„Hiperszonikus áramlás” változatai közötti eltérés

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During the 1980s, NASA began considering a hypersonic single-stage-to-orbit (SSTO) vehicle to replace the Space Shuttle. The proposed National Aerospace Plane (NASP) would take off from a standard runway using some kind of low speed jet engine. Once the aircraft had reached sufficient speed, air-breathing ramjet or scramjet engines would power the aircraft to hypersonic velocities (Mach 20 or more) and to the edge of the atmosphere. A small rocket system would provide the final push into orbit, but the attractiveness of the concept was using the atmosphere to provide most of the fuel needed to get into space. NASP eventually matured into the X-30 research vehicle, illustrated below, which used an integrated scramjet propulsion system.
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* [[1990]]-ben az [[X–38]] legénysége folytatta az X-23 és X-24 gépekkel megkezdett kísérleteket. Ez a [[Nemzetközi Űrállomás]]ról való mentésre is alkalmas lett volna.