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    Promising high-speed helicopter (PSV)

    GarryB
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    Post  GarryB on Wed Apr 24, 2019 2:22 pm

    All I'm saying is they could take the Eurcopters' proven design, and add the Kamov's coaxial rotors, and also add the coaxial counter propellers seen on the Tu-95's, maybe with the difference of having the propellers attached to the ends of the rear tail wing, and have two additional wings in the front with weapon pylons.

    What eurocopter proven design... they put two turboprop engines on the wing tips of a helicopter... 50 years ago Mil put four jet engines on the wing tips of a helicopter too it is hardly new ground breaking stuff...

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    magnumcromagnon
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    Post  magnumcromagnon on Wed Apr 24, 2019 3:26 pm

    dino00 wrote:In JSC "Kamov" have developed a project synccopter, which can accelerate to 420 km / h

    Formed a general view and layout, as well as calculated aircraft performance characteristics of the aircraft, according to the developer’s presentation

    MOSCOW, April 24th. / Tass /. Kamov JSC (part of the Russian Helicopters holding) has developed a conceptual design of a prospective high-speed helicopter of a synchroter (or synchroopter) scheme with two main and one pusher propellers. The maximum design speed of the car reaches 420 km / h, follows from the presentation of the developer, a copy of which is available to TASS.

    A synccopter is a helicopter, in which two screws are mounted at a short distance from each other and rotate in opposite directions, while the trajectories of their blades intersect, the screws rotate "overlap". In order for the blades not to collide, their rotation is mechanically synchronized.

    The simulation showed the advantage of such a scheme - the efficiency is higher by 4% compared to the single and coaxial schemes, there is no disruption of the air flow from the screws, which occurs at high speeds. It is because of this effect that the helicopters of the classical schemes have reached their speed limit. Also, to increase the speed in the tail, a pushing screw was installed, the blades received tips of a special form, and their speed of rotation was reduced from 220 to 180 m / s.

    According to the presentation materials, the design result was a high-speed passenger helicopter with the following characteristics: take-off weight of 6500 kg, payload mass of 1000 kg, cruising speed of 357 km / h, maximum speed of 420 km / h, static ceiling of 4700 m, dynamic ceiling of 5600 m, range of 1228 km.

    More
    https://tass.ru/armiya-i-opk/6368633

    Kamov don't throw the towel attack

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    hoom

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    Post  hoom on Fri Apr 26, 2019 6:24 am

    Yes thats how I interpret that wording.
    Pretty interesting.

    That layout was used in some of the earliest helicopters, always seemed super counter-intuitive & dangerous to me -> evolution away from that to the 'conventional' single rotor plus tail rotor.

    But when you get your head around how they actually work mechanically it gives the advantages of contra-rotors while keeping large separation between the blades.
    Normal contra-rotors get a compression pulse when the blades pass over each other but with this layout they never really actually cross.
    Limits the number of blades though.
    GarryB
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    Post  GarryB on Sat Apr 27, 2019 4:40 am

    Eliminates the need for a serious gearbox like a contrarotating mechanism, but I would suspect it would also influence flight performance like the ability to yaw the nose... with a tail rotor the tail rotor is only effective at low flight speeds because it is relatively small and at higher speeds the wind induced aerodynamic forces are fairly strong.

    With coaxial rotor layouts the momentum force of an entire set of main rotors (two sets, one going each way of course) means rudder turns or yawing can be performed over a much wider range of speeds forward backward or sideways...

    With this arrangement, I am guessing that is what the large tail structure is for which suggests yaw control would be most effective at reasonable forward speeds.
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    hoom

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    Post  hoom on Tue May 14, 2019 8:26 am

    Not sure where he got it but Charly015 appears to have a pic of the proposed config http://charly015.blogspot.com/2019/05/kamov-de-alta-velocidad.html
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