The higher an aircraft climbs, the lower the air density. Air density drops exponentially with altitude whilst drag increases only by its square. This essentially means that the higher an aircraft climbs in altitude, the faster the craft will go with the same amount of energy. At a certain altitude, super sonic speeds can be achieved with significantly less energy input in comparison to an aircraft at 35,000’ as it creates a force balance which occurs when an aircraft is not accelerating but rat...
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