To date, the problem of forest fires does not lose its relevance. New technical means are being developed to prevent and eliminate forest fires. The article describes laboratory tests of a forest fire soil-throwing machine with the function of fire-break maker. To conduct experiments on the study and analysis of the process of throwing soil with a forest fire soil-throwing machine with the function of fire-break maker, a laboratory installation was developed and manufactured with the ability to change a large number of adjustment parameters with the ability to work in the soil channel of the MF and MD laboratory. The program of experimental studies included the study of the process of throwing soil with a throwing cutter equipped with 6, 4 or 3 blades, when working together with spherical disks with a diameter of 440 mm. The experimental studies were carried out as follows. Initially, by turning on the hydraulic drive, the cutter-thrower of the experimental sample of forest fire soil-throwing machine with the function of fire-break maker was put into rotation. The speed of the cutter-thrower was 500 rpm. Then the attachment of the traction and energy trolley was put into operation, which lowered the cutter-thrower to contact with the soil. The trolley was set in motion at a constant speed of 0.28 m/s and covered a distance of 10 m in 36 to 38 s, taking into account acceleration and deceleration. The depth of the cutter-thrower was 0.15 m. At the end of the movement, it was braked and the hydraulic motor was turned off, which set the cutter-thrower in motion. The pressure characteristics of the working fluid, as well as the dynamic characteristics of the operation of the device, were taken using the strain gauge station ZetLab (ZET 058). According to the results of processing the experimental data, it was determined that it is rational to use 6 blades to equip the design of the cutter-thrower. The optimal value of the angle γ of their installation is -10º.

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Multivariate computer experiment is planned, which characterizes the process of working of site-maker for the formation of sites around the stumps. Input process criteria were divided into 4 groups: "Options of site-maker", consisting of the construction of the machine, "Kinematic parameters", describing its technical characteristics, "Parameters of the soil" and "Parameters of the stump". The research results can be used in the design and manufacture of site-makers with flexible working bodies and in their application to the felling and slash areas.