Faster than a $20 Hooker and At Least Twice as Fun

The X2 is an experimental helicopter being developed by Sikorsky, an American company, at a test-flight centre in Florida. It recently flew at more than 430kph (267mph), according to a report in Spectrum, published by the Institute of Electrical and Electronics Engineers. _Economist

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Sikorsky's X2 experimental prototype is being developed in order to bring speed to the commercial helicopter industry. The X2 has already flown faster than the official speed record for helicopters, but not officially.

To make an official attempt on the record, Sikorsky will need to have the flight monitored by the Fédération Aéronautique Internationale, which compiles airspeed records. But that is unlikely to happen until the X2 is going even faster. Later this year, Sikorsky hopes it will be zipping along at more than 460kph. The company, however, is interested in more than just breaking speed records. It plans to use the technology developed for the X2 in commercial helicopters.

...it uses two counter-rotating rotors that spin around the same axis, one positioned above the other. So in forward flight each rotor can produce an equal amount of lift on each side, thus providing balance. The idea has been around for some time, but it proved difficult to make it work properly.

What has changed are technological advances in aircraft engineering and control systems. Now, vibrations can be reduced using “active control”, which involves placing sensors around the helicopter to detect the onset of vibration and then using force generators on various parts of the frame to vibrate in such a way that they cancel out the original tremors. Advanced computer modelling has also made it possible to design more efficient rotors. A pusher propeller has been fitted at the rear of the X2 to provide extra oomph. According to the engineers, this propeller can also be used to slow the helicopter snappily. And computerised “fly-by-wire” controls allow the X2 to be flown relatively easily.

Sikorsky reckons that future helicopters built using the X2 technology would be extremely versatile machines. They would dash to and from a medical emergency a lot faster. They would also be very agile in flight, which would increase their capabilities in combat. Sikorsky has already produced a simulator so that potential customers can experience what these fast helicopters will be like to fly. Plenty of whirlybird pilots will be keen to get their hands on the real thing. _Economist

It may be some time before ducted fan technology is able to match the new capabilities of the X2. But I have a feeling that VTOL flying is going to become a lot more exciting.

H/T Bruce Hall