The Douglas D-558-1 Skystreak and D-558-2 Skyrocket were, with the
Bell XS-1, the earliest transonic research aircraft built in this
country to gather data so the aviation community could understand
what was happening when aircraft approached the speed of sound
(roughly 741 miles per hour at sea level in dry air at 32 degrees
Fahrenheit). In the early 1940s, fighter (actually, in the terms of
the time, pursuit) aircraft like the P-38 Lightning were
approaching these speeds in dives and either could not get out of
the dives before hitting the ground or were breaking apart from the
effects of compressibility-increased density and disturbed airflow
as the speed approached that of sound and created shock waves.
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