Allison T406 / AE 1107C-Liberty
Rolls-Royce T406

The Rolls-Royce T406 (company designation AE 1107C-Liberty) is a turboshaft engine which powers the Bell-Boeing V-22 Osprey tiltrotor. The engine delivers 6,000 shp (4,470 kW) and shares a common core with the AE 3007 and AE 2100 series of engines.

The V-22's T406 powerplants are housed in wing-tip tilting nacelles, allowing the distinctive flight characteristics of the V-22. For take off and landing the nacelles are directed vertically (90° to fuselage), while for forward flight they are rotated parallel to fuselage.

In April 2012, the DoD ordered 70 AE 1107C engines for the Osprey, with options for up to 268 engines.

Applications
V-22 Osprey

Specifications:
T406
Type: Turboshaft
Length: 78.1 in (1,980 mm)
Diameter: 34.2 in (890 mm)
Dry weight: 971 lb (440 kg)
Compressor: 14-stage high pressure axial compressor
Turbine: 2-stage high pressure and 2-stage power turbine
Maximum power output: 6,150 shp (4,586 kW)
Overall pressure ratio: 16.7:1
Power-to-weight ratio: 6.33 shp/lb (10.4 kW/kg)