Venture Star - Venture Star Launch Vehicle Credit: © Mark Wade. 3,887 bytes. 404 x 391 pixels.

NASA-sponsored suborbital unmanned prototype for single stage to orbit winged spacecraft. Lockheed Martin vehicle will use linear aerospike engines, metallic insulation, other features similar to their Starclipper shuttle proposals of 1971.

to a: Instrumentation in 1.5 x 3 m bay to Mach 15. trajectory. Liftoff Thrust: 185,900 kgf. Total Mass: 123,800 kg. Core Diameter: 20.7 m. Total Length: 20.4 m.

• Stage Number: 1. 1 x X-33 Gross Mass: 123,800 kg. Empty Mass: 28,600 kg. Thrust (vac): 233,000 kgf. Isp: 439 sec. Burn time: 886 sec. Isp(sl): 339 sec. Diameter: 20.7 m. Span: 20.7 m. Length: 20.4 m. Propellants: Lox/LH2 No Engines: 2. XRS-2200

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Venture Star - Venture Star Launch Vehicle 3 View Credit: © Mark Wade. 5,076 bytes. 627 x 443 pixels.

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X-33 Douglas - McDonnell-Douglas X-33 Credit: NASA. 20,208 bytes. 394 x 276 pixels.

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X-33P4 Credit: NASA. 20,182 bytes. 394 x 315 pixels.

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X-33 Proposal Credit: NASA. 9,637 bytes. 377 x 167 pixels.

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X-33 Douglas - X-33 McDonnell Douglas proposal Credit: NASA. 7,730 bytes. 383 x 267 pixels.

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X-33 Rockwell - X-33 Rockwell proposal Credit: NASA. 17,232 bytes. 380 x 273 pixels.

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