On 37-th Moscow city competition of young men in the micro models, held at the tennis court “Dynamo”, the attention of fans and athletes drew suddenly appeared in the air brightly colored model airplane. She almost silently circled the ceiling of the court, and after a minute or two gently landed. On refilling the tank and running the engine only took 30 seconds and was again in flight. This model installed on the original engine it says the author is the head of the aircraft modeling lab of the Moscow House of young technicians of a name of P. I. Baranov master of sports I. SHKALIKOV.
Aircraft model (Fig. 1) made of balsa at the scheme. The two-spar wing has a 16 10 full and shortened ribs. Attached to the fuselage with rubber bands. The center section is sewn balsa with veneer 0.6 mm thick. To maintain the shape of the profile between the ribs is inserted braces. Transverse V-wing 5°. The fuselage is inlaid design of rectangular cross section. In the bow is the power frame for mounting the motor and a compartment for the reservoir. Stringers and bracing — strips of balsa 2X2 mm.
Stabilizer and fin are rigidly attached to the fuselage. For wing mounting him glued two pin Ø 2 mm.
Model covered in coloured macalintal paper and coated with three layers of Amalita. Design may be different, but not beyond the dimensions shown in the drawing.
The plane is equipped with engine running on LPG WITH2. It has a number of advantages over internal combustion engine: the absence of strong noise, harmful exhaust gas, moreover, does not require the use of flammable substances, easy to manufacture and operate.
Especially these benefits manifest themselves at the motors with a displacement in tenths of a cubic centimeter.
Figure 2 shows the engine in section, consisting of crankcase, crankshaft, connecting rod, piston and inlet valve.
Fig. 1. Model engine WITH2.
Fig. 2. Diagram of engine that runs on CO2:
1 — o-ring 2 — pin 3 — nut, 4 — Carter, 5 — crankshaft, 6 — rod, 7 — piston, 8 — exhaust window, 9 — intake valve 10 — piping, 11 — brass cover, 12 — gasket 13 — tank 14 — filling nozzle.
Fig. 3. The filling device engine:
1 — body, 2 — container for aerating the water, 3 — clamping nut, 4 — handle, 5 — needle perforations, 6 — ball, 7 — nut, 8 — strip.
Expanding CO2 moves the piston down, the valve closes and the gas escapes into the atmosphere through the exhaust window. The inertia of the piston passes bottom dead center and opens the intake valve and the cycle repeats.
Carter, piston, connecting rod, casing and gas inlet valves is made of aluminum alloy D16T, liner and crankshaft — steel, pipelines Ø 1-1,5 mm of stainless steel. The screw diameter of 140 mm and 110 mm made of basswood.
For filling the reservoir and perforations cartridges with CO2 (for aerating the water) uses a special device, the principle of operation is the same as in conventional siphons. The fixture consists of a housing made of aluminum alloy D16T, clamping nut, needle perforation and cap nut, which is a sealant strip.
The order of the process of filling the tank: filling nozzle is inserted into the hole of the cap nut, presses the ball and the gas canister goes into a reservoir.
Refill lasts almost half a minute, it is enough for 45 operation of the engine. One spray from siphon enough for 3-4 complete refills of the reservoir with a volume of 6 cm3.
The total duration of the flight model is well adjusted to 2.5—3 minutes.
Technical data:
Displacement, cm3 — 0 1
Piston diameter, mm — 5
Piston stroke, mm — 5,5
Maximum rpm, rpm — 2350
The weight of the model, g — 65 – 70
The weight of the engine, g — 23
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