I need how helicopters engines work?

Question

I need it because I wanna know how helicopters take off and fly. I think this question is enough for today.

Answer 1

http://travel.howstuffworks.com/helicopter.htm

Answer 2

Helicopters fly because the advancing blade of the rotor has the same efect as the airofoil shape of a fixed wing aircraft as it is thrust forward. That is, the air flow on the top of the blade is faster than that underneath the blade causing a partial vacuum above the blade sucking it upward.

The problem with a helicopter is as the blade sweeps around it produces negative lift when it is moving backwards until it comes back around sweeping forward.

This gives rise for the need for multiple blade rotors and very powerful hi-torque engines such as the Wankel engine.

A tail rotor counters torque reaction of the main rotor and this can be controlled to make right and left turns. The pitch of the main rotor can be adjusted to give a combination of lift and forward thrust and also the control of the lift can be used in rising and falling of the craft.

Overall, Helicopters are very unstable and much harder to fly than conventional aircraft.

Answer 3

Helicopters: How They Work
Jet Engines
Jet (Gas-Turbine) engines are usually thought of as thrust producing engines and not engines that drive rotors or propellers. Jet engines are used for both thrust production and for drive power. If you have ever heard of "turboshaft" or "turboprop" engines, they are basically jet engines that do not produce thrust. They take the power from the production of thrust and turn it into mechanical power to drive rotors or propellers. The way the turbine blades are shaped determines whether they change thrust into great amounts of power to drive a shaft, or if they allow most of the thrust to be used as propulsion and take little drive power away to just drive the compressor section of the engine.
Helicopters (In almost all cases where jets are used) use turboshaft jet engines to power their rotors. The UH-1 Huey, the Bell Jet Ranger, and the AH-64 Apache all derive their power from gas-turbine engines. Some older or smaller helicopters use "reciprocating" (Piston) engines for their power source, but most of the helicopters in use today use gas-turbine engines. They are light, very powerful and economical. The best part is that they are very reliable as well. Failure rates for gas-turbine engines are very low because there are not as many internal moving parts as there are in a reciprocating engine.
Lets look at how a jet engine works. A jet engine works on four very simple principles: "Suck, Squeeze, Burn and Blow". (Stop laughing now...this is serious stuff)
How does the power get from the engine to the rotors?
The power is transferred from the engine using a main gearbox which changes the power from the engine and sends it to the transmission. In the transmission RPM is reduced from thousands of RPM to hundreds of RPM. By doing this the torque is increased and the rotation is slowed to an acceptable level for the rotor system. The transmission drives the mast which gives direct rotation to the rotors. Often another shaft will come out of the transmission to directly drive the tailrotor as well.
An accessory gearbox mounted on the engine draws little engine power to drive things like the oil pump, the generator and the fuel control for the engine itself.

Answer 4

Visit your local library.