High-speed cord model of class A-1. Drawing, description

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High-speed cord model of class A-1. Tips for a modeller

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High-speed cord models are especially popular among ship modellers of the USSR. According to the classification of ship and vessel models, they are combined into group A-B and are divided into four classes: A-1 - high-speed cord model of a free design with an internal combustion engine with a working volume of up to 2,5 cm3, with a propeller; class A-2 - high-speed cord model of a free design with an internal combustion engine with a volume of up to 5,0 cm3, with a propeller; A-3 - high-speed cord model of a free design with an internal combustion engine with a volume of up to 10,0 cm3, with a propeller; V-1 - high-speed cord model of a free design with an internal combustion engine up to 1,5 cm3, with a propeller.

In the process of development of high-speed cord models, their design schemes have undergone a number of changes, and now they are built according to one generally accepted scheme.

Modern class A models with hulls are called "three-point" planing systems with two floats located in the front part and a propeller set back. This scheme allows the model to dynamically slide on the heel of the outer float.

The conditions of the competition impose rather strict requirements on the design of the model. Firstly, according to the rules, the noise level of the model should not exceed 80 dB, and the noise is measured at a distance of 15 m from the model. Because of this, it is necessary to introduce special devices into the design that counteract the spread of noise from a running engine. These include ICE exhaust mufflers, hood-like screens, and soft engine mounts.

When designing and manufacturing a high-speed model, it is necessary to take into account the type of engine. For class A-1 models, you can use the Rossi 15 internal combustion engine, as well as domestic-made engines Talka-2,5, TsSTKAM-2,5 KR and TsSTKAM-2,5 KR AS. However, it should be remembered that the specific operation of engines on class A-1 models forces a number of significant changes to be made to serial engines.

The most suitable engine for use in A-1 class is the TsSTKAM-2,5 KR AS engine - the only micromotor in the world with a working volume of 2,5 cm3, in which the shaft and exhaust hole lie in the same plane, as a result, it is most easily assembled narrow, with a small midship section, the hull of high-speed cord ship models. Reconstruction of engines "Rossi-15", "Talka-2,5" and "TsSTKAM-2,5 KR" is more complicated - one cannot do without high-quality machine equipment and certain professional skills.

The body is made of balsa, plywood and linden and covered with fiberglass 0,03 mm thick using K-153 epoxy compound. Then primed with AK-20 glue and, after appropriate preparation of the surface, coated with epoxy paint.

The undercarriage of the model includes an internal combustion engine with a flywheel, driveline elements, intermediate and propeller shafts and a bracket. The flywheel is made of brass, the cardan gear elements are made of steel St. 45 or 30HGSA, heat-treated wire made of St. material is used as an intermediate shaft. 65G Ø 2,5- 3 mm. The propeller shaft is made from St. 65, the bracket is made of D16T material. Bronze bushings are pressed into it on both sides.

A-1 class high-speed cord model: 1 - float, 2 - hood, 3 - engine, 4 - resonant pipe, 5 - body, 6 - silicone tube, 7 - rubber rings, 8 - muffler, 9 - driveline elements, 10 - propeller shaft, 11 - propeller shaft bracket, 12 - intermediate shaft, 13 - stabilizer, 14 - fixing screw, 15 - traverse, 16 - fuel tank, 17 - float planing heel spring, 18 - rod guide bushings, 19 - float rods , 20 - planing float heel, 21 - linden, 22 - balsa, 23 - plywood, 24 - soft engine mount, 25 - internal combustion engine power tube, 26 - fuel tank body, 27 - fuel tank drain tube, 28 - air outlet tube, 29 - muffler insert.

Balsa floats are fixed on duralumin traverses with M2,5 screws. Guide bushings are glued into the floats for installing planing heel rods. The rods are fixed with springs made of steel St. 65G Ø 1,5 mm.

The fuel tank is soldered from tinned sheet 0,2-0,3 mm thick. Three tubes are soldered into it: the power supply of the internal combustion engine, the drainage pipe and the air outlet pipe when the tank is filled. The latter is filled through the drainage tube. During engine start and sea trials, the air outlet tube is blocked. To avoid fuel pricing during sea trials, the tank is equipped with two rubber shock absorbers.

The muffler and its insert are made of aluminum alloys. The muffler is connected to the resonant pipe using a silicone tube and is suspended in the housing on rubber rings.

You need to have several propellers. Their parameters: pitch -130-150 mm, Ø 40-44 mm, maximum blade width - 9 mm. The best material for the manufacture of such a mover is steel 65G.

Cord and bridle are made of wire St. 65G Ø 0,5 mm. The requirements for the cord, bridle and water area for launching the model can be found in the "Rules of competitions in ship modeling sports", in "Additions and changes to the rules of competitions in ship modeling sports" (M., 1977, part I and M., 1979, p. .4-5).

Starting the A-1 requires some practice, and if your first attempts to "revive" the engine are unsuccessful, then it's in the adjustment, and this skill comes with practice, with hard training on the water.

After mastering the launch skill, you can start setting up the A-1 in dynamic mode. Its purpose is to create such conditions for the movement of the model, under which the hydrodynamic resistance will be minimal, and the device will go smoothly, without jumps. In this case, the efficiency of the propeller and, accordingly, the speed will be maximum.

Adjustment of the model is carried out by changing the angles of installation of the stabilizer and bracket. The final stage of tuning is the adjustment of the power system and the selection of propellers. The movement of a single-chamber tank in the transverse direction of the apparatus affects the mode of operation of the engine. When it moves from the center of the circle, the tank "poor", and vice versa - "rich".

The design speed of the recommended model is 170-175 km/h.

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