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Researchers have proposed using the Air Force’s X-37B as an ambulance in space.
Halberg said that an effective astronaut taxi should, among other things, be able to stay at the ISS for two years or more at a stretch; be capable of getting people back to Earth rapidly, within three hours or so; impose minimal G-loads on occupants; have the ability to land close to a hospital; and allow patients to lie in a supine position. These requirements all point to a space plane rather than a capsule, Halberg said — meaning SpaceX’s Dragon capsule and Boeing’s CST-100 capsule, which are scheduled to start flying NASA astronauts to and from the ISS within the next year or two, wouldn’t make the grade as ambulances.
Another private crew-carrying vehicle that’s currently in development, Sierra Nevada Corp.’s Dream Chaser space plane, is an intriguing option that bears further investigation, Robinson and Halberg said. But their initial concept study focused on the robotic X-37B, chiefly because the 29-foot-long (8.8 meters) military space plane has already racked up millions of miles in orbit, while Dream Chaser has yet to launch.
Makes sense, though once Dream Chaser is flying it will have the potential to provide the same service with far greater capabilities.