Mission: The X-40A is a ninety percent scale model of a proposed Space Maneuver Vehicle (SMV) study conducted by Boeing during the mid-1990s. It is now considered to be a subsonic aerodynamic testbed for the X-37A, which in turn has become the true testbed for the original SMV. The X-40A is unpowered, though a powered version referred to as the X-40B is rumored to be under development.

Manufacturer: Boeing Company
Number Built: 1
Sponsor: USAF
Fastest Flight: 100 mph
Highest Flight: 9,000 feet
First Flight: 11 August 1998
Last Flight: 11 August 1998
Total Flights: 1
Length: 22 feet 0 inches
Wingspan: 11 feet 6 inches
Height: 7 feet 2.5 inches
Gross Weight: 2,746 lb

X-1 (First Generation) • X-1 (Second Generation) • X-1E
X-2 • X-3 • X-4 • X-5 • X-6 • X-7 • X-8 • X-9 • X-10 • X-11 • X-12 • X-13 • X-14
X-15 • X-15A2 • X-16 • X-17 • X-18 • X-19 • X-20 • X-21 • X-22 • X-23 • X-24A
X-24B • X-25 • X-26A • X-26B • X-27 • X-28 • X-29 • X-30 • X-31 • X-32
X-33 • X-34 • X-35 • X-36 • X-37 • X-38 • X39
X-40 • X-41 • X-42 • X-43 • X-44 • X-45

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