How do helicopters fly?

Question

How do helicopters fly?

Answer 1

the propellers move and it lifts into the air, and VOILA!

Answer 2

the top rotor gives lift and motions and the rear keeps it stable

Answer 3

Helicopters use the same concept as fixed wing aircraft to fly.

Think of a helicopter rotor as the two main wings of an airplane. As the rotor spins around, air is flowing over the rotors like the wings of an airplane.

So, in the case of fixed-wing aircraft, the engine pulls the entire airplane through the air, which creates airflow around the wings, creating lift.

In the case of rotary aircraft, the engine only pulls the rotor or "wings" of the helicopter through the air and creates lift as well.

Now, because the helicopter's rotor is very large, and there are insufficient aerodynamic airflow around the helicopter (remenber, helicopters hovering arn't getting any airspeed), a large amount of torque is generatored.

Newton's third law says for every action, there is a reaction.

The rotor wants to spin clockwise, as a result, the rest of the helictoper will try to spin counter-clockwise.

This is the main reason why there's a second rotor at the back of the helicopter to counter this torque. However, it's too small to generator enough torque to flip the helicopter.

Answer 4

the propellor spins and pushes the earth  out of orbit. this may be damaging to the laws of the universe but its necessary in order for humans to evolve. Just like Twinkies.

Answer 5

They beat the air into submission.  Just kidding.  The rotor on top is like a moving wing, and provides lift and directional control.  The tail rotor opposes the torque, and provides yaw control.  They fly very differently from fixed wing aircraft, but are great for rescue and short trips with small landing fields.

Answer 6

Another name for a helicopter is a rotary wing aircraft. The lift is provided by the rotor (a curved airfoil) which can be tilted forward to give forward motion, back to move the Craft backwards etc. The tail rotor provides a force which counters the torque of the spinning rotor and allows the pilot to keep the craft under control. There are some helicopter's that have a ducted exhaust rather than a tail rotor. It provides the same function.

Answer 7

look it up dude. it's not easy to explain.