Why can't a Helicopter fly faster than it does

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  • TAG : Helicopter - Wikipedia, the free encyclopedia
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  • a. Parasite drag Parasite drag is the drag forces created by the components that protrude into the airflow around the helicopter. Because this drag is opposing thrust it is reducing the amount of thrust available to make the helicopter fly faster. Parasite drag includes the landing gear, antennas, cowlings, doors, etc. The shape of the fuselage will also produce parasite drag. On later helicopters where the manufacturer has attempted to raise the speed of the helicopter, the landing gear is retractable to reduce the amount of parasite drag produced. Generally, for a given structure, the amount of parasite drag is proportional to the speed that the structure is passing through the air and therefore parasite drag is a limiting factor to airspeed.

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    Ready for the rescue – with the mobile helicopter Fast Lane?
    This rescue helicopter with remote control, you can prove how skillful you are as a pilot. Fly the rescue of your life and save lives. To ensure that you are far away to hear and see the helicopter equipped with light and sound – and of course also the rotating propellers of the party!

  • However, in practice there are other factors which are likely to play a part in limiting the helicopter’s forward speed. As the helicopter flies faster and faster, there is a progressively increasing difference in the relative velocities of the advancing and retreating blades. To understand this, let’s put in some numbers. If the helicopter is moving forward at 30 knots, assuming no wind, the difference between the airspeed of the advancing blade and the retreating one is 60 knots. But if the helicopter is moving at 150 knots, this difference becomes 300 knots. There comes a point at which the root of the retreating blade, which is the slowest part, has zero airspeed, since the helicopter is moving forward at a faster speed than that section of blade is rotating. When that occurs, this particular section of rotor blade cannot produce any lift.

The Fastest Helicopter on Earth - IEEE Spectrum