Why the helicopters need pressure in the air to run??

Question

why the helicopters need pressure in the air to run??.. wht is the technical reason behind that?? give me some related links.

Answer 1

It's a bit of a strange question; if there was no pressure in the air there would be a vacuum, making life in general very complicated-so also for helicopter pilots. Furthermore any AIRcraft needs air to work, because it's the basic principle it works on.

Do some internet searches on Bernoulli's principle, perhaps that clarifies it a bit.

Good luck

Answer 2

It is air propulsion...

Helicopter is an air-plane... and gilds with the help of air...

Answer 3

the pressure of air is one of the variables that imflict the lift, and drag. /indirectly through influencing the relative weight of a volume of air/

higher pressure /while other variables  -i.e. temperature - remain constant/ means higher relative weight which in result means higher lift and drag

basically the more pressure, the more air bypasses the wing, or rotor blade or engine blades.

in the same time the higher pressure means larger mass of air enters the jet engine /or cylinder of the combuistive engine/ in the same volume -making better jet outputs /jet engine output is related to the mass*speed of exhaust gasses/ and providing the combustive reaction with more oxygen to burn the fuel /that's why supercharged cars and suprecharged aircraft engines are in use/

Answer 4

air is thinner higher you go so it takes less work

Answer 5

The blades on a helicopter are small airplane wings, basically.  As they spin the shape creates a pocket of low air pressure above them and higher air pressure under them, which allows the helicopter to lift.  Check out the sites below for more detailed explanations.