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If you have a tailwind of 150 miles per hour can a 747 jumbo jet actually register faster than 700 miles an hour?
Wiki User
∙ 15y ago
Yes, the cruise speed of a Boeing 747 is Mach 0.85 (567 mph or 913 km/h) and will maintain that in the air it is travelling. If there is a tail wind like in a jet stream of 150 miles per hour then the plane will be covering 717 miles per hour relative to the ground.
The sound barrier is about 761 mph at sea level but 660 mph at cruising altitude! While the relative speed doesnt count, a 747 will slow down anyway for safety precautions in the case it escapes the wind funnel but still take some advantage of the speed. This way a flight Frankfurt to New York is usually against wind 8 hours 20 minutes while a flight New York to Frankfurt with the usual tail winds is only 7 hours 25 minutes!
A China Airlines 747 almost broke the sound barrier during a steep unplanned descent after an in-flight upset on February 19, 1985.
Wiki User
∙ 15y ago
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