How fast can a 747 fly with tailwind?

The Boeing 747 Jumbo Jet reached a top speed of 825 miles per hour which was boosted by a strong jet-stream and tailwind of over 200 miles per hour. Aircraft that cross the Atlantic between North America and Europe flying eastbound are usually boosted by a tailwind that can shave several hours off their flight time.



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That flight set a record for the fastest subsonic transatlantic commercial airline flight — 5 hours and 13 minutes, thanks to a 202 mph tailwind. For reference, the speed of sound is 760 mph; but the plane did not break the sound barrier.

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Flight faster than sound was thought to be impossible. In fact, the sound barrier was only an increase in the drag near sonic conditions because of compressibility effects. Because of the high drag associated with compressibility effects, aircraft do not cruise near Mach 1.

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Its wings have a high sweep angle of 37.5° for a fast, efficient cruise speed of Mach 0.84 to 0.88, depending on the variant. The sweep also reduces the wingspan, allowing the 747 to use existing hangars.

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Can a 737 fly Mach 1? The maximum speed you could attain would depend on the airframe; MMO for the 737 is 0.82 Mach, so you're already having issues. Per the A320 TCDS the MMO of that airplane is also 0.82 Mach.

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Because headwind increases the lift, pilots prefer to land and take off in headwind. Tailwind is wind blowing from behind the aircraft. It reduces the lift and aircraft generally avoid taking off or landing in tailwind.

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Built in 1967 to produce the mammoth jet, it remains the world's largest manufacturing plant according to Boeing. But after five decades, customer demand for the 747 eroded as Boeing and Airbus (AIR.PA) developed more fuel efficient two-engine widebody planes.

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While the Boeing 747 carries more passengers and has a longer range, the 777X surpasses it in cargo capacity and fuel efficiency. The cost of operating the 777X is lower than the 747 due to newer technologies and larger engines, making it a better long-term investment for airlines.

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Many long-haul planes have pilot bunks. On some airplanes you have to pass through the passenger cabin to reach the bunks or lavatories; on others, like the 747, you need never leave the cockpit area and can move freely between the bunk and the bathroom in your pajamas.

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Underpowered and heavy The increased MTOW also led to problems for engine supplier Pratt& Whitney (P&W). Its innovative JT9D engine was designed to produce 41,000lb of thrust but would now need to generate an additional 1,000lb to propel the heavier 747 into the air.

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No airplane has ever gone this fast. The speediest airplane ever built is Lockheed's SR-71 Blackbird, which traveled at Mach 3.2. Anything above Mach 9 and you lose communications with the ground, as plasma starts enveloping the vehicle, as if it were a spacecraft returning to Earth through the upper atmosphere.

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