HE DOESN’T NEED WINGS

HE DOESN'T NEED WINGSThe story of the creation of our gyroplane, received subsequently the name DAS-2M has been around for many years. First autogyro DAS took to the air in a motorless version towed by a car “Zhiguli”. It happened on one of the airfields of agricultural equipment until near Tula. After the first flight, we realized that the unit managed. But it took another few years, during which time we worked on the engine before experienced test pilot LII V. M. Semenov after just one run raised DAS-2M in the air. The event was marked in the future on the contest ALS special prize of OKB M. L. Mil, which is notified readers of the magazine “modelist-Konstruktor”. The apparatus, according to the test pilot, has good flight characteristics and effective management.

 
As experience has shown, the gyro is first of all a good powertrain. No wonder the last nine years was given to him. During this time he developed twin-cylinder boxer engine, which allowed to obtain the static thrust of 145 kg, and allowed the autogyro to successfully rise into the air.
 
DESIGN GYROPLANE DAS-2M
 
The fuselage truss, tubular, collapsible design. The main element of the fuselage is a frame consisting of horizontal and vertical (pole) pipe diameter 75×1 made of steel 30KHGSA. They are mounted towing hitch with lock and receiver air pressure, the dashboard, the pilot seat, secured with seat belt, control unit, tricycle, with a nose steerable wheel chassis mounted on motorhome power unit with a pusher propeller, stabilizer, keel with rudder ball joint to the rotor. Under the keel mounted auxiliary tail wheel with a diameter of 75 mm. together with the Pylon struts with a diameter 38×2 length 1260 mm, tubular beams of the main wheels with a diameter of 42×2 in length, 770 mm, made of titanium alloy VT-2, and braces, diameter 25×1 length 730 mm of steel 30KHGSA form spatial power frame, the center of which is the pilot. With the horizontal tube of the fuselage and the ball joint of the main rotor pylon connects with titanium rails. In the installation of the scarves in the tubes is established the bougies made of aluminum В95Т1.
Power unit with a pusher propeller. It consists of a two-cylinder boxer two-stroke engine working volume of 700 cm3 with gear, pusher propeller and electric starter, clutch system pre-spin the rotor, the fuel tank capacity of 8 litres and an electronic ignition system. The power unit is located behind the pylon on the engine frame.
 
The engine is equipped with a duplicate electronic contactless ignition system and tuned exhaust system.
 
Pushing the wood screw is driven through a V-belt gear, consisting of master and slave pulleys and six belts. The variability of the torque to the gear dampers installed.
 
The rotor diameter of 6.60 m-bladed. The blades are composed of fiberglass spar, foam padding and covered with fiberglass, installed with a horizontal hinge on the sleeve, placed on the pylon. The ends of the blades located unmanaged trimmers to adjust sockanosset of the rotor. The propeller hub is made of duralumin brand В95Т1. The axis of the main rotor with a diameter of 25 mm, steel 30ХН2МВФА connected with a horizontal hinge, rotates in tapered roller bearings. On the axis of the rotor is installed, the driven gear of the gear pre-promotion and tachometer sensor rotor. The axis of the rotor is placed on a ball joint, which is connected with the top control plug. The last panel is installed with the pinion gear of the gear system prior to the promotion, hosted on the overrunning clutch, and a device of forced separation of the reduction gearbox of pre-promotion of the rotor. The drive gear is made via a cardan-spline shafts, angular gear, mounted on the pylon, and a friction clutch located on the engine. The friction clutch consists of a driven rubber roller mounted on the axis of the propeller-shaft is splined, and the leading dural drum, located on the axis of the engine. Management of a friction clutch carried by a lever mounted on the control handle.
 
Layout gyroplane DAS 2:
 
The layout of the autogyro DAS-2:
 
1 receiver air pressure; 2 – towing lock; 3 – instrument panel; 4 – handle; 5 – control lever friction clutch system of pre-promotion of the rotor; 6 – Parking brake lever; 7 – the pilot seat; 8 – a control lever throttle carburetor; 9 – the lever of the control device of the forced separation of the reduction gearbox promotion; 10 – foot controls; 11 – horizontal tube of the fuselage; 12 – brace; 13 – lower plug of the control system; 14 – driven gear reducer promotion; 15 – struts; 16 pylon; 17 – an axis of a horizontal hinge; 18 – the axis of the rotor; 19 – pinion gear promotion; 20 – the case of the overrunning clutch device and the forced separation of the reduction gearbox promotion; 21 – traction control system; 22 – the prop spline shaft promotion; 23 – carb; 24 – bearing housing clutch of promotion; 25 – thrust screw; 26 – bushing pusher propeller; 27 – electric start; 28 drives the pusher propeller; 29 – gas tank; 30 – main wheel landing gear; 31 Kil; 32 – brace the keel; 33 – rudder; 34 – auxiliary tail wheel;35 – a tubular beam of the main landing gear wheels; 36 – stabilizer screen; 37 console brace; 38 rocking the steering control In the front view of the rotor conventionally not shown.

 
Changes in roll and pitch knob are affecting the bottom plug the control rods associated with the upper fork, which in turn leads to a change of the inclination of the plane of rotation of the rotor. Plugs are connected with the rods of the model compounds using guided bearings. Directional control is the rudder connected cable runs with pedals, which controlled the nose wheel. To compensate for the hinge moment the rudder is provided with a compensator horn type. The rudder and keel symmetrical profile bead 16 made from plywood ribs with a thickness of 3 mm, pine stringers 5×5 mm, covered with percale and coated with nitrocellulose lacquer. A keel mounted on the horizontal tube of the fuselage by means of anchor bolts and two cable braces. The relative thickness of the keel and rudder 5%. Stabilizer area of 0.25 m2 made of plywood with thickness of 3 mm, covered with percale and painted. The stabilizer has a zero angle and also acts as a screen pusher propeller.
 
The chassis of the gyro – tricycle. Front driven wheel size 300×80 mm with pedals connected with a toothed gear with gear ratio 1:0,6, and is equipped with a Parking brake drum with a diameter of 115 mm. Main wheels – with a diameter of 450×100 mm. wheel Track – 1.72 m, base of 1.23 m. the main Tubular beams wheels mounted on a horizontal tube of the fuselage by means of rubber silent blocks, shock absorbers, chassis no. In the winter version landing gear wheels are replaced with skis or skates sizes 1,55×0,2 p.m. In hydrobalance chassis design permits installation of float whose length is 3.5 m, width 1.6 m, displacement – 500 kgs.
The instrument panel is located on the farm towing device. On the instrument panel mounted speed indicator, variometer, altimeter connected to the Pitot, tachometer rotor and pusher screws. On the control handle are toggle switch an emergency stop of the motor and the control handle friction clutch. Levers throttle control of the carburettor and the device forced separation of the reduction gearbox of pre-promotion installed at the pilot seat on the left. On the right there is the ignition switch. To the left of the dashboard is the brake lever of the Parking brake. All drive mechanisms of the autogyro is by cables with budenovskiy shells.
 
Technical characteristics of the gyroplane DAS-2
 
The rotor
 
The diameter of the rotor, m……………..6,60
Sweeping area, m2……………………34,2
The narrowing of the blade……………………………….1,6
The profile of the blade…………………..ACA 23012
The fill factor……………….0,046
The deviation of the rotor axis:
ago………………………………………0…+200
side……………………………………..0.. .+7
Horizontal tail
The scope of the stabilizer, m…………………..0,65
The surface of the stabilizer, m2………………0,25
Shoulder horizontal tail, m…..0,7
The installation angle of the stabilizer…………….0°
Vertical tail
Area, m2…………………………………….0,16
The shoulder of the vertical stabilizer, m………1,2
The area of the rudder, m2…………0,40
The angle of deflection………………………………+30
The fuselage
Width, m…………………………………………0,5
The area of the midsection, m2…………………………0,65
Chassis
Base, m……………………………………………..1,23
Track, m…………………………………………..1,72
Wheel sizes are:
bow…………………………….Ø300×80 mm
the main thing…………………………..Ø450×100 mm
Removal of the main wheels relative to the axis
the rotor (back) mm……………….190
Weight data
Takeoff weight, max…………………….280 kgs
The empty weight of the gyroplane…………………180 kgs
The weight of the fuel……………………………………7 kgs
Specific load…………………..8,2 kgf/m2
Powerplant
Power, HP…………………………………….52
Maximum
the speed screw, 1/min…………………..2500
The diameter of the rotor, m……………………………..1,46
The thrust of the screw in place
(at 2500 rpm), kgf……………………130
Speed
the take-off km/h………………………………….40
landing, km/h……………………………….0
cruising, km/h…………………………….80
max, km/h………………………..100
the rate of climb, m/s…………………….2,0

 
 
V. DANILOV, M. ANISIMOV, V. SMARSHKO, Tula

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