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however the boom as you break the sound barrier. European hypersonic jets would fly over the North pole
and Boeing to design airplanes that break the sound barrier more quietly. From 2020 to 2025 it may be possible that airplanes could then exceed the sound barrier over populated land without causing a major disturbance.
In Europe, Steelant team tested their 300-seat design albeit a 1: 120 scale model, at speeds of Mach 8 within a wind tunnel.
which describes a craft that climbs vertically into the air before breaking the sound barrier as it travels horizontally across the sky.
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