THE GYRO ON A ROPE

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GYRO ON A ROPEModel autogyro designed and built in the laboratory of the Aero modeling club of young technicians of the Siberian branch of the USSR. The author is a graduate of the class of technical physics and mathematics school Ilya Skiba. The model is made in Cordova. In this case adjusting it is easier than Svobodnaya. The design of the autogyro is quite simple. The fuselage, landing gear, empennage, engine mountings — as a conventional cord models. A three-bladed propeller creates lift, rotating from the incoming air flow, that is, using the phenomenon of autorotation. However, the number of blades may be three, four or more.

 

The fuselage (Fig. 1) stacked design, assembled from plywood formers and pine stringers. The basis of the bow is the most simplified engine mount of beech. The front fuselage of rectangular cross-section in the tail — hex. Nasal frames from plywood thickness of 2.5 mm, the rest 1 to 1.5 mm From the sides of the bow section sewn plywood with a thickness of 1 mm at the transition of rectangular cross section in the hexagon fairings made from foam. At the top of the fuselage on the epoxy glued two guides from dural area cross section of 10X10 mm, which installs bracket of the mount of the rotor.
 
Tail inlaid design, the ribs of the fake veneer of 1 mm thickness, edges and spars of pine. The profile of the stabilizer is symmetric, it otnositelnoi thickness 9%. The rudder is deployed to the right by 15°.
 
Chassis tricycle, with a nose wheel. Front wire OVS Ø 3 mm, rear Ø 2,5 mm struts Ø 1,5 mm.
 
On the left side of the model are attached to a small wing in which there is a dural rocking with a thickness of 1 mm and a thrust for attaching a cord from a steel cable Ø 1 mm (Fig. 2). The axis of rotation of the swing 10 to 15 mm behind the center of gravity of the model. Wing of duralumin D16T with a thickness of 0.5 mm is glued into the fuselage is epoxy resin.
Engine Polet, converted into compression option; power 0,35—0,38 HP with the working volume of 5.6 cm3.
 
Tank with a volume of 40 cm3 normal for the cord model design is located immediately behind the front bulkhead of the fuselage.
 
Model macalintal covered with color paper.
 
Fig. 1. General view of the model
 
Fig. 1. General view of the model:
 
1 — guide, 2 — stringer, 3 — plywood plate, 4 — motor, 5, 7 frames, 6 — stringer.

 
The rotor is the most complex part of the model. The blades stacked design. Ribs from phony veneer of 1 mm thickness, edges and spars of pine. Profile on the blades PLANO-convex, the relative thickness of 10%. The metal parts of the rotor are mostly made of D16T (Fig. 3). For ease of rotation applied to the bearings. The clamping of the rotor provides adjustment of the angle of inclination of its axis and the angle of the blades. The node itself can move along the fuselage on the grooves in the guide, it gives the ability to change the position of the centre of gravity of the model with respect to the axis of rotation of the screw.
The angle of the axis of the screw (in the range of 3-10° to the vertical) can be adjusted by moving forward or back plate, into a hole which enters the lower end of the axis. The installation angles of the blades are changed in the range from -5° to +5° with the adjusting nut, which moves the drive leads along a vertical axis and simultaneously rotate all three blades. The disc is pressed against the nut by a spring. The blades are fixed to the hub by screws M3.
 
Fig. 2. Control system
 
Fig. 2. Control system:
 
1 — screw М3Х12. 2 — rail, 3, 7 — nuts M3, 4 — washer (PCB), 5 — chair, 6 — wing, 8 — screw М3х20, 9 — pull rudder.

 
Fig. 3. The clamping of the rotor
 
Fig. 3. The clamping of the rotor:
 
1 — guide, 2 — arm, 3 — plate, 4, 13 — axis, 5, 12 bearing, 6 — tumbler, 7 — spring, 8 — disc, 9– adjusting nut, 1L — blade 11 — the hub of the screw 14, the screw М3Х10, 15 — nut 16 — leash 17 — ring 18 — screw М2Х5, 19, 22 — screws М3Х8, 20 — screw М3Х16, 21 — nut M3.

 
Starting autogyro produced in the same way as a conventional cord models. The first flight, preferably, in the shortened cords (10-12 m). When longitudinal instability, that is, the swing model in the longitudinal plane to move the model’s center of gravity forward (bracket to move along the guide back).
 
If after stopping the motor the model is very quickly reduced, it is necessary to increase the installation angles of the blades. The speed of rotation of the rotor is regulated by small changes of the angle of inclination of its axis, increasing the angle speed of rotation increases.
 
TECHNICAL DATA GYROPLANE
 
Weight, g — 1100
Weight is not the unit square drive screw, g/DM2 is 7.1
Weight is not a unit of area of the blades, g/DM2 — 75
The area of the blades, DM2 is 14.8
The surface of the stabilizer, DM2 — 8,6
Specific mass, kg/HP — 3

 
 
B. GORSHKOV, Novosibirsk, Russia

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