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When a helicopter is a stationary the blades on both sides of the rotor give the same lift?
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∙ 11y ago
yes
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∙ 11y ago
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How does the helicopter stay stationary in the air?
Two things keep a helicopter flying, and another keeps it flying straight. To take off: 1) The blades are shaped like the wings of an airplane and create a difference in pressure (high underneath the wing, low above). This difference in pressure "pushes" the helicopter upwards (lift). But because of gravity, however, there might not be enough lift to take off from the ground. 2) In order to take off, the blades must rotate at supersonic speeds (to be stronger than gravity's push downwards), this make it possible to gain altitude. To "Fly:" 1) A helicopter's blades in air act like a boat's propeller in water. If the blades rotate at an angle, it will start moving. To make the helicopter hover, the blades must be perfectly straight up. At the same time, the rotating blades make the helicopter itself rotate the other way (about the axis of rotation). In a GPS, the helicopter would not be going anywhere like this (with no angle on the blades), but the Direction at which it is looking will be changing in circles 2) Helicopters need a way to fix this crazy-out-of-control spinning. They can use a tail rotor for this, but they can also use a "twin" set of blades that rotate in opposite directions (counter-rotating blades). With the addition of counter-spinning blades, now the GPS will be pointing at 1 direction. in summary: 1) By keeping the blades rotating fast enough to be lifting with the same force as gravity is pushing down, the altitude is kept the same. 2) By keeping the Blades from spinning at an angle, the Helicopter does not move to the sides. 3) By using a counter-rotating blades set, the helicopter is able to keep looking at one direction. with these 3 things, Helicopter are able to hover in air, and their GPS can be kept and a fixed height, at fixed position on a map, and at a fixed direction.
Why don't helicopters tip over from unequal lift from the two sides of the rotor?
The hub mechanism changes the angle of the blades constantly. So as they go around, they are in 'lift mode' only when moving forward .
What happens when both sides pull with equal force?
When both sides are pulling with equal force, the object is either moving at a constant speed or it is stationary (not moving) :)
Stationary objects are a result of what force?
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What are both sides of an equation equal to?
In Chemistry, this is the known as the Law of Conservation of Matter. While the moles of individual substances may change, the number of atoms of reactants is the same as the number of atoms of products.
How does the helicopter stay stationary in the air?
Two things keep a helicopter flying, and another keeps it flying straight. To take off: 1) The blades are shaped like the wings of an airplane and create a difference in pressure (high underneath the wing, low above). This difference in pressure "pushes" the helicopter upwards (lift). But because of gravity, however, there might not be enough lift to take off from the ground. 2) In order to take off, the blades must rotate at supersonic speeds (to be stronger than gravity's push downwards), this make it possible to gain altitude. To "Fly:" 1) A helicopter's blades in air act like a boat's propeller in water. If the blades rotate at an angle, it will start moving. To make the helicopter hover, the blades must be perfectly straight up. At the same time, the rotating blades make the helicopter itself rotate the other way (about the axis of rotation). In a GPS, the helicopter would not be going anywhere like this (with no angle on the blades), but the Direction at which it is looking will be changing in circles 2) Helicopters need a way to fix this crazy-out-of-control spinning. They can use a tail rotor for this, but they can also use a "twin" set of blades that rotate in opposite directions (counter-rotating blades). With the addition of counter-spinning blades, now the GPS will be pointing at 1 direction. in summary: 1) By keeping the blades rotating fast enough to be lifting with the same force as gravity is pushing down, the altitude is kept the same. 2) By keeping the Blades from spinning at an angle, the Helicopter does not move to the sides. 3) By using a counter-rotating blades set, the helicopter is able to keep looking at one direction. with these 3 things, Helicopter are able to hover in air, and their GPS can be kept and a fixed height, at fixed position on a map, and at a fixed direction.
Explain helicopter cyclic pitch controls?
In short, the cyclic control manipulates the AoA (Angle of Attack) of the rotor blades as they move through the air. A higher angle of attack generates more lift for a given relative airspeed, a lower AoA means less lift. Whereas the collective changes the AoA of all of the blades "collectively",changing the overall lift of the rotors -helicopter go up, helicopter go down - the cyclic control manipulates the AoA of the blades as they move in the "cycle", as the rotor blade moves around the hub. (Inventive with the naming of controls, aren't we?) By causing the blades to increase their AoA as they move towards one point in the rotor disc, and decrease their AoA as they move to the opposite side, lift on one side is greater. Push the cyclic forward, and the blades will have a higher AoA as they move towards the back of the disk and a lower AoA as the move towards the front. Thus, there is more lift in the back - rotor disc pitches forward, helicopter goes forward. In summary, whichever direction you push the cyclic, that side of the rotor disc decreases AoA and the opposite increases AoA. Nudge the stick lightly at 45-degrees, and the blades will have a slightly higher AoA at 315-degrees, a slightly lower AoA at 45-degress, and the helicopter will ease forward and to the right. Really laying into the stick increases the difference in AoA on opposite sides of the rotor - yanking back on the cyclic will cause a sharp increase in AoA as the blades move towards the front, and the nose will rear up, although most helicopters aren't fond of aggressive control inputs. Hope this helps. If you need a more detailed explanation or want to know the mechanics of how all of this is accomplished, it varies with the way different rotors are designed. The detailed mechanics are beyond me, maybe an engineer out there will chime in.
What are the physics of a helicopter I am looking for how the main rotors create lift for the helicopter to take flight?
They work exactly the same as the wing on a fixed-wing aircraft: the shape of the blades creates an air pressure differential between the top and bottom sides, which lifts the aircraft. This differential only exists when the blades are moving through air, so they simply attach the blades to a shaft and spin them rapidly.
Why don't helicopters tip over from unequal lift from the two sides of the rotor?
The hub mechanism changes the angle of the blades constantly. So as they go around, they are in 'lift mode' only when moving forward .
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What happens when both sides pull with equal force?
When both sides are pulling with equal force, the object is either moving at a constant speed or it is stationary (not moving) :)
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