Code One Magazine: The X Planes, X-4

X-4
Mission: The X-4 was designed to explore the transonic flight characteristics of tailless aircraft. Diminutive in all respects, it proved one of the more successful flight test vehicles of its day. Maximum speed effectively was limited to Mach 0.88. Power was provided by two Westinghouse J30-WE-7 turbojet engines.

Manufacturer: Northrop Aircraft Corporation
Number Built: 2
Sponsor: USAF, NACA
Fastest Flight: 0.90 Mach (630 mph approx.)
Highest Flight: 42,300 feet
First Flight: 16 December 1948
Last Flight: 29 September 1953
Total Flights: 102
Length: 23 feet 3 inches
Wingspan: 26 feet 9.25 inches
Height: 14 feet 9.25 inches
Gross Weight: 7,820 lb

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