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General Electric CJ805 / TF35


A CJ805-3A turbojet installed on a Convair 880 airliner


The General Electric CJ805 is a jet engine which was developed by GE Aviation in the late 1950s. A simplified civilian version of the J79 featuring an axial compressor, it was developed in two versions. The basic CJ805-3 was a turbojet and powered the Convair 880, while CJ805-23 (military designation TF35), a turbofan derivative, powered the Convair 990 airliners.




Variants and applications:

Convair 880

Convair 880-22 : Revised variable inlet guide vane and stator control.

Convair 880-22M : Increased thrust.

Flight testing in a Douglas RB-66: Aft-fan variant with a direct drive fan attached to a free-running LP turbine.

Convair 990

Intended for the proposed Sud Aviation Caravelle 10A
Only a single Sud Aviation Caravelle intended as a prototype for the US market, was equipped with the CJ805.



Type: Single-spool turbojet
Length: 188.9 in (4,798 mm) with thrust reverser/suppressor
Diameter: 31.6 in (803 mm)
Dry weight: 3,213 lb (1,457 kg) with thrust reverser/suppressor
Compressor: 17-stage axial flow
Combustors: can-annular
Turbine: 2× gas generator power stages + 1× free running turbine with fan blades on the periphery
Fuel type: Aviation kerosene
Oil system: pressure spray/splash
Maximum thrust: 11,650 lb (5.28 kN) for take-off
Overall pressure ratio: 13:1
Specific fuel consumption: 0.75 lb/lb·hr (76.45 kg/kN·hr) at max. continuous rating
Thrust-to-weight ratio: 3.626 lbf/lb (0.356 kN/kg)



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