Based on the T38, the T56 was designed for the C-130 Hercules. First ordered in 1954, the T56 is still in production by Rolls-Royce.
Nearly 17,000 T56s and its commercial version, the 501-D, have been produced.

models

• T56-A-15: 4,508 hp (3362 kW)
• T56-A-425: 4,910 hp (3661 kW)
• 501-D13: 3,750 hp (2,800 kW)

specifications

• Turboprop
• Compressor: 14-stage axial
• Turbine: 4-stage
• Mass flow: 32 lbs/sec
• Pressure ratio: 9.25

used by

• Boeing 377-SG Super Guppy
• Convair CV-580
• Grumman E-2 Hawkeye
• Lockheed C-130 Hercules
• Lockheed L-188 Electra
• Lockheed P-3 Orion