CONTENTS #3 (March) 2020
High-Speed Single-Rotor Helicoptere (p. 3 – 15)
N.S. Pavlenko, A.I. Shomov
The results of flight tests of the new-generation main rotor on the technology demonstrator show that the classic single-rotor helicopter has fundamentally new capabilities with hinged blades.
The possibility of horizontal flight with a maximum speed of 400...420 km/h and at a cruising speed of 350...370 km/h without additional propulsive thrusters at low vibration levels without using special means of vibration cancellation is shown. At the same time, the loads in the control system and on the units of the carrier system allow you to get high values of their resources.
According to the totality of the results obtained, the flying laboratory surpasses all civil, military domestic and foreign helicopters.
Keywords: rotary wing aircraft; flight characteristics; combat effectiveness.
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Synthesis of the Experimental Researching Results for the Hydrogen Liquid Rocket Engine Chill Down and Starting Processes (p. 16 – 24)
V.P. Firsov, А.G. Galeev, I.V. Antyukhov
The results of the experimental data generalization on the cryogenic tubes cooling processes and the start of the oxygen-hydrogen engine are presents. The generalizing dependences on heat transfer, hydrodynamics of flow parameters in supply systems at various flow regimes of nitrogen and hydrogen two-phase flows are considers.
Keywords: cooling; propulsion line; flow part processes; experimental procedure; oxygen-hydrogen engine start-up.
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Local Вuckling Particular Qualities of Three-Layers Composites with Discrete Filler’s Structure
(p. 25 – 29)
A.A. Zotov, O.S. Dolgov, A.M. Kolpakov, A.N. Volkov
The itemised investigation report of carrying three-layers composites with unconventional discrete filler’s structure during bending and buckling used in aircraft industry is shown. As well, the algorithm of lightweight and strength optimization for corresponding fillers with advantages over honeycomb and plicated ones is represented.
Keywords: three-layer construction; discrete core; bending; stability; structural parameters; critical stresses; finite element method.
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Analysis of Possible Causes Aircraft Jumping up when Touching the Runway (p. 30 – 37)
Yu.B. Dubov, O.I. Tkachenko, I.M. Levitin
Possible causes of aircraft jumping up when touching the runway analyzed. Considered are factors affecting this phenomenon: c.g. position, landing gear geometry and its characteristics, control system parameters and methods of this phenomenon elimination.
Keywords: landing; jumping up; fighter.
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Assessment of the Impact of Shock Overload on a Person’s Head Using a Curve that is Constructed in Coordinates «The Velocity Lost Upon Impact – Speed of the Overload Acceleration» (p. 38 – 44)
E.A. Seleznev
Analyzes the materials of pervious tests, in which the Head Injury Criterion is used to determine the safe head contact from an adverse impact factor. A method is proposed for assessing head injury safety using a curve constructed in coordinates «the velocity lost upon impact ΔV – speed of the overload acceleration \(\dot{n}\)»
Keywords: test; safety; Head Injury Criterion; energy absorbing seat.
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Evaluation Capabilities the Pilot to Eliminate Abnormal Condition of Helicopter (p. 45 – 49)
S.I. Demyanenko, G.P. Shibanov
Discussed are methodical ways to the evaluation capabilities the pilot to eliminate abnormal condition helicopter with minimum damage for helicopter and crew members.
Keywords: helicopter; abnormal condition; evaluation capabilities the pilot; helicopter going out abnormal condition.
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Design of Gliding Parachute Systems. Formation of the Parachute’s Shape (p. 50 – 56)
P.I. Ivanov
The paper presents some results of the theoretical part of the design process planning a parachute concentrating theoretical, engineering and experimental data and knowledge on the shaping of gliding parachutes based on several papers and guidelines of the author.
Keywords: design; planning parachute systems; formation of the shape of the planning parachute.
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