A modified Boeing jet transport aircraft used by NASA for weightless training. The four-engine plane flies in parabolas, which produces 25 to 30 seconds of weightlessness over the top of the course. At this time, astronauts (who have named the plane the ‘Vomit Comet’) practice using different types of space shuttle equipment, as well as eating and drinking. Each week there are normally four flights of 40 parabolas each, with training sessions lasting between one and two hours. The KC-135 is also used for zero-gravity experiments.
http://jsc-aircraft-ops.jsc.nasa.gov/kc135/index.html Describes the KC-135 aircraft used for microgravity research and astronaut training. As well as technical and safety information, there are diagrams, photographs, and links to other sites with more information about the aircraft.
Subjects: Astronomy and Astrophysics.