The Convair 880 used a turbojet version of the same engine which was based on the military J79 turbojet that powered several high-performance types including the B-58 Hustler, F-104 Starfighter and F-4 Phantom (exept F-4s built for the RAF which used the R-R Spey turbofan).
The turbofan version on the Convair 990 was unusual in having the fan at the rear of the engine rather than at the front.
faro From Egypt, joined Aug 2007, 1556 posts, RR: 0
Reply 3, posted (4 years 6 months 1 week 6 days 17 hours ago) and read 2622 times:
Quoting Viscount724 (Reply 1): The turbofan version on the Convair 990 was unusual in having the fan at the rear of the engine rather than at the front.
The J79 on which the CJ-805-23 was based was state of the art for its time but retained a single spool. In order to make it more efficient, "piggy-back" fan stages were installed at the rear of the engine, mounted directly on the outer edges of the turbine stages and hence driven by their residual torque. It was the only way to economically enhance performance of the J79 for civil use; otherwise GE would have had to basically redesign the engine with a conventional 2-spool layout.