What is the Speed needed for a jumbo jet to lift off?

Answer 1

The average speed of a jumbo jet is around 180 miles per hour. For a jetliner to takeoff in the distance given on an average 12,000 ft runway the flaps need to be retracted to 45-75%, both on the leading and trailing edges of the wing. These flaps increase the area of the wing and the shape of the wing is then capable of lifting off at low speeds with enough lift to takeoff. The only way an aircraft can get airborne is if the pilots pull the nose of the aircraft up with the help of ailerons at the end of the aircraft. these ailerons direct air downward, so the end of the aircraft goes down an so the nose of the aircraft goes up. The pilots pull the nose of the aircraft up at 15-25 degrees angle of attack usually. To get to 180 mph jumbo jets apply full throttle or slightly less. If the pilots didn't put the flaps down and didn't pull the plane up, the aircraft would have had to travel at cruise speed (575 mph) on the runway to takeoff!