NASA believes test jet hit Mach 7
Three years after its first test flight ended in an explosion, NASA on Saturday successfully launched an experimental jet that the agency believes reached a record-setting speed of about 8000 kph.
Flight engineer Lawrence Huebner said preliminary data indicated the needle-nosed jet reached a maximum speed of slightly over seven times the speed of sound after a rocket accelerated it.
Huebner said it was the first time an "air-breathing" jet had ever traveled so fast. The rocket-powered X-15 reached Mach 6.7 in 1967.
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