# How does an aircraft lift off the ground?

## How does an aircraft lift off the ground?

A plane flies through the air by continually pushing and pulling the surrounding air downward. In response to the force of moving the air down, the air pushes the airplane upward. Newton’s 3rd law of motion states that for every action there is an equal and opposite re-action.

How do airplanes move on the ground?

When the pilots squeeze the thrust levers forwards, the thrust generated from the engines pushes the aircraft forwards. The wheels merely turn under this forward power allowing the aircraft to move.

### How does a Boeing 747 create lift?

An airplane wing is shaped so that air (which is a fluid) moves faster over the top of the wing than it moves under the bottom of the wing. As a result, there is greater pressure underneath the wing than there is on the top of the wing, resulting in a net force which “lifts” the wing.

How is lift generated?

Lift is generated by the difference in velocity between the solid object and the fluid. There must be motion between the object and the fluid: no motion, no lift. It makes no difference whether the object moves through a static fluid, or the fluid moves past a static solid object. Lift acts perpendicular to the motion.

#### Do airplanes stand still in the air?

Techincally, there is only one way for the aircraft to remain hanging motionless in the air: if weight and lift cancel each other out perfectly, and at the same time thrust and drag cancel each other out too. But this is incredibly rare. To stay in the air and sustain its flight, an aircraft needs to be moving forward.

Can a plane reverse on the ground?

Planes move by pulling or pushing themselves through the air, rather than by applying engine power to spin their wheels, and thus have no forward or reverse gears. Like ground vehicles’ engines, the aircraft’s engines can’t run backwards.

## How do planes turn left and right on the ground?

The ailerons raise and lower the wings. The pilot controls the roll of the plane by raising one aileron or the other with a control wheel. Turning the control wheel clockwise raises the right aileron and lowers the left aileron, which rolls the aircraft to the right. The rudder works to control the yaw of the plane.

What speed does a Boeing 747 take off and land?

A look at the speed the at which the Boeing 747 takes off and lands What speed does a Boeing 747 take off at? A fully loaded Boeing 747 ‘Jumbo Jet’ on a normal long haul flight would take off at a speed of around 160 knots which is 184 mph. The calculated take-off speeds vary depending on environmental conditions, runway length and weight.

### How fast does a jumbo jet take off?

A fully loaded Boeing 747 ‘Jumbo Jet’ on a normal long haul flight would take off at a speed of around 160 knots which is 184 mph. The calculated take-off speeds vary depending on environmental conditions, runway length and weight.

What is the best flap setting to land a jet?

The greater the flap setting, the lower the take-off and landing speed. Jumbo Jets typically land at Flap 25 or 40. Pilots generally fly the approach speed faster than the actual touchdown speed to allow a speed ‘buffer’ in case of any airspeed fluctuations.

#### How do Airlines de-rate thrust for take-off?

Most airlines and aircraft have a facility to de-rate thrust (or use assumed temperatures) for take-off. This occurs on runways where the aircraft has extra performance in hand e.g. the aircraft does not need the full length of the runway to take-off.