The TRI-40 engine is a modified version of the Microturbo TRI 60 class of small turbojets, designed to be smaller and lighter for new missiles. It is currently being used on the Kongsberg Naval Strike Missile (NSM) for the Royal Norwegian Navy and the updated MM-40 Exocet Block 3 anti-ship missile.^[2]

There are several differences between the TRI-40 and the older TRI-60 engines. One is that the -40 uses a 4-stage compressor rather than the 3 stage compressor that the original TRI-60 models use (although several newer variants of the TRI-60 use a 4-stage compressor as well).^[2] Another major difference is that the bearing system is lubricated by fuel rather than a separate oil system. Finally, the engine is much more "electric" than the TRI-60. It has a permanent magnet based generator (270 V DC) mounted directly on the engine shaft, which older engines lacked, as well as an ECU controlled fuel metering system.^[1]

Data from ^[2][3]

General characteristics

• Type: single-spool turbojet
• Length: 680 mm (26.77 in)
• Diameter: 280 mm (11.02 in)
• Dry weight: 44 kg (97 lb)

Components

• Compressor: 4 stage axial
• Combustors: annular
• Turbine: single-stage
• Fuel type: JP8, JP10

Performance

• Maximum thrust: 2.5-3.3 kN (560-750 lbf)
• Turbine inlet temperature: 1010 °C (1850 °F)
• Specific fuel consumption: < 32.7 mg/Ns (<2.65 lb/hr*lb)
• Thrust-to-weight ratio: 5.7 - 7.3

Comparable engines

• Williams F107

Related lists

• List of aircraft engines