George Ruch wrote:

I remember what may be the same picture, a DC-9 fitted with a
high-bypass turbofan, and multiple scimitar-shaped fan blades
extending from the first-stage fan. Damned if I can find it now,
though. Nothing like it so far on the NASA Dryden site. Any other
ideas?

They called in an unducted fan or ultra-high bypass turbofan.

Pictures:

http://www.b-domke.de/AviationImages/Rarebird/0809.html

http://www.nurflugel.com/Nurflugel/NASM/Img0052.jpg

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