Sikorsky Aircraft’s goal of producing the fastest helicopter ever built has taken another step towards becoming a reality. Its coaxial X2 Technology demonstrator has achieved a speed of 181 knots (208 mph) in a test flight – faster than the 160-170 knot speeds generally possible with conventional helicopters and edging closer to the eventual aim of delivering 250 knot (288 mph) cruising speeds.
As we’ve reported previously, the X2 demonstrator combines an integrated suite of technologies intended to advance the state-of-the-art, counter-rotating coaxial rotor helicopter. These include fly-by-wire flight controls, counter-rotating rigid rotor blades, hub drag reduction, active vibration control and an integrated auxiliary propulsion system.
After the latest test flight Jim Kaglis, Program Manager, Sikorsky Advanced Programs for Sikorsky, said, “the X2 Technology demonstrator today exceeded average helicopter speeds of a conventional helicopter, generally 160-170 knots.”
“The demonstrator is proving out the technologies very well, from the active vibration control system to the fly-by-wire controls. There are no show stoppers here so far, and now the program turns a corner, as this completes phase three of four. We are flying forward to the 250-knot cruise speed," Kaglis added.
Naturally speed isn’t the only feature Sikorsky is aiming for with its new helicopter technology. Attributes such as excellent low-speed handling, efficient hovering, and a seamless and simple transition to high speed are also desirable, and are all things that were successfully demonstrated on previous test flights.
In case you were wondering, the record of the world's fastest helicopter has been held for over 20 years by the British built Westland Lynx ZB-500, which reached 249.1 miles per hour (400.8 km/h) at a European air show in 1986.
As usual, the important things are left out of your articles. I have petitioned the city council of Los Angeles and the police department about their helicopters.
Usually they only come out and fly around looking for the nearest donut shop.
After waking everyone up in the neighborhood they insist on hovering over, or flying round and round with this deafening sound, they finally leave, with nothing happening.
Now if your article said that these helicopters were SILENT, wafting through the air with the greatest of ease, well then I would be greatly impressed.
Perhaps you could do a follow up story about this important ingredient in developing helicopters,
It is my best guess with the double windmills on top of this sleek new model will be making TWICE the noise of the regular helicopter.
I wish Sikorsky would develop a silent helicopter for the police and the military.
Don\'t you think that would be a great idea????
There is much too much noise in this world.
Interesting project. I wonder if they\'ll fit it with winglets to off-load the main rotors at high speed. They may as well, \'cos they are going to need somewhere to hang the mini-guns, missiles, bombs and rockets that they undoubtedly have in mind for it... :)
What Jerry is talking about to is efficiency. The power consumed by the tail rotor does not add to the speed or lift. It is wasted countering the torque produced by the main rotor.
While you may damage the pusher prop, it will no longer be a major emergency due to loss of yaw control.
Controlling the yaw on a co-axial is done by differentiating the lift produced by each rotor; the collective of one goes up while the other goes down and the combined lift stays the same.
Winglets would compromise hovering performance. One of the aims of the project is to gain higher cruising speeds while maintaining hovering performance.
When I hear a heli fly overhead at night, a flush of calm comes over me and I feel at peace in the world. Luckily for you, though, those many short blades should make it quieter.
Not true. The main limiting factor is retreating blade stall. That doesn\'t matter so much when you have another rotor running the opposite direction since you now have lift from both sides.
@windykites1
Autogyros are slow. The main rotors create huge drag -- they convert forward airspeed into lift.