how fast does a plane go on the runway before it takes off?

Answer 1

Depends on the aircraft.

Most airliners reach takeoff speed at around 150-180 mph
Light aircraft usually take off at around 60mph
Military aircraft vary enormously (Harrier jump jets require no forward speed at all to take off)

The actual takeoff speed of a given aircraft varies according to factors such as air density, aircraft gross weight, and aircraft configuration (flap and/or slat position, as applicable). Many aircraft use devices such as slats or flaps to increase lift during takeoff which enables them to take off at a lower speed than would otherwise be possible.

The speed required is also influenced by the wind speed and direction - in other words the speed we are talking about is speed through the air, not over the ground, as this will dictate how much lift the wings can generate. To give a simplified example, if an aircraft normally takes off at 100mph when there is no wind then it only needs to reach 90mph ON THE GROUND if it is taking off into a 10mph wind.

Answer 2

Most airliners takeoff around 130 -160 knots. However the speeds for takeoff are determined by the amount of flap your using (a larger wing surface provides greater lift) and the temperature outside. As you may know aircraft dont use full power during takeoff to save engine life and wear. If it is extremely hot outside (100+ F) the pilot will use full power takeoff's and actually run the APU (Auxiliary Power Unit) to supply to air conditioning and electronics so that the engines are putting more thrust out. The most important factor for the speed an aircraft takes off at is it's gross weight. The on-board computer or FMC usually determines these speeds, just enter your weight into this handy tool and the speeds are automatically calculated and show up on your speed indicator. On the takeoff roll at 80 knots the co pilot will call out "80 knots" which tells the captain to cross reference the main gauges, at V1(Which is also called out), the speed usually 5 knots below VR, or rotation speed, the takeoff MUST continue. It's basically the point of no return, hopefully everything is fine and your takeoff speed determined by the computer which again is around 130 - 160 knots the co pilot calls out "rotate" and the plane gently eases into the sky..

Answer 3

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In very simple terms, it's to make air go around the wings fast enough to allow the plane to take off. Slightly more complicated - aeroplane wings are designed so the air flows at different speeds around the top and bottom of the wings. This results in a pressure difference which causes lift. The air has to be moving pretty fast to create this pressure difference, hence the acceleration run along the runway.

Answer 4

here ya go

Q: What speed do large passenger jetliners usually build up to on the runway before they take off?

A: Jetliners typically takeoff at 160 to 180 mph (260 to 290 km/h), though it depends on how heavily the plane is loaded and whether the pilot is using flaps or slats. These devices increase the plane's lift so it can take off at slower speeds.

When I say "speed" I mean airspeed (relative to the air). So, theoretically, a plane could just sit there and take off into a 160 mph wind. It would take a strong hurricane to create this wind.

Airspeed is critical because it provides lift. That's why planes take off into the wind: to maximize airspeed. The wind hits the up-tilted wings and tail and flows down - the path of least resistance. The air exerts an equal and opposite-upward-force on the wings and tail. The plane rises due to this lift.

Aircraft carriers maneuver so their deck is pointed into the wind as much as possible when launching and retrieving fighter planes. They catapult 45,000-pound planes (20,400 kg) into the sky at takeoff speeds of 165 mph (266 kg/h)-reaching those speeds in two seconds!

---http://www.usatoday.com..

Answer 5

Depends on the plane. Cessna 150, King Air Turbo Prop, DC-11,
747. All take off at diffrent ground speeds, enviormental factors play a big role in taking off, also weight of AC and length of runway. If the AC runs off the end of the runway it wasnt going fast enough.

Answer 6

It has to move real fast to gain the attention of G-d, who reaches down and picks up the airplane and carries it to the airport where it wants to go. Okay, that was a flippant answer, sorry, I just got through answering about why G-d made insects. (Just to let you know, the answer above is the sort my Sunday School teachers would have given me when I was a kid. They were full of cr-p). Tell her, um, uh, er... well, hm. You see, the wings need to be moving with respect to the air around them to generate lift. So, the planes move on the runway to give the wings a lot of airspeed, enough so they can lift the heavy airplane into the air! And the airplane has to have really powerful engines and burn up a whole lot of fuel to make it go so fast!

Answer 7

Aircraft Takeoff Speed
Boeing 737 150 mph

Boeing 757 160 mph


Airbus A320 170 mph


Airbus A340 180 mph


Boeing 747 180 mph



Concorde 225 mph

Answer 8

There are a lot of answers on here thar reference size. Actually size has nothing to do with it. It is all a matter of thrust, drag and lift. The more thrust and more wing surface area (lift), the slower it has to go. The more weight (drag) the more speed it needs.
If you take a C5 Galaxy for example - it's one of the largest aircraft in the world but it can take off at less than 75 mph.

Answer 9

Depends on the size of the aircraft.

I'd say 737s and up go about 130-140 knots.

Cessnas and little planes like that generally about 50-70 knots.

Answer 10

It depends on the type of aircraft, Light aircraft may get airborne at 130-150 kph
and bigger may take 200-250 kph.