Military Review

US decided to upgrade synchroters

50
The American company Kaman Aerospace has announced its intention to develop improved versions of unmanned and manned synchropters of the K-Max family, the world's only serial aircraft of this class. According to Flightglobal, the decision to upgrade the helicopter was made after the successful delivery of the first machine, released as part of the resumed production.


US decided to upgrade synchroters


A distinctive feature of K-Max synchropters is the transverse arrangement of two rotors, the planes of rotation of which are angled to each other and intersect. The rotation of the screws is synchronized and produced in opposite directions. It is believed that such a scheme greatly simplifies the control of the helicopter in hover mode or at low speed.

K-Max with a length of 15,8 and a height of 4,14 meter is equipped with screws with a diameter of 14,7 each. The maximum take-off weight of the device is 5,4 tons. Synchropper can reach speeds of up to 185 kilometers per hour and fly over distances up to 500 kilometers.

Kaman Aerospace resumed production of K-Max synchrosters, which ceased in 2003, in June, 2015, and in July, 2017, delivered the first such helicopter to the customer. The company is currently engaged in assembling the first batch of ten synchroters.

These machines, developed in the second half of the 1980-ies, are equipped with obsolete avionics and refurbished Honeywell T53 turboshaft engines. The latter were created in the middle of 1950's.

Kaman Aerospace said that the upgraded version of the K-Max will receive a new more powerful turboshaft engine, as well as a new on-board electronics. In addition, the synchroopter case and its rotors will be subjected to some modifications.

Today in the world fly around 40 K-Max synchros. Most of them belong to the United States Marine Corps. The helicopters were also delivered to the ground forces of Colombia and civilian companies in Germany, New Zealand, Peru and Switzerland, reports the scientific portal "N + 1"
Photos used:
http://www.carpictures.pro/
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  1. 210ox
    210ox 1 March 2018 14: 13
    +8
    His appearance is somehow ... Tired ..
    1. Sofa General
      Sofa General 1 March 2018 14: 20
      +3
      I can’t even imagine how IT flies ...
      I really can’t - how the screws do not hurt each other?
      1. Angel_and_Demon
        Angel_and_Demon 1 March 2018 14: 22
        +12
        Quote: Sofa General
        how screws do not hurt each other?

        the synchronizer is standing and their planes are at an angle
        1. shuravi
          shuravi 1 March 2018 14: 48
          +3
          Quote: Angel_and_Demon
          Quote: Sofa General
          how screws do not hurt each other?

          the synchronizer is standing and their planes are at an angle


          What the hell is a synchronizer? There is one gearbox but with two shafts.
          1. Angel_and_Demon
            Angel_and_Demon 1 March 2018 15: 04
            +4
            Quote: shuravi
            A distinctive feature of the K-Max synchroppers is the transverse arrangement of two rotors, the rotation planes of which are angled to each other and intersect. The rotation of the screws is synchronized and performed in opposite directions.

            Have you read the article carefully?
            1. Shurik70
              Shurik70 1 March 2018 18: 13
              +2
              Quote: Sofa General
              how screws do not hurt each other?

              Google to the rescue
            2. shuravi
              shuravi 1 March 2018 19: 51
              0
              Quote: Angel_and_Demon
              Quote: shuravi
              A distinctive feature of the K-Max synchroppers is the transverse arrangement of two rotors, the rotation planes of which are angled to each other and intersect. The rotation of the screws is synchronized and performed in opposite directions.

              Have you read the article carefully?



              They made fun. laughing
      2. 210ox
        210ox 1 March 2018 14: 23
        +2
        Try to imagine how a machine gun shoots through a screw ...
        Quote: Sofa General
        I can’t even imagine how IT flies ...
        I really can’t - how the screws do not hurt each other?
      3. Ushly_bashkort
        Ushly_bashkort 1 March 2018 14: 24
        0
        Screw synchronization, as with a machine gun in PMV screw synchronized.
        1. Sofa General
          Sofa General 1 March 2018 14: 25
          +1
          I just watched a video on YouTube - yes, it flies, but anyway - for me it is too difficult ...
          1. shuravi
            shuravi 1 March 2018 14: 49
            +14
            Quote: Sofa General
            I just watched a video on YouTube - yes, it flies, but anyway - for me it is too difficult ...


            Present your wife on 8 March a new mixer, take the old one apart and understand everything. laughing
            1. Sofa General
              Sofa General 1 March 2018 15: 03
              +2
              I can’t ... my wife has a brand new mixer ...
              but I liked the idea of ​​disassembling the old one ...
            2. faiver
              faiver 1 March 2018 17: 35
              +1
              five points laughing
      4. dauria
        dauria 1 March 2018 14: 51
        +13
        I really can’t - how the screws do not hurt each other?


        Yes, spinning from one gearbox, and in different directions, what is unclear here? Gears do not know how to "slip" - this is the angle and is constant. And the planes are tilted - the blades of the left pass OVER the sleeve of the right (and vice versa). The scheme is ancient, applied by the German Flettner.
      5. Dead duck
        Dead duck 1 March 2018 15: 30
        +6
        Quote: Sofa General
        I can’t even imagine how IT flies ...

        It flies great.
        The “crazy teutonic genius” used them during the Second World War.
    2. gukoyan
      gukoyan 1 March 2018 14: 22
      0
      He was saddened by the little one)
  2. Antares
    Antares 1 March 2018 14: 17
    +2
    normal machine. Will serve more.
  3. lexx2038
    lexx2038 1 March 2018 14: 20
    +5
    In theory, such a scheme should be close in terms of performance characteristics to Kamov helicopters - if brought to mind.
    1. Avis-bis
      Avis-bis 1 March 2018 15: 12
      +8
      Quote: lexx2038
      In theory, such a scheme should be close in terms of performance characteristics to Kamov helicopters - if brought to mind.

      "Ett-vryayadly ...". :)
      Something IMHO that in the place of mutual overlapping of the cones the screws really interfere with each other flow. On coaxial helicopters, PMSM, everything is more symmetrical. Purely intuitively it seems that he will have a craving, other things being equal, lower than that of his co-alignment.
    2. Kurare
      Kurare 1 March 2018 21: 13
      +3
      Quote: lexx2038
      In theory, such a scheme should be close in terms of performance characteristics to Kamov helicopters - if brought to mind.

      The maneuverability of such a system is simply phenomenal, very similar to a dragonfly. Just like the Kamov scheme, it’s very complicated, as for the air flows and the mechanical part. Like Kamov cars, it is perfect to hang in one place, for example, for installation work. Equal efficiency with coaxial design. Although, as I read, in speed, such machines are inferior to co-drivers.
      Big minus: you can approach the synchroper only in front or behind, otherwise, due to the tilt of the screws.
      Actually, in my opinion, the scheme is not well understood, but very interesting.
  4. Same lech
    Same lech 1 March 2018 14: 21
    +5
    https://topwar.ru/?newsid=77499


    There was an article on VO about synchrometers ... smile
    1. Vasyan1971
      Vasyan1971 1 March 2018 14: 34
      0
      Do you remove firewood through the air? You cannot forbid beautiful living, however. Is that possible to interfere.
      1. Avis-bis
        Avis-bis 1 March 2018 15: 20
        +5
        Quote: Vasyan1971
        Do you remove firewood through the air? You cannot forbid beautiful living, however. Is that possible to interfere.

        In many mountainous countries, helicopters are used for skidding. For example, Ka-32. So as not to use a flying crane and the removal of "construction waste"? In the USA, for example, with MD-500 power lines are served and tree crowns are pruned.
  5. Piramidon
    Piramidon 1 March 2018 14: 30
    +4
    The Germans used such a helicopter scheme back in World War II. They wrote that in these aircraft, with a sharp change in mode, the screws are laced up.

    1. prodi
      prodi 1 March 2018 14: 53
      0
      from overlap, they should be even better than coaxial, but to imagine at least three-blade screws is already difficult
      1. Avis-bis
        Avis-bis 1 March 2018 15: 14
        +5
        Quote: prodi
        it’s already difficult to imagine at least three-blade propellers

        Look at the B-12th five-blade screws. True, there the degree of overlap is an order of magnitude less.
        1. prodi
          prodi 1 March 2018 16: 19
          0
          that is, there are only the ends of the blades, like gears in engagement, and here we get a rapprochement of varying length along the blades - the greatest at the bushings, where the blades have the least freedom, and the smallest at the ends. With the increase in the number of blades, their safe spacing (especially at the ends) will decrease
          1. Avis-bis
            Avis-bis 1 March 2018 16: 25
            +5
            Quote: prodi
            With the increase in the number of blades, their safe spacing (especially at the ends) will decrease

            Will not: there security depends on degrees, not centimeters. The forward-backward blades do not wave enough to “select” a gap of tens of degrees.
            Another question is that the greater the overlap, the PMSM, the lower the VMG thrust - the screws interfere with each other.
            1. prodi
              prodi 1 March 2018 17: 16
              0
              here at mi-12 - yes, there is unlikely to be a lashing there, the blades are located in one plane and degrees decide everything. And here, like the co-aligner, there are also centimeters
              1. Avis-bis
                Avis-bis 1 March 2018 21: 50
                +5
                Quote: prodi
                here at mi-12 - yes, there is unlikely to be a lashing there, the blades are located in one plane and degrees decide everything. And here, like the co-aligner, there are also centimeters

                No.
  6. Altona
    Altona 1 March 2018 14: 36
    +1
    Quote: lexx2038
    In theory, such a scheme should be close in terms of performance characteristics to Kamov helicopters - if brought to mind.

    --------------------------
    Some garbage, to be honest. Ugly duck.
  7. Hort
    Hort 1 March 2018 14: 42
    +1
    curious pepelats
  8. san4es
    san4es 1 March 2018 14: 48
    +1
    The rotation of the screws is synchronized due to the presence of a rigid mechanical connection between their shafts, which ensures the prevention of collision of rotating blades in flight. It is believed that the use of this scheme simplifies the control of the aircraft in hovering mode or at low speed, and also allows you to save fuel by refusing to transfer rotation to the tail rotor.


    PLA and UAV
  9. kos2910
    kos2910 1 March 2018 15: 01
    +1
    No, the principle is clear, but the flexibility of the blades has not been canceled. The probability of lashing with strong gusts of wind or sudden maneuvering is very real
    1. Avis-bis
      Avis-bis 1 March 2018 15: 16
      +6
      Quote: kos2910
      No, the principle is clear, but the flexibility of the blades has not been canceled. The probability of lashing with strong gusts of wind or sudden maneuvering is very real

      If, indeed, the blade spacing angle is provided with rigid gears, then there will be no grip. The aligner is more likely. And they visited the Kamovs.
    2. Vorchun
      Vorchun 1 March 2018 16: 12
      +1
      Magazine "Modeller Designer" No. 2, 1982, pp. 11-12 model of such a scheme.
      - http://publ.lib.ru/ARCHIVES/M/''Modelist-konstr
      uktor '' / _ '' Modelist-konstruktor '' _ 1982_.htm
      l
  10. Evgeny Strygin
    Evgeny Strygin 1 March 2018 16: 50
    +1
    directly the embodiment of futility. Zero prospects.
    1. Aqr009
      Aqr009 1 March 2018 18: 41
      0



      According to Kaman, a crossover rotor helicopter scheme is most effective when performing operations with vertical lifting of loads, since it provides a reduction in power consumption, structural mass, noise level, vibration, maintenance costs, as well as safety associated with the absence of tail rotor.

      Helicopter systems are maximally simplified, the helicopter is designed with the minimum maintenance requirements in the field. There are no hydraulic drives, servo-flaps of the rotor blades provide small efforts on the control handle; manual flight control. The electrical system uses only direct current; The lead acid battery is maintenance free.

      They are used in conditions of high mountains and limited space just because of less reactivity in gas (pulled the handle - the helicopter jumped up) and, due to the overlap of the screws and the absence of the steering, are less likely to hook something.

      I’ll add from myself, if I attach a pushing screw from behind, then a good high-speed synchroper can turn out.
      1. Evgeny Strygin
        Evgeny Strygin 2 March 2018 08: 12
        +1
        pay attention that with all these magnificent advantages of the existing one, no one has been using the scheme for a long time. Implementation is worthless.
        I am afraid of a pushing screw, and so a difficult situation with air flows can still complicate specifically.
        This is an example of the good use of two screws for a specific task. This is an elevator.
        Lifting goods in the highlands is generally the only thing that comes to mind. Of course I could be wrong, but that’s probably all.
  11. Vasya Vasiliev
    Vasya Vasiliev 1 March 2018 18: 04
    +1
    stucco molding from shit- sweets!))) the fact that it flies is understandable! the question is the practicality and relevance of this device!)))
  12. APASUS
    APASUS 1 March 2018 20: 46
    0
    Kamov’s helicopters have such a dangerous feature as screw sweeping. These cars don’t suffer from such a defect. Interesting
    1. Avis-bis
      Avis-bis 1 March 2018 21: 53
      +5
      Quote: APASUS
      Kamov’s helicopters have such a dangerous feature as screw sweeping. These cars don’t suffer from such a defect. Interesting

      Whipping.
      Synchroptors have other problems. And the first (this is my opinion) is the loss of efficiency due to the partial overlap of the screws. The alignment of the coaxial is symmetrical - one screw is strictly above the other.
      1. Setrac
        Setrac 1 March 2018 22: 30
        0
        Quote: Avis-bis
        Synchroptors have other problems. And the first (this is my opinion) is the loss of efficiency due to the partial overlap of the screws. The alignment of the coaxial is symmetrical - one screw is strictly above the other.

        But the maximum speed of the synchroopter is not limited by the speed of rotation of the blades.
        1. Avis-bis
          Avis-bis 1 March 2018 22: 36
          +5
          Quote: Setrac

          But the maximum speed of the synchroopter is not limited by the speed of rotation of the blades.

          Just don’t say that the co-alignment is limited. :) I hope you will not refuse to give the example of a synchropper with a maximum speed of 390km / h? (Yeah, this is me about the Ka-50 / -52 family :)).
          1. Setrac
            Setrac 2 March 2018 18: 49
            0
            Quote: Avis-bis
            I hope you will not deny the courtesy to give an example of a synchroopter with a maximum speed of 390km / h?

            I only speak theoretically.
            1. Avis-bis
              Avis-bis 2 March 2018 19: 41
              +5
              Quote: Setrac

              I only speak theoretically.

              Nude ...
      2. fedotow
        fedotow 2 March 2018 01: 20
        0
        Let me intervene?
        The scheme is in fact long known, but it does not apply. The whip of screws practically does not threaten her. There is some loss of load capacity due to slipping (both screws are installed with a slope). But one could put up with this. The main disadvantage is that when the blade is damaged, for example, during shelling, or breakdown, the machine starts to rotate around its axis, and nothing can be done about it. For example, with a coaxial circuit, you can increase the speed of rotation of a damaged screw. And here the screws always rotate at the same speed.
        1. Avis-bis
          Avis-bis 2 March 2018 07: 25
          +6
          When a blade breaks, any helicopter is doomed - asymmetry will blow any rotor in a couple of seconds.
  13. Sasha75
    Sasha75 2 March 2018 00: 07
    0
    That's really someone saws the loot. This country will destroy corruption Mark Twain.
  14. shuravi
    shuravi 2 March 2018 12: 10
    0
    The main drawback of this scheme is just the tilt of the screws to the sides .. Part of the thrust they create is wasted.
    Tz1 and Tz2 in horizontal flight simply cancel each other out.