Saturday, September 25, 2010

Allison J35

The Allison J35 was an axial-flow turbojet engine which was developed from the GE TG-180. Designed in 1946, the J35 was the first axial-flow compressor engine developed for the US Air Force to power the F-84 Thunderjet and the F-89 Scorpion. It consisted of an eleven-stage axial-flow compressor and a single-stage turbine. The J35 could produce a maximum thrust of 7,400 lbf. Although, it was originally designed by General Electric, the major production was by Allison.

The J35 first flew in the XP-84 in 1946. Late in 1947, complete responsibility for the production of the engine was transferred to the Allison Division of the General Motors Corporation. Some J35s were built by GM's Chevrolet division. More than 14,000 J35s had been built by the time production ended in 1955.

Specifications of the Allison J35

Type: Afterburning turbojet
Models: J35-A-11 (6,000 lb thrust); J35-A-15C (4,000 lb thrust); J35-A-35A (7,400)
Length: 23.8 ft
Diameter: 3.5 ft
Dry weight: 2,850 lb (1,293 kg) including afterburner
Compressor: 11-stage axial compressor
Turbine: Single-stage
Maximum thrust: 7,400 lbf (33 kN) with afterburner
Thrust-to-weight ratio: 2.60 (25.5 N/kg)
Maximum operating altitude: 50,000 ft (15,000 m)
Cost per unit: US$46,000