Engine Walkaround vol.17: General Eletric J47

Suject: General Eletric J47 Jet Engine

Location: USAF Museum, Dayton Ohio, USA.

Comments:The General Electric J47 turbojet (GE company designation TG-190) was developed by General Electric from the earlier J35 engine, and first flew in May 1948. The J47 was the first axial-flow turbojet approved for commercial use in the United States. It was used in many types of aircraft and more than 30,000 were manufactured before production ceased in 1956. It saw continued service in the US military until 1978. Overhaul life for the J47 ranged from 15 hours (in 1948) to a theoretical 1,200 hours (625 achievable in practice) in 1956. For example, the J47-GE-23 was rated to run 225 hours between overhauls. As installed on the F-86F, it experienced one in-flight shutdown every 33,000 hours in 1955 and 1956.

Description:

• Type: turbojet
• Length: 145 inches (3.7 m) (with tailcone)
• Diameter: 36.75 inches (0.933 m) maximum
• Dry weight: 2,554 pounds (1,158 kg) dry, equipped

• Compressor: 12-stage axial compressor
• Turbine: Single-stage axial
• Fuel type: JP-1, JP-2, JP-3, JP-4 or MIL-F-5572 gasoline
• Oil system: Pressure feed spray with scavenge

• Maximum thrust:
• 5,970 lbf (26.56 kN) at 7950 rpm
• 6,970 lbf (31.00 kN) with water injection
• Overall pressure ratio: 5.35
• Air mass flow: 92 lb (42 kg) / sec
• Specific fuel consumption: 1.014 lb/lbf/hr (103.36 kg/kN/hr)
• Thrust-to-weight ratio: 2.34 lbf/lb at take-off dry power

Ref: Wikipedia