinn Meiwa PS 1, a four turboprop STOL amphibian with an auxiliary engine driving a boundary -layer control pump, has a speed range from 295 knots maximum to a 40 knot stall. PS 1s carry search radar, sonobuoys, MAD and ECM equipment to aid in the search for submarines, and against which they can deploy anti submarine bombs, homing torpedoes, and rockets for surface attack.
Shinn Meiwa PS-1 / US-1 Article
Designed for long-range ASW, the four-turboprop PS-1 flying boat first flew in October 1967, entered service in 1973, and was followed by the US-1 amphibious variant in October 1974.
The first prototype PS-1 was converted later as waterbombing test vehicle.
Production of the PS-¬1 was completed with the 23rd aircraft in 1979. The seventh and subsequent US-1s are fitted with uprated T-64 IHI-10J turboprops and are designated US-lAs. Earlier aircraft are being progressively retrofitted with these engines.
The JMSDF intended to purchase one US-1A SAR amphibian every two years, the next funding was being sought in FY1988.
PS-1
Engines: 4 x T64-IHI-10 turboprop, 3060 shp
Wing span: 108 ft 8.75 in (33.14 m)
Max speed 340 mph (547 km/h)
Crew: 10
All Aero 