EXPERIMENTAL RESEARCH OF FLAPPING FLIGHT, NOT EXPLORED PHENOMENON IN AERODYNAMICS AND THE QUESTION OF FLYING SAUCER EFFICIENCY http://sci-article.ru/stat.php?i=1601957819 Kandyba Pavel Yurievich Annotation: As a result of experiments with the motion of asymmetrically oscillating bodies in a viscous medium, it was found that the generally accepted idea of such a principle of motion is not correct. A description of the experiments and the observed effect is given, as well as its interpretation. Abstract: As a result of experiments with the motion of asmmetscillating bodies in a viscous medium, it was found that the generally accepted idea of such a principle of motion is not correct. A description of the experiments and the observed effect is given, as well as its interpretation. Keywords: aerodynamics; hydrodynamics; turbulence; vortex; experiment; flapping flight, vibrating flight, flying saucer UDC 533.664 Introduction The purpose of this article is to draw attention to a little-studied phenomenon in the field of aerodynamics, a more detailed study of which, in the author's opinion, will give a significant impetus to the development of the aerospace field. Now 4 basic principles of engines are used: screw; reactive; using air currents as a driving force; using light gas. All of these principles have their advantages and disadvantages, and their combination often leads to a decrease in overall performance. New types of engines, the principles of which are based on theoretical research, have not been found, and their searches have created a lot of pseudoscientific ideas. And at the same time in nature there is the most perfect form of flight, which man has not mastered to the end. This is a flapping flight, which, as the reader will be convinced, is a synthesis of the above flight methods. Relevance To date, research is underway in different countries of the world with the aim of using the principle of flapping flight for practical purposes. There are some robotic models that have flapping wings, but they are inferior in efficiency to classical aircraft. Their resource is significantly limited by the complexity of the design, which does not allow them to realize high power. Nevertheless, for many years there has been a technical solution to this issue that has remained on paper - vibrating flight. Goals and objectives The author carried out experimental work, the purpose of which was to study the method of motion in a homogeneous medium by means of asymmetric oscillations. He created mock-ups of aircraft with vibrating wings, and carried out a series of tests in which their characteristics were investigated. The author found that the results of his experiments did not correspond to the generally accepted scientific theory of the motion of such devices. Classic description of the principle To begin with, consider the generally accepted theories of motion in a viscous medium of asymmetrically vibrating bodies. The most famous of them is the explanation of the principle of motion of an inertion propulsion drive in a liquid: The principle of operation of inertion propulsion drive lies in the fact that their purposeful movement is caused by the difference in the resistance force during the forward and reverse half-cycle of work. With dry friction, the resistance to slow movement exceeds the resistance to fast movement (in one half cycle, when a small force is applied, the static friction force is not overcome and the apparatus remains in place; in the reverse half cycle, the friction force is overcome, the apparatus moves). In liquids, on the contrary, resistance to fast movement prevails over resistance to slow movement. The explanation of the effect in liquids is fundamentally different (since there is no static friction force in liquids and gases) and is based on viscous friction forces. The description of the principle of movement in air, the same as the movement of an inertioid in a liquid medium, has a vibrating flight: To get an idea of the mechanism of the appearance of the thrust force, let us first consider the appearance of the thrust force when the plate moves in the same medium with different speeds of forward and reverse strokes. The thrust force in different modes of forward and reverse motion in the same medium of movement arises due to the following two effects. 1) Nonlinear dependence of the resistance of the medium to the displacement of the propeller on its speed and its derivatives - even for a symmetrically executed propeller (for example, a round plate moving along the normal). Due to the different modes of forward and reverse strokes, the average resistance force will not be zero and can reach a value sufficient for the movement. When the propeller moves in a working stroke at a speed 10 times higher than the idle speed, the efficiency of the propeller, i.e. the ratio of the energy used by the mover to the energy received by the mover can reach a value approaching 90%. 2) The asymmetry of the propulsion unit relative to the plane perpendicular to the direction of motion can lead to the fact that a tractive effort arises even when the speeds of the straight about and reverse moves. This effect - the dependence of the drag on the shape of the body and with its asymmetry on the direction of motion - is well known in aerodynamics.