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Helicopters

A helicopter is an aircraft which is propelled and lifted in the air by one or more large horizontal rotors. Focke-Wulf Fw 61 was the first operational helicopter manufactured by Focke-Achgelis in 1936.

1,671 Questions

The rotor blade on the side of the helicopter that moving in the opposite direction?

The tail rotor is moving "perpendicular" to the main rotor, not "opposite".

The tail rotor creates thrust opposite to the thrust of the main rotor, to keep the fuselage from spinning.

Most helicopters spin the main rotor counter-clockwise looking from above, which puts a clockwise rotation on the fuselage. You need a tail rotor pushing the tail counter-clockwise to keep the fuselage pointed in the direction the pilot chooses.

Why helicopters have Wind limitations?

All aircraft, not just helicopters, have wind limitations. Essentially they are placed so that structural limits will not be exceeded. If too much wind force is exerted on part of an aircraft that is not strong enough to withstand that force then a catastrophic failure could occur.

How does a helicopter hover in the same spot?

The lift/propulsion method used by a helicopter is capable of producing an overall thrust vector with virtually no horizontal motion. The lift method of planes (fixed wing), requires movement to produce lift.

There are many possible helicopter configurations - most designs use some variation of multiple rotors placed in such a manner that rotational force is compensated for, allowing stable flight. Lift is able to be generated because the rotors (which are essentially just spinning wings) are still moving through the air, while the airframe overall stays in the same place.

How much gas can an 2008 G35S hold?

According to Infinity specifications the fuel capacity is 20.0 Gallons

How does a helicopter pilot increase the lift?

A helicopter pilot can increase lift by increasing the pitch angle of the main rotor blades or by increasing the collective pitch angle, which changes the angle of attack for all blades simultaneously. This increases the helicopter's vertical thrust and lift.

How does a helicopter create lift?

A helicopter creates lift through its main rotor blades, which generate lift by spinning rapidly and creating a pressure difference between the top and bottom of the blades. This pressure difference causes air to flow over the rotor blades, creating lift that allows the helicopter to become airborne.

A helicopter is lifting an 800-pound unit at a rate of 200 feet per minute how many horsepower of work energy is the helicopter using in the process?

To calculate the horsepower used by the helicopter, you first need to convert the lifting work into units of power (horsepower). The formula to calculate power is: (Force * Distance) / Time. In this case, you would calculate (800 lbs * 200 ft) / 1 min to get the power in foot-pounds per minute. To convert that to horsepower, you would divide by 33,000 (the number of foot-pounds per minute in 1 horsepower).

For a helicopter to be stable as it flies it must have at least two propellers. why?

Helicopters require at least two propellers to achieve stability through a concept known as "counter-torque". The main rotor produces torque that would rotate the body of the helicopter in the opposite direction. The tail rotor or fenestron is used to counteract this torque, providing stability by keeping the helicopter from spinning uncontrollably.

How does a helicopter achieve lift?

A helicopter achieves lift through its main rotor blades, which spin rapidly to create lift by generating airflow over the rotor blades. The shape of the rotor blades and the angle of attack can be adjusted to control the lift produced. This lift overcomes gravity, allowing the helicopter to become airborne.

How do helicopters hover?

A helicopter moves forwards by the rotors spinning, and being slightly tilted. So if the rotors are flat, it will hover. This is because the air being pushed by the rotors is going straight down, not onto another surface, thereby making it go forwards.

What is the force that pulls an airplane back?

the answer to this question is pull it is the opposite to push.push is the force that makes it go forward and pull is the force to bring you back...go liverpuddlians:):):):):):):):):):):):):):):):):):):):):):):):):):):):):):)

Can a helicopter work in space?

No, only specially designed rockets can go up into space. As soon as a helicopter reaches our atmosphere boundaries, it would burn up. Rockets on the other hand, have been specially made to hold such extreme temperatures. :)

Why does the rotors spin on an helicopter?

The rotor blades on a helicopter work the same way as wings on a fixed wing aircraft. The air passing faster over the top of the airfoil generates lift. Helicopter rotors spin so that the lift is generated without having to have forward airspeed like a fixed wing aircraft.

Why can't rescue helicopters fly in low air pressure?

I've never heard that. However, helicopters are limited to the altitude that they can hover, which would limit a Rescue helicopter from picking up a stranded mountain climber. In the high altitude, the air is "thinner" which means the air pressure is less. This limits the effiency of the rotor blades. However, usually the first indication of a problem is when a helicopter tries to hover at high altitude and the tail rotor looses it thurst and the helicopter goes into an uncontrolled spin. This was common with the Bell Model 206B. Even though a helicopter may be limited to the altitude at which it can hover, that does not mean it can't fly at that altitude. If a helicopter maintains a high forward air speed, it can still fly over mountains; its only when it stops and hovers that it may have problems.

What is the working principle of helicopter?

Helicopters generate lift and thrust through the rotation of its main rotor blades. By changing the pitch of the blades, the helicopter can control its altitude, direction, and speed. Additionally, the tail rotor is used to counteract the torque created by the main rotor to keep the helicopter stable.

How do plains fly?

Planes fly by generating lift from the wings as they move through the air. This lift is created by the shape of the wings and the speed at which the plane is moving. Engines provide the necessary thrust to propel the plane forward.

Why can't helicopters fly upside down?

Actually, a helicopter can fly upside down but not for long.If you go to... http://www.guardian.co.UK/notesandqueries/query/0,,-186989,00.htmlYou can get answer to why I say they can fly upside down. They can only fly upside down for a certain amount of time though.My reference is ^. I am NOT playgerizing.The reason is due to the design of the rotor blades and the grips that hold them and the mast. It is how the parts were designed to carry loads. Most Mast and Blade designs are build to carry a load UNDER it but it is not rigid enough to invert it so the load is above it.Most vintage Bell Helicotpers had teetering rotors and was limited to about 60 degree banks because the rotor blade would bang against the mast. In the 1980's they had some accidents involving "mast bumping" and they had to redesign the rotor system to include bumper pads or stiff springs to absorb the shock of the blade hitting the mast.However, most times that helicopters are flown upside-down they are flying such that the G-forces is still loading the rotor blades in the same direction. They can do a Loop or a Split-S and the momemtum of the helicopter keeps the rotor blades loaded in a positive force. They very seldom fly inverted in level flight so the load on the rotor is Negative.

What is the center of gravity on an aircraft?

The place where the airplane balances. It can vary, because fuel, passengers, cargo and so forth can be put in various places.

If the center of gravity is too far from the ideal location (out of limits) the aircraft will not handle properly, and may not fly at all. Worse, it may get into the air and then become uncontrollable. Failure to properly calculate and adjust CG has killed many pilots and their passengers. The aircraft has to "Balance" all the forces of Lift and Weight. The tail control surfaces (on typical aircraft) are used to balance the aircraft a small amount. The Center of Lift is usually located about 1/4 the width of the wing airfoil, measured from the nose of the wing. The Center of Gravity for the weight of the entire airplane and its contents should be close to this same location.

How might an aeroplane fly like a helicopter?

It flies Like an Airplane and Hovers Like a Helicopter

... or if the engine has enough power to it, and the pilot brings it up to a 90 degree climb, lets it slow down, then adjusts the throttle to hover the plane...

How does leaded petrol harm the environment?

The lead is emitted by the car exhaust as a gas which can be absorbed in the bodies of people who breathe the gas. It accumulates in the body as the body has no mechanism to deal with it and affects the brain, reducing IQ.

How does a helicopter get off the ground?

Answer That is easy and it is difficult to explain. Each of the helicopter blades act as a wing and produce Lift. The blades have control inputs that rotate it so its angle increases and this increases lift. When the pilot pulls UP on the Collective Controls, this increases the pitch of all the blades at once so all begin to lift together. The helicopter will rise vertically. In order for the helicopter to fly forward, the Cyclic Controls increases the pitch on each blade as it reaches a specific point in its rotation around the Mast. This pulls the aircraft forward. Think of it as rowing a boat by swinging your paddle around your body but only dipping it into the water at one point.

What happens to the advancing blade of a helicopter?

The "advancing blade" of a helicopter refers to the side of the rotor which moves forward in relation to the fuselage. As each rotor blade makes a full circle around the center, on one side of the swing, it moves forward, and on the opposite side it is moving towards the rear of the helicopter.

When the helicopter is moving forward in air, the rotor blades on the advancing side are moving at a higher airspeed than the rotor blades elsewhere. Rotor speed + aircrafts forward airspeed. This results in slightly more lift on that side. Conversely the exact opposite is happening on the other side where you get Rotor speed - aircraft forward airspeed. This creates a tendency for helicopters to want to roll at high airspeed.

This is one of the many odd tendencies of rotor aircraft that pilots are constantly adjusting to balance out.

How does a helicopter stay in the air?

The source of lift force from the rotor (Rotation of two objects 'blade' creates a lifting force) blades allows the helicopter to stay in one area for extended periods of time. Each rotor blade, whether it is 2 or 7, has the ability to change pitch. This means the blade can rotate so that the nose or leading edge can tilt down or up. If it pitches up, the lift of the blade increases. Collective Controls As the blades rotate it produces lift. The pilot inputs controls that increases the pitch on all the blades at once. All the blades pitch up and produce more lift, so the helicopter rises. Cyclic Controls The pitch of the blades can also be controlled so that the blade pitches UP when it is on one side of the helicopter and pitches DOWN when it is on the other side. As the advancing blade is moving from rear to front, it decreases it Lift. Then as the blade moves to other side, it increases its Lift and pushes the helo through the air. In a simply explanation, this is what causes the helicopter to fly forward. Think of it like someone paddling a canoe. On many helicopters, the input is accomplished through the controls of the Swashplate. Custermen - Worked 11 years at Bell Helicopter.

How does a helicopter fly?

A helicopter is able to fly because of the lifting effect of its main rotor.

The rotor blades of a helicopter act in the same manner as the wings of a plane, creating lift by forcing air above and below a curved airfoil. The air moves faster over the top of the blade, reducing the pressure there. The air below pushes upward with greater pressure, lifting the rotor and the attached frame and cabin. At the same time, the blades can be angled in any direction, allowing it to move in any direction by using the blades like the propellers on an airplane. Jet helicopters also generate some forward speed from their turbine exhaust.

The main rotor is the set of blades on the top of the craft, driven by the engine (piston, jet turbine, etc.). By turning the blades, which are airfoils and like a narrow "wing" in shape, we move them through the air. And by "tipping" the leading edge of the blade up (increasing the pitch) as it moves, the blade will have a positive angle of attack. It will bite into the air and force that air down. This forces the blades up, and the rotor will provide lift. Lift causes the craft to defy gravity.

The torque (rotational motion) of a single rotor blade will have to be offset, and the tail rotor does this. Additionally, the tail rotor (or air turbine in the NOTAR helicopter) will also allow the craft to be turned and "pointed" in another direction. The pedals control the tail rotor or air turbine. By pushing the stick to the side (and adding a bit more pitch with the cyclic), the blades can be controlled to allow a bit more lift on one side to tip or bank the chopper and turn it. (A bit more pitch is added to offset the slight loss of lift.) The pedals will also be used in conjunction with the stick. By pushing the stick left, the blades will have a bit more pitch as they come around on the right side and a bit less as they come around on the left side. This will bank and turn the helicopter.

Pushing the stick forward causes more pitch to the blades as they come around the back of the circle they make around the craft. This lifts the back of the craft. And it will make for a bit less pitch in the front for a bit less lift in front. This tips the craft forward. Often when we see a helicopter take off, it rises a bit, tips forward (now that the rotors will clear the ground), and accelerates forward as it continues to rise. The pilot has pulled up on the collective (to increase the pitch of the main rotor blades). That provided lift. He also has to push forward on the cyclic to tip the helicopter forward to begin to gather forward airspeed.

(for more information see the related links below)

A helicopter can take off and land vertically (straight up and down). It can fly in any direction, even sideways and backwards. It can also hover or hang in the air above a given place.

A helicopter gets its power from rotors or blades. When its rotors are spinning, a helicopter doesn't look much like an airplane. But the rotor blades have an airfoil shape like the wings of an airplane. So as the rotors turn, air flows more quickly over the tops of the blades than it does below. This creates enough lift for flight.

Additionally, helicopters avoid areas close to storms. The reason is that the helicopter requires a careful balance of the air supporting it. Downdrafts or turbulent winds can drastically affect control of the helicopter.