The first article presents the results of the study of blade guide devices radial turbines, differing in the shape of the profiles, the angle of installation, the value of the relative pitch and the thickness of the output edges of the blades of nozzles. Experimental data on the influence of changes in these factors on the course of the characteristics of the stage. The second article is devoted to poorly studied issues of construction, calculation and optimal installation of axial motor fans of the liquid cooling system of internal combustion engines . It describes the method of testing fans, adopted by us, as well as the results of a series of serial and experienced fans in the optimal conditions of their installation. As a result, the optimal parameters of car fans and the conditions for their installation were identified, as well as the dependencies necessary for their calculation. were determined. In the third article, the influence of increased carbon content on the mechanical properties, heat resistance and heat resistance of the alloys ANV-300 and EI437 . is considered. Bv litom variant[DT ] [ The phase composition of the alloys ANV-300 and ANV-300 with carbon has been studied, the redistribution of the alloying elements between the phases as a result of the introduction of the carbon alloy and its modifying effect has been considered. As a result, it has been shown that: