why flight never move backwards?

Answer 1

An airplane needs forward speed in order to generate lift. Aerodynamics 101: Lift is generated by faster moving air creating a low pressure area over the curved upper surface of a wing which is "pushed" up by the slower moving, higher pressure air under the wing.
Any airfoil will be thicker at the "forward" part of the wing than it is at the rear of the wing.
If an airplane tries to fly backwards the air is having to slow down because it is going "uphill" towards the thicker portion of the wing. The air cannot move as fast and therefore cannot generate the lift needed for the airplane to fly.
Helicopters, however, can fly backwards. This is possible because they don't have a fixed wing. The rotor is the wing of the helicopter. When a helicopter flies backwards the "tilt" (angle of attack) of the blades changes allowing it to fly backwards.

Answer 2

Most aircraft have a reverse thrust. Jet engines use this reverse thrust only on landing to slow them down. They aren't authorized to use it at the gate because of the hot air would blow towards the terminal. So they use a pushback system with small vehicles pushing them back and in the direction they need to go.


On most jets the engines indeed reverse, and that is exactly why you hear the "rev" just after meeting the pavement. The thrust is redirected by the deployment of deflectors. It's not a true reverse but more of an acutely angled, semi-forward vector like the effect of blowing into your cupped hand. If you're seated with a view of the engines, you can usually see this deployment quite clearly. Once in this condition, the engine's power is increased.

Turboprop engines can reverse as well. Most people aren't aware of it, but propeller blades are able to change angle, and they will twist to a setting that forces air forward rather than backward. Thus you'll hear a turboprop increasing its power after touchdown as well. (No, neither jets nor turboprops will reverse during flight.)

Answer 3

I personly witness an heloicourier land back wards in a wind of 35 knots.
This aircraft has a stall speed of 32 knots with flaps down.
This pilot cant in over the runway and slowed the power and the wind coming down the lenght of the runway was keeping him in the air.he slowed the power even more and started to move backwards in relation to the ground but was still moving forward in relation to the air coming down the runway.he landed backwards.

Answer 4

If you meen in flight an airplane can move backwards. If your flying into the wind and in what is called slow flight(Minimum controllable airspeed for your aircraft) and the wind is blowing faster than you are flying the aircraft will move backwards over the ground.

Answer 5

Actually it can move backward in ground. But the wings are designed to produce the lift when the airplane move forward so normal airplane can not fly backward.( Sea-harrier is a kind of jet plane can fly backward but it's principle is very different.pilot control the direction of jet blast to produce lift to the opposite direction

Answer 6

It's all to do with the way the airflow goes over the wing. If you went backwards you wouldn't get as much lift! Be too expensive and a little pointless to have a wing that alters it's shape to go backwards. But do-able if you're up to the challenge!

Answer 7

Aeroplane flies on the basis of speed and to go backwards means you will have to reduce and stop in air that is not possible as such you can only turn by cirling and go backwards to fly plane backwards is not possible as the shape of the plane can not be changed,even if you change the direction of the engines.

Answer 8

Airplanes do not have to move forward to fly. They have to have a forward airspeed. I have flown back wards in the air because of strong headwinds. You can fly into the wind but are moving backwards over the ground.

Answer 9

Well, I actually DID fly a Piper J3 Cub "backwards" once. At 45 knots head-on into a nearly whole gale wind we were moving backwards at a few knots. That was a scary day!

Answer 10

airplanes do not move backwards because the engines are not designed to move it backwards. although, there have been some reports of planes using reverse thrust to push back from the gate, although i believe this is not allowed at airports.