CONTENTS #9 (September) 2019
Development and Diversification of the Subsonic Airplane’s Technologies of the Integrated Scheme with the Triangular Wing. Part 1
(p. 3 – 11)
A.V. Bondarev, S.S. Vasin, V.G. Kagan, S.A. Kuzin, V.F. Samokhin, E.B. Skvortsov, O.V. Sonin, M.N. Chanov
The conception of the multipurpose subsonic airplane of the integrated scheme with the triangular wing proved the best solution of a number of modern tasks. Technologies which lie in a basis of this conception allow to expand a range of functional features, such as increasing of subsonic flight speed, reducing of influence on environment etc. The developed technologies allow to reach fundamentally higher level of consumer properties in civil airplanes projects of the future.
Keywords: diversification of technologies; integrated scheme; triangular wing.
Evaluation of the Effectiveness of the Additive Laser Sintering Technology in the Production of Aerodynamic Models for Testing in Wind Tunnels (p. 12 – 19)
V.V. Zinyaev, S.M. Balashov
The application of modern additive technologies in the manufacture of typical elements of aerodynamic models of metal materials is considered. The analysis of the feasibility of using additive manufacturing to produce parts of various degrees of complexity. A comparison of the complexity and cost of manufacturing parts manufactured by additive technology and manufactured by machining on CNC equipment. The choice of steel powder material of PH1 type for laser sintering technology is justified. Recommendations on the rational placement of parts on the construction platform to ensure the required quality and accuracy are given.
Keywords: additive manufacturing; the technology of laser sintering of metal powders; the technology of direct laser cladding; aerodynamic model; the complexity of manufacturing parts; rational layout of parts on the platform.
Assessment of Opportunities of Projects of Carrier Rockets of an Extralight Class for Formation of Satellite Groups (p. 20 – 27)
P.A. Kozedra, Yu.A. Matveev, A.A. Pozin, Yu.V. Chikacheva, V.M. Shershakov
Number of models of some technical and economic characteristics of the carrier rockets taking into account features of their creation, modernization methods is used. The assessment of opportunities of creation of RN of an extralight class on the basis of the research meteorological MN-300 rocket for formation of the orbital groups of the small spacecrafts is carried out.
Keywords: carrier rocket of an extralight class; small spacecraft; means of start; orbital group.
Is a «Flight on a Propeller» Possible? (p. 28 – 35)
The possibility of flying an aircraft called the “vintolet”, proposed by the inventor, D.S. Khmel, is considered. A mathematical model of an aircraft of this type is described, and it is shown that the flight performance declared by the author cannot be obtained with the given parameters.
Keywords: aircraft; vertical takeoff and landing; propeller with cyclic pitch; limiting flight performance.
Experimental Studies of the Soft Slit Wing (p. 36 – 57)
The paper proposes a method of experimental study soft hollow wings, which makes it possible to obtain data on the features of shaping and aerodynamic characteristics of the wing profile, including taking into account its deformation under the action of the sling system. This data allows obtaining the basic characteristics of the designed aircraft with a similar wing, using simple engineering calculations.
According to the proposed method, experiments were carried out and comparative data on the aerodynamic characteristics of the wing with blowing from its cavity to its upper surface through a profiled slit was obtained, indicating the possibility of using it significantly increase the load-bearing characteristics of the wing and as a consequence to increase the load on its area while maintaining acceptable landing characteristics of aircraft with a soft wing.
The experiment revealed the ability of the wing at certain design parameters at negative angles of attack to crumple own the leading edge, increasing the curvature of its midline (and thus maintaining a positive lift on the front of the wing), increasing the resistance and turning the air intake on the flow, which eliminates rotation the leading edge of the wing. The obtained effect gives a reason to believe the profile with programmable crumpling of the leading-edge can ensure the absence of a twist of the leading edge of the soft wing even at negative angles of attack, increasing its safety.
Keywords: paraglider; gliding parachute; soft wing; wing bearing capacity.