# how do helicopters fly?

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I get that the spinny fan like pulls it up but like how does it spin because if I theoretically have a massive fan that spun at extreme speeds will my house fly?
Plus why do helicopters need spinny things when literally every other thing that flies just has wings and an engine. Also if the fan spins why does it spinning pull it up like when it’s on the ground it stays still but when it’s in the sky u can like manoeuvre it 360 like what.

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As the rotors (spinny fan) spin they create an area of low pressure above them, and (consequentially) an area of higher pressure under them.

Air likes to go from high pressure to low pressure. So it does.

And that takes the rotors with it (and whatever’s attached to the wings). So the whole machine lifts up.

> but like how does it spin

Helicopters have powerful engines which spin the main rotor as well as the tail rotor. This is one of the main hurdles to getting helicopters to work at all, and what makes them consume more fuel than a traditional airplane.

> if I theoretically have a massive fan that spun at extreme speeds will my house fly?

Yes, that could work in concept. Basically you are just describing a massive helicopter.

> why do helicopters need spinny things when literally every other thing that flies just has wings and an engine.

For a traditional airplane the engine pushes the aircraft through the air and the movement over the airfoil of the wings creates lift to make it fly. With a helicopter the airfoil is the blades of the main rotor and they are moved through the air by its rotation, creating lift that way. One of the main aims of helicopters is to be able to keep the craft relatively stationary so instead of moving the entire vehicle they just move the airfoil.

> if the fan spins why does it spinning pull it up like when it’s on the ground it stays still but when it’s in the sky u can like manoeuvre it 360 like what.

The blades on the main rotor change their orientation or “angle of attack”, allowing the amount of lift they generate to be altered. This can happen with all the blades at once by something called the “collective”, allowing the pilot to adjust overall lift. It also happens mid-rotation by a mechanism called a “swashplate” controlled by the joystick of the pilot, allowing a blade of the rotor to for example produce more lift when it is in the rear and less when at the front. By changing the angle of attack of the airfoils at different points in their rotation the pilot can steer the helicopter around.

>how does it spin

It’s attached to a powerful engine

>if I theoretically have a massive fan that spun at extreme speeds will my house fly?

Yes

>Plus why do helicopters need spinny things when literally every other thing that flies just has wings and an engine

Because Helicopters and Planes are good for different things. Planes can’t hover in place, and need massive runways

>Also if the fan spins why does it spinning pull it up

A rotor is like a wing. The rotor moves through the air fast because it’s spinning, and that creates lift pulling upwards

>like when it’s on the ground it stays still but when it’s in the sky u can like manoeuvre it 360 like what.

Can you elaborate on what you mean by this ?

Helicopters use rotors to fly .The rotors create lift by making a low-pressure area above them and a high-pressure area below them, and this difference in pressure keeps the helicopter in the air. By changing the angle of the rotor blades, the helicopter can change how much lift it generates, allowing it to move up and down or stay in one place.

But, unfortunately, just having a massive fan spinning really fast won’t be enough to lift something as heavy as a house. To generate lift, you need something like a helicopter rotor or an airplane wing that’s specifically designed to create a difference in air pressure and lift objects off the ground. The rotor blades on a helicopter are specially shaped to create lift as they spin, and they can be adjusted to change how much lift they generate.

Helicopters use rotors instead of wings because they need to be able to take off and land vertically, and hover in one place. Wings are great for staying in the air, but they need forward motion to work properly.

Like when it’s on the ground you can spin the fan and it won’t go anywhere but then when ur in the air u have a stick that can move to go anywhere