Military Review

Promising high-speed helicopter SB1 Defiant tested at two-thirds of the engine power

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Promising high-speed helicopter SB1 Defiant tested at two-thirds of the engine power

The promising multipurpose high-speed helicopter SB> 1 Defiant, developed by a consortium of Sikorsky and Boeing, flew for the first time at two-thirds of the engine power. According to Flightglobal, the helicopter was able to accelerate to a speed of 211 knots (390,7 kilometers per hour).


The helicopter developers tested the machine at two-thirds of the engine power in two stages. In the first phase, the helicopter flew in a straight line and was able to reach a speed of 211 knots. At the second stage, the car was tested in a decrease in the same way with the engine running at two-thirds of its power. At this stage, a speed of 232 knots was reached. The tests were found to be successful.

Development of SB> 1 has been underway since 2015. The creation of SB> 1 is carried out on a competitive basis within the framework of the US Army program for the development of helicopters of a new concept for the creation of a family of promising army vehicles. aviation... The first built prototype of the SB> 1 demonstrator was shown on December 26, 2018.

According to the requirements of the American army, the new helicopter must carry 12 fully equipped infantrymen at a cruising speed of at least 230 knots (about 428 km / h) for a range of at least 229 nautical miles (424 km).

The SB> 1 helicopter uses Sikorsky's new main rotor system that combines coaxial counter-rotating rotors with a tail rotor driven by a rotor gearbox. This scheme was tested on the demonstrator of the 2015-ton S-5 Raider helicopter, which has been tested since May 97, with a "passport" maximum speed of 444 km / h and a cruising speed of 407 km / h.

The maximum takeoff weight SB> 1 is declared at 32000 lb (14515 kg), with a capacity of up to 18 people. The helicopter is equipped with modified Honeywell T55 turboshaft engines with a take-off power of approximately 4000 hp and a cruising speed of 460 km / h.

The competitor to SB> 1 Sikorsky and Boeing in the program to replace the US Army's helicopter fleet is the V-280 Valor tiltrotor of the Bell and Lockheed Martin consortium, the prototype of which has been flight tested since December 18, 2017.
Photos used:
Sikorsky
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  1. Operator
    Operator 15 October 2020 11: 18
    -13 qualifying.
    One ton of take-off weight per passenger - won't take off laughing
    1. Mountain shooter
      Mountain shooter 15 October 2020 11: 53
      +7
      Quote: Operator
      One ton of take-off weight per passenger - won't take off

      Already flying. Of course, the shaft and the pusher propeller reduce the payload due to their weight, but the speed under 500 km / h and helicopter take-off and landing plus 18 paratroopers - well, at least a serious vehicle for rapid reaction units. All these "tiltrotors" seemed to me too sophisticated for military equipment.
      1. Alex777
        Alex777 15 October 2020 13: 56
        -2
        The Yankees have heavy helicopters more expensive than planes.
        Sikorsky CH-53K King Stallion is worth more than $ 130.
        I wonder how much this thing will cost and how much can they build / purchase?
        https://rg.ru/2017/04/20/novyj-vertolet-ssha-okazalsia-slishkom-dorogim.html
      2. prodi
        prodi 15 October 2020 15: 18
        0
        quite right; in comparison with a tiltrotor, this machine will lift more (more efficiently) in a helicopter, and will be more reliable
  2. Narak-zempo
    Narak-zempo 15 October 2020 11: 29
    -16 qualifying.
    In 5 years they will experience 3/4 laughing
    The saw sound from this project is downright deafening.
    1. Interlocutor
      Interlocutor 15 October 2020 11: 37
      -9
      The saw sound from this project is downright deafening.

      Her. This is a natural reward for years of work.
    2. venik
      venik 15 October 2020 12: 22
      10
      Quote: Narak-zempo
      In 5 years they will experience 3/4 laughing
      The saw sound from this project is downright deafening.

      ========
      One feels "expert" .... For your information, the rotor aerodynamics at high speeds is a "thing in itself" - no one can really calculate it mathematically (even for a "traditional" tail rotor scheme). And only for a coaxial, and even with a pushing screw ... what I'm not even talking about purely technical difficulties!
  3. Alien From
    Alien From 15 October 2020 11: 46
    -8
    Beautiful photo. The spinner is not very good.
  4. Zaurbek
    Zaurbek 15 October 2020 12: 01
    -1
    The helicopter is equipped with modified Honeywell T55 turboshaft engines with a take-off power of approximately 4000 hp and a cruising speed of 460 km / h.

    Is it about 2x VK2500?
  5. Angelo Provolone
    Angelo Provolone 15 October 2020 12: 05
    +3
    Powerful engines + pushing propeller = 430 km / h with a take-off weight of 14 t
  6. Russian2020
    Russian2020 15 October 2020 20: 21
    -2
    Mi 17 terminator two engines of 2.5 thousand horsepower, made in Russia
  7. Ax Matt
    Ax Matt 16 October 2020 00: 46
    0
    Author! In Russian it is written: at two-thirds of the power ... Otherwise, you suffer. poor man: you don't know how to write ... laughing