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"Mishka" from Russia

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  • "Mishka" from Russia

    Hello.
    I designed the "Mishka" (teddy bear) tractor autogyro, which flew in 2011.
    I leisurely talk about his design.
    If you have questions about its design, I can answer in detail.
    Evgeny.
    Mishka in flight

  • #2
    My friend Mikhail Kiselev and I designed and maded an autogyro in the Amateur Aviation Creativity Club of the village Mendeleevo near Zelenograd of the Moscow Region.
    Thinking over the construction of the future autogyro, we agreed that the open pushing Dominator autogyro is very good ... for California. But not suitable for Russian weather conditions.
    We decided that it should be a tractor autogyro on a design similar to the Little Ving, but with a side-by-side landing crew.
    It is known that the tandem arrangement of the crew allows to reduce the weight of the fuselage structure and reduce aerodynamic drag. But in flight without a passenger, the pilot sits in the back seat and has a limited view.
    As a result, you see a gyroplane, which we called "Mishka".
    3-View & Cutaway

    Comment


    • #3
      Design
      The fuselage and the tail section are made of thin-walled steel pipes by welding.
      The fuselage and tail are covered a fabric.
      The 40-liter fuel tank is made from two aluminum cans. It is located behind the pilots.
      The fuel tank neck is located on the right.

      Comment


      • #4
        Cabin
        The cabin is relatively comfortable, with large doorways and the location of the crew "side by side."
        Two people 1.8 m tall fit into it normally.
        Elbows do not interfere.
        Seat backs can be rearranged under the growth of the pilot in a small range.
        Windshield - curved polycarbonate.
        The door frame is welded from thin-walled steel pipes.
        On the contour of the door glued rubber profile.
        The glazing of the door is convex, made of plexiglass. This made it possible to painlessly increase the width of the cabin in the area of ​​the elbows and not to “inflate” the fuselage.
        When opened, the doors are raised and fixed with a gas shock absorber.
        The instrument panel is mounted on rubber shock absorbers. It has the necessary set of aviation instruments, located mainly on the left.

        Comment


        • #5
          Сontrol
          The control of the autogyro consists of a set of pedals and two handles.
          Unregulated pedals, the standard for light aircraft design.
          The control post is located in the center. Two sticks are attached to it.
          On the left handle there is a brake lever and a control lever for preliminary rotation of the rotor.
          The engine controls are located on the bottom left of each seat.
          Between the seats is a flywheel to control changes in the angle of the stabilizer.
          There is a cable wiring for steering and rudder control.
          The rotor hub is controlled by two rods.
          The control system has an elastic damper. The design of the damper is extremely simple. The intermediate rocking chair has a horizontal hinge, in which the silentblock is installed. The control system rods are connected via a silent block.
          This is an elastic connection between the lower and upper control rods.
          Each control channel of the hub of the rotor is equipped with an electric trimmer. Control trimmers located on the dashboard.

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          • #6
            Mast
            The autogyro mast is a 80x60x4 mm rectangular beam, the material is aluminum (AD31T).
            It is located behind the back of the crew. This provided a good overview, but increased the bending load on the mast beam.
            The mast is mounted on two swivel supports to the frame of the fuselage.
            The supports have rubber bushings to reduce vibration.
            The upper support is made in the form of a clamp. The bottom support is made in the form of two plates with several holes that allow you to move the mast
            Thus, the location of the rotor varies relative to the center of mass of the gyroplane.
            You can detach the lower support bolt and tilt the mast back by turning it around the upper attachment point to reduce the height of the gyroplane during transport or storage in the garage.

            Comment


            • #7
              Rotor
              The rotor was selected "DragonWings" 28 feet. This rotor is tested and reliable, has low weight among competitors and high aerodynamic quality. Although he has a little inertia.
              A self-made rotor sleeve, similar to the rotor “DW II” rotor hub, is equipped with flapstoppers and a brake.
              The angle of inclination of the rotor hub forwards ensures the horizontal position of the plane of rotation of the rotor during taxiing.
              The rotor pre-ritation system is hydraulic with inertial bendix.
              Drive promotion of the main rotor of its own design, friction with a poly V-belt of constant tension. The friction clutch drive is a cable drive from a special device operating from a vacuum in the engine intake channel.

              Comment


              • #8
                Chassis
                The autogyro has a chassis with a tail wheel.
                Carrying out the chassis, i.e. anti-hauling angle, significantly more than is customary for aircraft.

                Our thoughts were as follows.
                1. During the takeoff run, the pulling propeller acts as a stabilizing factor. The instability of such a scheme of the chassis is manifested mainly on the run when landing. But, the gyro lands without a run.
                2. Autogyros do not have to change the fuselage angle during takeoff because its rotor has a gimbal. Take-off can be carried out simultaneously from three wheels.
                3. The propeller can have the largest diameter possible; it is not limited from above by the rotor disk.
                4. The scheme of the chassis with the wheel located at the rear is more resistant to tipping over than the three-wheel scheme with the wheel located at the front; designers of three-wheeled vehicles know this.
                5. The location of the fuselage parked at an angle to the horizon reduces the height of the threshold of the cabin. There is no need for a “landing bench”, which belongs to high profile gyroplanes.

                A detailed study of the chassis of the autogyro Siervа S-30 dispelled our doubts.
                The track of the main chassis was chosen 2 m.
                The main landing gear is pyramidal, welded from steel thin-walled pipes, have rubber-cord amortisation. Main wheels are equipped with drum brakes.
                The drive of brakes is cable from the common lever located on the left control stick.

                The tail wheel is driven. It was originally small, on a metal spring. Subsequently, according to the test results, the wheel was replaced with a larger diameter and width, and its plug was mounted on a plastic spring. In this case, the total weight of the tail support became less, and the permeability improved.

                Comment


                • #9
                  Tail
                  The tail of the autogyro has two vertical tail.
                  Dual vertical tail is not obscured by a wide fuselage.
                  The tail frames are welded from thin-walled steel pipes.
                  Pipe material is mild steel.
                  Coverage - fabric.
                  Free-standing stabilizer without braces.
                  Cantilever wing
                  There is a mechanism for changing the angle of installation of a horizontal tail in flight in the range from 0 to -5 degrees mechanically driven from the cabin. The test results confirmed that the adjustable stabilizer perfectly balances the gyroplane at different flight speeds, which gives an increase in the flight speed to 15 km / h. The stabilizer area is sufficient.
                  Vertical tail made the same. The rudder angles are ± 25 degrees.

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                  • #10
                    Autogyro flew without problems.
                    The first flights showed good stability and controllability of the autogyro.
                    In the cabin - warm.
                    The view from the cockpit, of course, is not as good as that of the pushing gyroplane, but also not bad, better than that of an airplane.
                    Vibrations are few.
                    Test pilot Vadim Alexandrov loved the autogyro. He knows autogyros. He is one of the pilots who have long flown on this technique, an amateur designer.
                    The first flights were performed with the engine Rotax 912 - 80 hp
                    Currently installed Rotax 912ULS (100 hp), which added thirty percent thrust and improved flight performance.

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                    • #11
                      Empty weight - 280 kg
                      Flight Videos:
                      https://www.youtube.com/watch?time_c...&v=gC_NO3jEdXk
                      https://www.youtube.com/watch?time_c...&v=Fy8lz4LCKwI
                      & Fresh photos

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                      • #12
                        Congratulations. Nice work. Well done.

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                        • #13
                          Very nice. More detail on the adjustable horizontal stabilizer, please. What is the mechanism, mechanical screw?

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                          • #14
                            Yes, mechanical screw.

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                            • #15
                              Superbe Autogyro I love it

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