BY THE NUMBERS

Number built: 3

Number preserved: 2

Program Active: 1955-1968

First Flight: June 8, 1959

Weight at Launch: 31,275 pounds

Length: 50 ft.

Wingspan: 22 ft.

Height: 13 ft.

Wing Area: 200 sq. ft.

Sweep: 25 deg.

Number of Flights: 199

Maximum Altitude: 354,330 feet

Maximum Speed: 4,534 mph, Mach 6.72