Orbital Sciences Corporation X-34 3D model

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The X-34 was a technology demonstration vehicle for a reusable orbital launch system, developed by Orbital Sciences Corporation in cooperation with NASA (and briefly Rockwell). It was a suborbital air-launched spaceplane, designed to reach speeds of up to mach 8 in rocket-powered flight, and be reusable dozens of times. It would be deployed from an L1011 carrier aircraft. Two X-34 vehicles were partially built, but never flown by the time of the program's cancellation. Had the program continued, future evolutions of the X-34 would have added an expendable upper stage capable of carrying a payload to orbit