Lockheed XF-90
     The XF-90, like the McDonnell XF-88, was developed to meet a USAF
 requirement for a long-range "Penetration Fighter." Two prototype
 aircraft were built (S/N 48-687 and 48-688), the first was powered by
 two Westinghouse J34 turbojets without afterburners, but these proved
 inadequate. The second aircraft was adapted for afterburning J34s and
 had better, but not great performance. The outbreak of the Korean
 Conflict prompted to USAF to seek increased production of currently
 available aircraft and XF-90 never entered production.
     The XF-90 had two unusual features. The first was the location of
 the cannon ports located below the engine air intakes in a horizontal
 row, three on each side. The second was the variable incidence empen-
 nage. The vertical stabilizer could be tilted back and forth along
 the longitudinal axis for horizontal stabilizer adjustment.
 TYPE      Number built/Converted             Remarks
 XF-90                2                  Penetration fighter
 SPECIFICATIONS
 Span: 40 ft. 0 in.
 Length: 56 ft. 2 in.
 Height: 15 ft. 9 in.
 Weight: 27,200 lbs. loaded
 Engines: Two Westinghouse J34-WE-15 turbojets of 4,100 lbs. thrust
          each with afterburner.
 Armament: Designed for six 20 mm cannons, eight 5-inch HVAR rockets
           and up to 2,000 lbs. of bombs
 Crew: One
 PERFORMANCE
 Maximum speed: 665 mph
 Cruising speed: 473 mph
 Range: 2,300 miles
 Service Ceiling: 39,000 ft
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