Code One Magazine: The X Planes, X-21

X-21
Mission: The X-21A was optimized to explore the feasibility of employing boundary layer control on large production aircraft. It was built using primary parts from a Douglas B-66. Two General Electric J79-GE-13 turbojet engines provided power.

Manufacturer: Northrop Corporation
Number Built: 2
Sponsor: USAF
Fastest Flight: 560 mph (approx.)
Highest Flight: 42,500 feet (approx.)
First Flight: 18 April 1963
Last Flight: 1964
Total Flights: many
Length: 75 feet 2 inches
Wingspan: 93 feet 6 inches
Height: 25 feet 6.5 inches
Gross Weight: 83,000 lb

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