Applications of Twin Counter-Rotating Common-Axis Rotor Systems in Modern Rotorcraft and UAVs
Engineering ProceedingsThis study represents a comprehensive analysis of the implementation of twin counter-rotating common-axis (coaxial) rotor systems in the design process and technical application of rotorcraft and Unmanned Aerial Vehicles (UAVs).
Gabriel Georgiev, Vladimir Serbezov
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Analysis and Optimization of Hanging Stability of Heavy-Duty Coaxial Unmanned Helicopter
Applied SciencesThis study examines the hovering and forward-flight stability of a heavy-lift coaxial unmanned helicopter with a suspended payload. A six-degree-of-freedom dynamics model is developed, coupling the rotor, fuselage, and a rigid-body sling via a universal ...
Anan Xu +3 more
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Aerodynamic Layout Design of a Compound Conventional Rotor High-Speed Unmanned Helicopter
DronesHigh-speed capability is a defining feature of next-generation helicopters, enabling time-sensitive missions. This paper compares three high-speed configurations: tiltrotor, coaxial rigid rotor, and compound conventional rotor.
Long He +5 more
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Analysis of Flapping Motion of Rotors of Small Coaxial Helicopter
TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, 2006 We analyzed a small coaxial helicopter developed for entertainment in 2002. The upper and lower rotors are rigid rotors. The upper rotor is connected to a stabilizer bar. The cyclic pitch of the upper rotor is controlled by the stabilizer bar when the attitude of the helicopter is varied. The angle between the upper rotor and the stabilizer bar is 41°.
SUNADA, Shigeru +3 more
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Dynamic modeling and analysis of the rotor-stator coupling system of a coaxial contra-rotating gearbox. [PDF]
Sci Rep, 2023 Zhang D, Cui J, Zhu R, Li M.
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Study on Vibration Reduction Technology of Coaxial Rigid Rotor Based on High‑Order Harmonic Control
Nanjing Hangkong Hangtian Daxue XuebaoAiming at the issue of large vibration loads during high-speed forward flight of coaxial helicopters， the implementation of high-order harmonic control（HHC） on the coaxial rotors system is considered for active vibration suppression control.
WEI Wulei +3 more
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A Dynamic RCS and Noise Prediction and Reduction Method of Coaxial Tilt-Rotor Aircraft Based on Phase Modulation. [PDF]
Sensors (Basel), 2022 Wang Z, Huang J, Yi M, Lu S.
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Review of coupled rotor-fuselage dynamics design methodology for coaxial rigid rotor helicopter
Hangkong gongcheng jinzhanThe coaxial rigid rotor configuration offers compact design, high hover efficiency, and high-speed potential, but its coupled rotor-fuselage dynamics remain a key bottleneck. This paper reviews progress and challenges in three areas: theoretical modeling,
GAO Xiaodong +4 more
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FlySub Multiengine coaxial helicopter technical specification
FlySub Multiengine coaxial helicopter technical specification (in Hungarian) The helicopter is a twin-engine, two-person, twin-piloted helicopter with side-by-side seats coaxial rotor arrangement. Its basic purpose is to be capable of operating with a high degree of safety two persons and a payload of at least 250 kg or 350 kg with one pilot and 550 ...
Fodor, Dénes, FlySub Ltd.
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