VentureStar

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VentureStar was a planned reusable space vehicle from Lockheed Martin, funded by the U.S. government. It was meant to be a single‑stage‑to‑orbit, reusable spaceplane that could launch satellites into orbit at a much lower cost than the Space Shuttle.

The plan was to launch VentureStar vertically and have it return to Earth as an airplane. It would carry about 20 metric tons (20,000 kg) to low Earth orbit and was designed to land at major airports. The vehicle stood about 38.7 meters tall, was 39 meters in diameter, and weighed around 1,000 metric tons.

Key technology included seven RS‑2200 linear aerospike engines running on liquid hydrogen and liquid oxygen, no solid rocket boosters, and a metallic thermal protection system. This design aimed for simpler maintenance, lower environmental impact (its exhaust would be mainly water vapor), and safer operations. The goal was to cut the cost of sending payloads to orbit to about $2,000 per kilogram, roughly one‑tenth of the Space Shuttle’s cost.

VentureStar would have been launched from Kennedy Space Center and flights would be leased to NASA as needed. The program was canceled in 2001 due to high development costs and technical problems uncovered during the X‑33 test program, which was intended to prove the necessary technologies. A major setback was a failure in testing the hydrogen fuel tank design, which used advanced composite materials and suffered from moisture and air entering the tank.

Despite its cancellation, VentureStar influenced later thinking about reusable spaceflight and the development of carbon‑fiber tanks and other related technologies. The project never flew, but it remains a notable example of the push for cheaper, reusable access to space.