How does a helicopter create lift?

Answer 1

just go here...it will explain everything.

Answer 2

Newton's third law states that for every action there is an opposite and equal reaction.

The blades of a helicopter are pitched so that as they rotate they displace air, forcing it downward toward the ground. The pitch usually isn't too great, mainly because it wouldn't be efficient to increase the pitch beyond 33 degrees. If you do then all you are going to do is begin to churn the air instead of forcing it downward at the ground. It's just simple physics, the curve of the blade displaces air when in motion. Depending which direction the blade is cutting through the air determines which direction the air is going to be displaced. Spin the blade in the direction that the slant points downward away from and you'll displace the air downward, and upward in the reverse. So, get those blades spinning fast enough and you can displace enough air to cause the adequate amount of lift. I'm not sure of the math involved in lift, so I won't quote that.

Answer 3

In conventional aircraft, the wing profile (called airfoil) is designed to deflect air efficiently downward. This downward deflection causes an opposite lifting force on the wing (described by Newton's third law) and a lower pressure on the upper surface, higher pressure on the lower surface. This pressure difference integrated over the airfoil area causes a net lift. However, the more the lift of the airfoil, the more drag that is caused (induced drag by creating wingtip vortices). A helicopter makes use of the same principle, except that instead of moving the entire aircraft, only the wings themselves are moved in a circular motion. The helicopter's rotor can simply be regarded as rotating wings, from where the military name of "rotary wing aircraft" originates.

(more info at the site listed below)

Answer 4

A helicopter generates its lift from rotating wings (the rotor blade). As engine speed is increased, the main rotor revolves faster and therefore generates more lift. Conversely, as motor speed is reduced; lift is also reduced. However, a motor driven rotor system generates torque that acts on the helicopter fuselage. Twisting the fuselage in the opposite direction to the main motor. This torque is countered by thrust generated by a smaller rotor on the tail (tail rotor). The blades that comprise the tail rotor have a certain pitch angle that, when rotating at a given speed , generate thrust and balance exactly the main motor torque. By increasing or decreasing the speed of the tail rotor and hence varying the thrust generated, the helicopter yaw either left or right.

Answer 5

The blades are designed to deflect air downwards. so when they rotate, the air above the blades is sucked below it. this creates a low pressure above the blades and a relatively high pressure below it. the pessure difference above and below the helicopter is enough to lift it into the air. its nearly the same mechanism used in propeller run airplanes, the only difference is that the movement is vertical in the helicopter as opposed to the horizontal movement of the airplane.

Answer 6

Hey dude, instead of me telling the answer, let me help you find it yourself. Ever went boating? when you push row your boat, your oar pushes the water backwards. This action generates a thrust and pushes the boat forward as a reaction. Similarly when a bird flies, it pushes the air downwards and this thrusts the bird upwards. The same principle is used in many machines like hovercrafts, Jet Planes, Submarines, Ships and even in some cars(or atleast that is what I heard).
Now replace the oars of the boat or the wings of the bird with the propelling fan above the copter. I think you must be able to answer it now.

Answer 7

Newton's third law: for every action, there is an equal and opposite reaction.

A fan blows air, right? It does so by pushing the air in a certain direction with spinning fan blades.

A helicopter does the same thing; it pushes air downwards with what are essentially gigantic fan blades. It pushes so much air that it is able to lift itself upwards.

Answer 8

each rotor is a wing. The air on the top has further to travel, so there is a vaccuum on the top, which lifts. Also, by just turning the blades like a propeller, there is air forced down.

Answer 9

The rotor blades when spinning rapidly creates a lower pressure above the blades than below. thus lift is created--the effect of blowing air is also a factor when near the ground!

Answer 10

By forcing air downward