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| Picture I |
Kimmo Huosionmaa
The problem with the helicopters is that they are not very fast, in the comparison between aircraft, and the second thing is that sometimes helicopters are so noisy. When the SWAT-team would land on the roof of the building, they normally want the operate silent, or that's what normal people think because that allows them to make surprise attack to space, where the target is.
If the helicopter would be hit by weapons, it should land safely, and that's why there should be used the autorotation if there would be problems with engines. Autorotation is the thing, what is used in the "Autogyros", and it means that the rotor of the helicopter would let rotate freely, what would be slow the dropping speed. The same system, what makes helicopters safe in the landing situation, makes it silent. The idea of the Autogyro is not new. In the medieval time were created the toys, what were landed slow, when they were thrown in the air.
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| NACA (National Advisory Committee for Aeronautics) Autogyro from the year 1931 Picture II |
Those rotor-toys gave an idea to Juan de Gierva to make the worlds first Autogyro. In the movie "007 and the Moonraker" James Bond used Autogyro against bad guys helicopters, and in some rumors, the CIA and MI-6 have those small Autogyros, what are equipped with "Stinger" missiles and lightweight anti-tank weapons like Bofors RBS-56 "Bill". Also, light machine guns can be used in this thing, what could be effective against some drug baron. Those lightweight aerial vehicles can be also used in mercenary-operations around the world.
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| Picture III |
If the rotor of the helicopter would be equipped with the connector, what is used in cars, the pilot can turn the power off from the main rotor, and then the helicopter would land without noise. But when we are thinking about Autogyros, we can build them to look like the normal helicopter. When the Autogyro is going airborne, the power would be connected to the main rotor, and the system acts like the normal helicopter. And when the pilot wants to fly fast, the power would switch off the main rotor, when the helicopter would increase the speed.
But when we would want to make the helicopter, what can fly as fast as the airplane, we would face the problem, that the main rotor would not stand the speed. This is why there have been created the system, what is known as the "disc rotor". That system is actually the disc what increases like the pancake when the speed of rotor would increase, and when the speed of rotor would decrease, the size of the disc would decrease. This would give a chance to make faster helicopters or Autogyros than ever before.
Sources
https://en.wikipedia.org/wiki/Autogyro
https://en.wikipedia.org/wiki/Pitcairn_PCA-2
Film of disc rotor in action
https://www.youtube.com/watch?v=d8AEfFZXG1c
Picture I
https://taskandpurpose.com/wp-content/uploads/2017/04/Screen-Shot-2017-04-20-at-6.15.24-PM-840x420.png
Picture II
https://upload.wikimedia.org/wikipedia/commons/9/9b/The_Pitcairn_Autogiro_%289467667452%29.jpg
Picture III
https://i.ytimg.com/vi/d8AEfFZXG1c/hqdefault.jpg
https://crisisofdemocracticstates.blogspot.com/
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