2006-12-20 19:13:36 · 10 answers · asked by suryanarayanan u 3 in Science & Mathematics ➔ Engineering
An airplane, like a helicopter, needs lift to stay in the air. In planes, their wings are fixed to the fuselage, which does not allow any movement of the wings. The plane relies on the engines to move the plane fast enough to create the lift needed to stay airborne.
In helos, however, the wings are the rotors. The rotors are moving constanatly, creating lift. If you looked at a helo rotor, you would find that they are not flat. They are slightly slanted. The degree of slant can be controlled by the pilot, which will control what the aircraft does while it is in the air.
Even though it appears that the helos are staying put in the air, it would be impossible for them to stay in one place for an extended period of time. Doing this would create rotor wash, or loss of lift.
2006-12-20 19:21:03 · answer #1 · answered by Brandon W 5 · 1⤊ 0⤋
An aeroplane requires air to pass quickly over the wings to produce lift in order for the plane fly. In order to do that, it must maintain forward motion, which is propelled by the propeller or some other forward method of propulsion.
In a helicopter, the propeller (rotor) acts to propel the helicopter upward instead of forward. Since gravity is trying to pull the helicopter downward, it is able to stand still in air simply by balancing the upward force of the rotor against the downward force of gravity.
2006-12-20 19:20:57 · answer #2 · answered by Schlermie 3 · 0⤊ 1⤋
Both require movement of air over the wing surface to generate lift. In an airplane, the wing surface is fixed, so the airplane as a whole must move through the air rapidly enough to provide enough lift to maintain height (or at least to lose it in a gentle sort of way!). In a helicopter, the wing surface itself moves, so the helicopter itself doesn't have to move through the air; all that needs to be done to generate sufficient lift is to turn the blades fast enough.
2006-12-20 19:17:51 · answer #3 · answered by Scarlet Manuka 7 · 0⤊ 0⤋
In order for either to stay up they need to have air moving through the wings ( blades in teh helicopter). Since the blades of the helicopter are always moving the air is always moving around it, whereas in order for an airplane wing to have air moving around it the whole plane must be moving
2006-12-20 19:19:05 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Aeroplanes hav wings which need air at a certain rate of speed to pass over it to generate lift( the bigger the aeroplane the more speed u need to generate that lift) wearas helicopters hav spinning rotors that produce the lift by blowing the air from top to bottom and the more it spins the more thrust of air it produces enuf to over come its weight and lift off.
2006-12-20 22:11:01 · answer #5 · answered by Gandalf 6 · 0⤊ 0⤋
There is a reson for this that the blade shape.
The helicop. have 1 fan in the upper side its blade are made in such a shape that can stay the hel. in the same position.
The blade of helicopter is made with some angle like 15 degree, from this when the fan round , it send air in the down side and as neutan second laws say the thing is same in this condition also. The fan blade push the air down side and the air push it in the upper side.
Whereas the plane not have such fan which, it have side fans and front fan. It not have any fan for stay it in the ar.
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2006-12-20 19:50:39 · answer #6 · answered by james b 3 · 0⤊ 0⤋
both require motion to make a differnce in pressure on the wings (or rotors) to get lift. the plane must move along to pass air across it's specially designed wings. creating less pressure above because of how air flows around the wing. making it go up. Helicopter has that special air flow across it's blades which do move but go round and round. creates different pressure on the blades and lifts up.
odd really how you just create a pressure difference in a small space right above and below the wing which allows for lift.
2006-12-20 19:21:56 · answer #7 · answered by Anonymous · 0⤊ 0⤋
The Harrier Jump Jet can hover like a helicopter. It can do that because the engines are installed in such a way that they can swivel to provide the downward thrust required to hover.
Most aeroplanes have engines that are mounted to provide horizontal thrust, and therefore can't hover.
2006-12-20 19:27:35 · answer #8 · answered by Anonymous · 0⤊ 0⤋
Cause the wings on a helicopter go round and round.
2006-12-20 19:22:33 · answer #9 · answered by Anonymous · 0⤊ 0⤋
because of its shape & dynamics
2006-12-20 19:42:08 · answer #10 · answered by rash 2 · 0⤊ 0⤋