High-speed cord racing model. Drawing, description

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High-speed cord racing model. Tips for a modeller

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Cord racing model 2,5 cm3 class was developed and manufactured in the auto-modeling laboratory of the Palace of Pioneers and Schoolchildren of the Pervomaisky district of Moscow under the direction of A. Pyatibratov. The model is the winner of the national championships in 1977-1978. Designed for the KMD-2,5 engine, the diameter of the driving wheels is 80 mm. With a properly adjusted and well-rolled engine, a model of this type develops a speed of about 170 km / h. Particular attention during the development was paid to the reliability of all units.

According to the established tradition, the design began with sketches of the general view and layout of the main units. Many years of experience in sea trials have shown that the most reliable in operation will be a box-type gearbox with spaced bearings, in a non-cantilever one, in which, due to the small distance between the bearings, they often fail, which disrupts the quality of the engagement. For the same reasons (reliability), the gearbox housing is made of steel 45-normalized. The case is made of two halves and has a connector on a horizontal plane. The halves are fixed with three pins Ø 2 mm and four M3 screws. Holes for bearings No. 1000 096 of the driven gear are bored in the housing.

Borings for bearings are made on a jig boring machine after assembling the halves of the gearbox housing. This operation can also be performed on the faceplate of a lathe with a rotary fixture. However, in the latter case, it is difficult to achieve exact alignment of the axes. The assembly of the gearbox and the adjustment of the gear engagement must be carried out "on the paint" under the supervision of an experienced mechanic. The gearbox after assembly and flushing has a smooth ride with minimal engagement gaps. The axial play of the complete shafts must not exceed 0,05 mm, it is also very dangerous to "clamp" the bearings.

This model uses gears made of steel 38KhMYuA, nitrided after final processing to a depth of 0,1-0,15 mm, followed by fine-tuning of seats for bearings. Number of teeth: Z1=14, Z2=27. Hardness - HRc=60.

Gearbox sprung type. The tail section is mounted in guides between two compression springs.

The rear wheels of a collapsible type are mounted on the pinion shaft using split cones. The collapsible design, in our opinion, is the most perfect, easy to manufacture, apparently, therefore, many leading modellers use it on their cords. The wheels can be mounted on the hubs, and the hubs on the shaft using a cylindrical key and M4 screws. This mounting option improves the accuracy of wheel alignment and allows for repeated assembly and disassembly of the gearbox.

High-speed cord model designed by A. Pyatibratov: 1 - front suspension, 2 - fuel tank, 3 - stopping device, 4 - engine (KMD-2,5), 5 - fairing, 6 - gearbox, 7 - shock absorber, 8 - pan, 9 - supply tube, 10 - cord strap.

Speed cord racing model
Gearbox layout

Speed cord racing model
Rear wheel disassembled

Cantilever front suspension. The wheels are non-separable, made of sheet duralumin, on which a layer of rubber 4-5 mm thick is vulcanized with the help of a leucopath. The front wheels are mounted on etu-faces, and bores are made in them for 4X9 bearings (two in each hub). Tank model - open type, made of tin 0,3-0,5 mm thick. The outlet of the supply tube from the tank coincides with the longitudinal axis.

The pallet - the lower part of the body - is made after all components and assemblies are ready. On a milling machine made of D16T, D1T or aluminum-magnesium alloy AMG-6, the pallet is milled according to preliminary marking. Particular attention should be paid to the alignment of the motor and gearbox, this will facilitate their assembly and alignment. It is also desirable to install an intermediate cardan shaft between the flywheel and the gear, and the distance between the studs can be only 12-15 mm.

The fairing of the model is glued from fiberglass with a thickness of 0,3-0,5 mm with epoxy resin on a blank, struts made of aircraft plywood are placed inside. The fairing is painted after processing with nitro paint and varnished. The lower part of the case is sanded and polished with GOI paste.

Author: A.Pyatibratov

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