In 1956, based on the commercialized CJ805-3 version of the military J79 turbojet then powering the Convair 880, GE began development of an aft fan engine, the J79-X220, later designated CJ-805-23. This uncomplicated and low cost development increased take-off thrust by 40 percent, lowered specific fuel consumption by 15 percent, and reduced takeoff and landing noise. The engine became the first U.S. turbofan and, on the Convair 990 in the 1960s, the first in the world to enter airline service.

Because American Airlines wanted a competitive edge, it had asked Convair to develop a larger and faster version of the Model 880. Although the Model 990's design speed was Mach 0.91, just under the speed of sound, relatively few sales were made of it or the Model 880, and a demonstration of the C805-23 on a Caravelle airliner was also an unsuccessful venture. However, the engine did provide GE experience for the corporation's future commercial aircraft engine business.

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Date Circa 1970s Country of Origin United States of America Type PROPULSION-Turbines (Jet) Manufacturer General Electric Aircraft Engines
 Physical Description Type: Turbofan Thrust: 71,612 N (16,100 lb) at 7,684 rpm Compressor: 17-stage axial, single-stage aft-fan Combustor: Cannular Turbine: 3-stage main, 1-stage free Weight: 1,724 kg (3,800 lb) Dimensions Length 332.5 cm (130.9 in.), Diameter 80.3 cm (31.7 in.)
 Materials Aluminum, Paint, Steel, Inconel, Plastic, Magnesium, Rubber, Stainless Steel
 Inventory Number A19760792000 Credit Line Gift of American Airlines Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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