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Additional
X-15
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North American X-15
The
North American X-15
was a
hypersonic
rocket-powered aircraft
operated by the
United States Air Force
and the
National Aeronautics and Space Administration
as part of the
X-plane
series of
experimental aircraft
. The X-15 set speed and altitude records in the 1960s, reaching the
edge of outer space
and returning with valuable data used in
aircraft
and
spacecraft
design. , the X-15 holds the
official world record
for the highest speed ever reached by a manned, powered aircraft. Its maximum speed was , or Mach 6.72.
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