Pratt & Whitney JT12

The Pratt & Whitney JT12 (military name Pratt & Whitney J60 ) is a single-shaft turbojet engine from the US manufacturer Pratt & Whitney .

The engine has a 9-stage axial compressor, an annular combustion chamber with eight flame tubes, and is driven by a 2-stage axial turbine.

The design work began in July 1957. As early as May 1958, the first prototype was being tested. The first test engines were delivered in July 1959. The starting thrust achieved was 12.9 kN, the MTBO initially only 50 hours. The first series engines manufactured in October 1960 already had a thrust of 13.3 kN, which was later increased to 14.6 kN. The MTBO had meanwhile been increased to 3000 hours. By 1969, 2032 units had been delivered.

The North American T-2B Buckeye , the North American T-39A Sabreliner and the Lockheed L-1329 Jetstar , among others, were equipped with these engines.

The Pratt & Whitney JFTD12 represents a further development to a shaft drive .

Technical data (JT-12A-8)

• Compressor stages: 9
• Turbine stages: 2
• Waves: 1
• Diameter: 556 mm
• Length: 1930 mm
• Weight: 212 kg
• Thrust: 14.6 kN
• Compression: 6.4: 1
• Turbine inlet temperature: 1145 K
• Maximum speed: 16200 min-1