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Helicopters use the same principle as aeroplanes to produce lift, the main difference is how they employ it.
As with planes a helicopter uses a aerofoil to produce lift by passing air over the top of a foil faster than under it due to the geometry of the foil. The pressure difference between the air flowing fast over the top of the foil(low pressure) and slow under the foil(high pressure) results in an upwards force on the rotors of the helicopter, the pilot can essentially control the amount of force(or lift) acting up by changing the speed of the respecting flows of air. This is done by changing the angle with which the aerofoil cuts through the air.
The spinning of the rotors produces a torque, which if left unbalanced would result in the helicopter spinning like a top and not producing enough lift. This torque is countered by a tail rotor usually or a contra rotating propeller (e.g. the chinhook)
What else can I help you with?
A flight can stay air with out moving?
No... a flight cant stay in air without moving..even for a second....but some of the fighters and helicopters can stay in air for minutes or hours..
How are helicopters refueled in air?
Some large helicopters use 'drogue and hose' refuelling
Why are helicopters called helicopters?
Helicopters can hover stationary in the air, but they are not called hovercraft. A hovercraft is a ground based vehicle that rides on a cushion of air that is constantly pumped under a skirt around the base of the vehicle.
Can birds hover in place like helicopters?
No, birds cannot hover in place like helicopters. Helicopters use rotors to generate lift and stay in one spot, while birds rely on flapping their wings to stay airborne and move forward.
Does the Air Force use helicopters?
Of course they do!
Can you fly the aircrane in gta 4?
no, if u wanna get in the air, u have to use helicopters
Are Helicopters important?
Yes, and not only as military equipment.- if it wasnt for helicopters, hundreds of thousands of people would not be alive today with things such as - Search and rescue helicopters Firefighting helicopters Air ambulances (medEvac) Coast guard helicopters the reality is that helicopters are vital in our modern world
What is the relationship between altitude and air pressure to explain why rescue helicopters have a difficult time flying at altitude over 6000m.?
The higher you are from the Earth's surface - the lower the air pressure is. Helicopters are heavy machines - requiring a huge amount of effort from the rotor blades to keep it airborn. The lower the air-pressure, the harder the rotors have to work to keep the craft flying.
What are helicopters used as?
Air platforms. Ability to hover. Think about it.
Portion of the air field where aircraft and helicopters park?
Aprons
Why can't helicopters fly into the stratosphere?
The air gets thinner as altitude increases, which in turn decreases the amount of lift an aircraft can get. The air in the stratosphere is far too thing for helicopters and most planes.
Why are helicopters called hovercrafts?
Helicopters can hover stationary in the air, but they are not called hovercraft. A hovercraft is a ground based vehicle that rides on a cushion of air that is constantly pumped under a skirt around the base of the vehicle.
