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Thread: Sikorsky X2

  1. #1
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    Sikorsky X2

    Jun. 01, 2005
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    Sikorsky Aircraft today announced plans to build and test a demonstrator for a new class of coaxial X2 Technology helicopters that maintain or improve on all the vertical flight capabilities of rotorcraft and whose high speed configuration will cruise at 250 knots


    Sikorsky plans to build and fly its X2 Technology demonstrator helicopter at its Schweizer Aircraft subsidiary by the end of 2006. Preliminary design work for the demonstrator is finished and parts fabrication for the aircraft has commenced.

    X2 Technology refers to a suite of technologies Sikorsky will apply to achieve new levels of speed and performance in coaxial helicopters. Coaxial helicopters feature two counter-rotating rotors on the same vertical axis.

    The announcement came at the American Helicopter Society International's annual technical forum in Grapevine, Texas, where Sikorsky unveiled new scale models of X2 Technology helicopter concepts in various weight classes and configurations.

    "We initiated X2 Technology convinced that the most productive and flexible helicopter is a helicopter which is capable of a significant increase in speed," said Sikorsky President Stephen Finger. "Customers are demanding greater speed but without sacrificing any of the unique capabilities that make helicopters the ideal platform for countless civil and military missions."

    X2 Technology aircraft will hover, land vertically, maneuver at low speeds, and transition seamlessly from hover to forward flight like a helicopter. In a high speed configuration, one or more 'pusher props' are part of an integrated auxiliary propulsion system to enable high speed with no need to physically reconfigure the aircraft in flight.

    The top cruise speed of helicopters in service today, roughly 150 to 170 knots, are only incrementally better than what they were decades ago due to the fundamental limits of conventional rotor systems.

    Previous attempts to develop faster helicopters have resulted in degraded hover performance. Likewise, attempts at fixed wing or hybrid vertical lift aircraft have resulted in aircraft with less hover capability than helicopters.

    Sikorsky selected the term X2 Technology in order to: describe a class of helicopters with a coaxial design and to describe the multiplying effects (2X, or times 2) of applying a suite of modern technologies to coaxial helicopters. These technologies include new rotor blade designs, advanced flight control laws, transmissions with greater horsepower to weight performance and the ability to seamlessly transfer power from the main rotor to the aft propulser, and active vibration control.

    Sikorsky will also incorporate decades of company research and development into X2 Technology helicopters, including: the XH-59A Advancing Blade Concept Demonstrator which showed high speed was possible with a coaxial helicopter and auxiliary propulsion, the Cypher UAV which expanded company knowledge of the unique aspects of flight control laws in a fly by wire aircraft that employed coaxial rotors and the RAH-66 COMANCHE, which developed expertise in composite rotors and advanced transmission design.

    The X2 demonstrator will feature a coaxial design (two rotors on the same axis) and a 'pusher prop' to supply auxiliary propulsion that will enable the aircraft to reach high speeds of 250 knots per hour.
    Banking establishments are more dangerous than standing armies

  2. #2
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    It looks like a Kamov Ka-50-2 with a pusher prop......





    Ken
    Flanker Freak & Russian Aviation Enthusiast.
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  3. #3
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    It looks even more like the Sikorsky S-69 Advancing Blade Concept (ABC). http://avia.russian.ee/vertigo/sik_s-69-r.html
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  4. #4
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    the application of such speeds in milirary and commercial helos would be tremendous
    Banking establishments are more dangerous than standing armies

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    So we are back to the ABC rotor? I thought that died (along with the X-Wing) when the Osprey and its tilt-rotor was selected. But sure is good news! Hope they also revive the circulation control rotor concept!

    An annotation about the Kamovs above: That coaxial counter-rotating rotor is different from the concept described in the articel on top.
    Last edited by Distiller; 2nd June 2005 at 12:30.
    "Distiller ... arrogant, ruthless, and by all reports (including his own) utterly charming"

  6. #6
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    Does anyone know what became of the Westland proposal to do a Lynx based compound helicopter demonstrator?

  7. #7
    junipergoth Guest
    remember the lovely cheyenne from the late 60s/ear;y 70s? now that was a real great bird, looks a killer and stunningly capable. more like a jet fighter than a chopper. i believe it couldnt hover though? well looks like the new bird a bit by sikorsky, prop at the back and similar shape. i think speed of the cheyenne was over 200 knots so quite close to the new bird. just lost out in hovering regime...

  8. #8
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    Quote Originally Posted by Distiller
    So we are back to the ABC rotor? I thought that died (along with the X-Wing) when the Osprey and its tilt-rotor was selected. But sure is good news! Hope they also revive the circulation control rotor concept!

    An annotation about the Kamovs above: That coaxial counter-rotating rotor is different from the concept described in the articel on top.
    How so ??

    Apart from rigid rotors(?), different blade material, fbw controls - the concept is the same isn't it ?? co-axial, counter rotating rotor blades.

    Or, am I missing something ??

    Ken
    Flanker Freak & Russian Aviation Enthusiast.
    Flankers (& others) website at :-
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  9. #9
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    Quote Originally Posted by Flanker_man
    How so ??

    Apart from rigid rotors(?), different blade material, fbw controls - the concept is the same isn't it ?? co-axial, counter rotating rotor blades.

    Or, am I missing something ??

    Ken
    From the aerodynamic and technical standpoint it's very different.
    Kamovs use conventional rotors, just stack them. Stall on such a rotor system makes the blades all flappy, and tip clearance between disks (self mid-air collision) becomes an issue.
    An ABC is extremely rigid and operates beyond stall on the retreating blades. Roll and pitch control of an ABC rely on mixed input from upper and lower disk, whereas on a conventional co-ax each disk mirrors the actions of the other. An ABC can pull about one "g" more than a conventional rotor. And in cruise mode an ABC with a pusher operates more or less in autogiro mode.
    "Distiller ... arrogant, ruthless, and by all reports (including his own) utterly charming"

  10. #10
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    SteveO,

    The background engineering effort was completed, but the UK decided not to fund the integration & test phase.

  11. #11
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    Thanks turboshaft,

    Thats disappointing news, I wonder if we will ever see a operational compound Lynx or Merlin for special ops or CSAR?

  12. #12
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    Quote Originally Posted by junipergoth
    remember the lovely cheyenne from the late 60s/ear;y 70s? now that was a real great bird, looks a killer and stunningly capable. more like a jet fighter than a chopper. i believe it couldnt hover though? well looks like the new bird a bit by sikorsky, prop at the back and similar shape. i think speed of the cheyenne was over 200 knots so quite close to the new bird. just lost out in hovering regime...
    In fact it looks like the merger of the ABC and the Cheyenne. Both uses the rigid rotor and some kind of direct thrust for forward flight.
    Country::US of A

  13. #13
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    Sikorsky heavy lift

    The X2 looks interesting, particular in light of Sikorsky's proposal for the joint heavy lift programme for the Army and Marines. Not much has been released on Sikorsky's proposal other than it will carry its payloads under slug with service crew in the cabin. (Bell proposal looks more interesting)

    Artists impression of Sikorsky's proposal and Lynx ABC type proposal by westland.
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  14. #14
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    The Sikorsky JHL offering now also features a high-bypass ducted prop/fan either side of the fuselage (i.e. compounded propulsion).

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