The XF-90, a supersonic fighter, was the first Lockheed aircraft to exceed the speed of sound. This title examines the design criteria of the 1945 penetration fighter request-for-proposal and the eight companies that presented proposals. Lockheed created over 60 design studies for the XF-90, which are covered in the book. The text also explores its development, flight testing at Muroc/Edwards AFB, and the history of the second XF-90's involvement in the nuclear testing at the Nevada Test Site. 168 pages, 212 b/w & 68 color photos, 90 illustrations, 8 ½"x 11", softcover.