How fast does a plane need to take off?

The speeds needed for takeoff are relative to the motion of the air (indicated airspeed). A headwind will reduce the ground speed needed for takeoff, as there is a greater flow of air over the wings. Typical takeoff air speeds for jetliners are in the range of 240–285 km/h (130–154 kn; 149–177 mph).



A commercial jetliner typically needs to reach an airspeed between 240 and 285 km/h (150 to 180 mph) to generate enough lift for takeoff. The exact speed, known as Vr​ (rotation speed), varies significantly based on several factors: the weight of the aircraft (fuel and cargo), the flap settings, the outside air temperature, and the altitude of the airport. For example, a massive Boeing 747 fully loaded for a transoceanic flight will require a much higher takeoff speed and a longer runway compared to a smaller regional jet like an Embraer 175. Air density is also a critical factor; at high-altitude airports like Cusco or Denver, or on extremely hot days when the air is "thin," the aircraft must travel faster over the ground to achieve the same amount of aerodynamic lift. Pilots meticulously calculate these V-speeds (V1​, Vr​, and V2​) before every departure to ensure the plane can safely clear the runway and any obstacles in its path.

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A typical takeoff speed for a Boeing 747 is around 160 knots (184 mph), depending on the jet's wing flap configuration, the number of passengers aboard, and the weight of their luggage, fuel load, current weather conditions, and other factors.

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Technically this is the so-called 'stall speed', where air passes over the wings fast enough to sustain altitude, and for small planes this can be less than 50km/h (31mph). But at such low speeds, the aircraft is easily destabilised, and could fail to leave the runway.

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Landing. While landing, speed is largely affected by the aircrafts current weight, commercial airplanes typically land between 130 and 160 mph (112 to 156 knots).

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Aeroplanes are made to run on the runway before take off, so that they acquire the necessary lift.

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As the plane descends into ground effect, it may actually accelerate if the engines are producing enough thrust, since in ground effect the plane requires much less power to keep flying. Power from the engines will translate into speed, if not height.

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The biggest reason for flying at higher altitudes lies in fuel efficiency. The thin air creates less drag on the aircraft, which means the plane can use less fuel in order to maintain speed. Less wind resistance, more power, less effort, so to speak.

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Yes, and no. Aircraft normally fly at an optimal indicated airspeed until they reach their optimal climb/cruise Mach. This transition from airspeed to Mach normally occurs in a transition zone of around 27000 - 30000 ft.

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For example, with a glide ratio of 15:1, a Boeing 747-200 can glide for 150 kilometres (93 mi; 81 nmi) from a cruising altitude of 10,000 metres (33,000 ft).

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Airplane wings are shaped to make air move faster over the top of the wing. When air moves faster, the pressure of the air decreases. So the pressure on the top of the wing is less than the pressure on the bottom of the wing. The difference in pressure creates a force on the wing that lifts the wing up into the air.

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A Boeing 747 has a cross height of 35,105 ft, while the Embraer climbs 190 to 39,370 ft. The Airbus A380 can even fly at 43,097 ft.

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Whether flying at night or during the day, pilots need to see some kind of horizon. They use this to determine the airplane's attitude. At night pilots will turn their gaze from outside to inside and use the artificial horizon. The artificial horizon is normally a simply globe split into two hemispheres.

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2 Many pilots plan for a higher cruising altitude at night, simply because suitable emergency landing sites may be fewer and farther between. The difference between cruise at 8,500 and 10,500 feet may not seem like much until you have to glide back to Earth at 800-900 fpm without power.

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The bumps you experience during take off, landing and while clearing clouds is a caused by either of the two turbulence types. Add to that the speed of the airplane cutting through dense air at lower altitudes, and some bumps are expected as well as entirely normal.

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A lot of airports have restrictions on night flights because of noise issues. Also some smaller domestic airports close at night. There are a few that leave late at night in order to take advantage of the time difference in the arrival city. There aren't more because there isn't much demand for them.

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While fuel dumps don't happen every day, they're also not uncommon. Nor do they usually represent a major emergency. In fact if an aircraft is taking the time to dump fuel before landing, that's likely an indication that the issue forcing the plane to land is serious but not critical.

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In the event of an engine malfunction, the recognition of a significant abnormality, or an ATC instruction to stop the aircraft during the take off roll, transport aircraft in Performance Category 'A' should be able to safely reject the take off if the decision to do so is made at a speed not greater than the correctly ...

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