This paper examines the possibility of using photoelectric energy conversion during creation of electric unmanned aerial vehicles of a hybrid type. These vehicles should operate at altitudes up to 22,000 m and have an unregulated flight time. The problems arising during creation of such devices are their instability and poor controllability. Also they possess a number of disadvantages typical for airships: large size and, as a consequence, high windage and dependence on weather conditions; low maneuverability and, as a consequence, the difficulty of landing. These negative aspects of all circular wings resulted in complete rejection of their development. However, the considered disadvantages show the feasibility of creating hybrid aircraft. Particular attention in this paper is given to disk-shaped vehicles. They have less windage, do not need to turn around when changing the direction of flight. The presence of solar panels in combination with modern control and navigation systems make it possible to create new unmanned aerial vehicles with unlimited flight time. The aircraft dimensions are calculated as a function of the lifted mass and other parameters. Recommendations on possible operation parameters of hybrid airship are given.

In this paper high-speed electric motors are considered, allowing one to obtain the necessary weight and dimensions for modern equipment. The creation of high-speed machines is directly related to the study of factors limiting their range of rotational speeds with the choice of electrical steel with lower specific losses and sheets of smaller thickness and modeling the magnetic field in the magnetic system of the machine.

This article considers small-size electric machines used in various fields of technology, from medical electrical equipment to complex mechatronic systems as part of spacecraft. To obtain satisfactory weight and size parameters of electric machines, it is necessary to take into account many factors that limit the possibility of reduction the machine size. The high energy of modern permanent magnets (250 - 300 kJ/m3) makes it possible to obtain the best weight and dimensons indicators in the designs of brushless direct current machines with excitation from permanent magnets, taking into account the influence of thermal processes.

The article discusses promising designs of high-speed electric motors for autonomous medical instruments. These machines ensure the creation of an autonomous electromechanical tool with low energy consumption, which predetermines the possibility of its use in field conditions. On the other hand, higher ergonomic indicators contribute to better performance of operations.

The article discusses the historical aspects of church singing, as well as church singing practice related to the activities of the Orthodox Church in Russia. It is shown that this practice has become a part of the global musical culture and a solid foundation of the national performing choir school. The activities of the great regents of the past-V. Orlov, A. Kastalsky, N. Danilin, P. Chesnokov, M. Klimov, A. Arkhangelsky and many others received worldwide recognition and gave a powerful impetus to the development of choral art. Particular attention is paid to the church singing practice, which today is a collection of regional regent practices that are relatively autonomous and often different among themselves. Therefore, it is most expedient to study them separately, taking into account the contextual peculiarities of a particular region. So, for example, the Voronezh region is a region in which different types of cultures coexist. Naturally, this fact creates a special situation in their interaction, including in the sphere of religious consciousness. The existence of multi-confessional church choirs "at the junction" of national cultures is extremely important in the context of the problems of modern society-the crisis of culture, spiritual relativism, aggressive propaganda of pseudo-religious sects, outbreaks of nationalism. Such a dialogue will be useful for the formation of tolerance, mutual understanding and understanding of the values of different cultures.