Results 21 to 30 of about 387,967 (213)
Sensitivity of tail rotor noise to helicopter configuration in forward flight [PDF]
, 2009 Understanding the mechanisms that lead to the production of noise by tail rotors across a broad range of flight conditions and helicopter configurations remains an active area of research.
Fletcher, Timothy M. +2 more
core +4 more sources
Experimental research of single - rotor helicopter unintentional yaw rotation
Научный вестник МГТУ ГА, 2020 Aviation accidents related to unintentional rotation may periodically occur while flying single-rotor helicopters. On-time and correct actions may help the pilot to find the way out of this hazardous situation.
V. V. Efimov +3 more
doaj +1 more source
Ground effect on a rotor wake. [PDF]
, 1985 The effect of the ground on a rotor wake in forward flight has been investigated experimentally in the working section of an 8ft x Oft straight-through wind tunnel.
Kusmarwanto, I.
core +6 more sources
The influence of helicopter tail rotor parameters on RCS
Hangkong gongcheng jinzhanHigh requirements have been placed on the stealth performance of armed helicopters during wartime missions，in order to reduce the probability of the helicopter being found during the task，based on geometric optics method and consistent diffraction theory，
ZHAO Qijun
doaj +1 more source
Machines, 2022 Vertical take-off and landing (VTOL) aircraft have become important aerial vehicles for various sectors, such as security, health, and commercial sectors.
Emmanuel Alejandro Islas-Narvaez +4 more
doaj +1 more source
Helicopter tail rotor orthogonal blade vortex interaction [PDF]
, 2004 The aerodynamic operating environment of the helicopter is particularly complex and, to some extent, dominated by the vortices trailed from the main and tail rotors. These vortices not only determine the form of the induced flow field but also interact
Marshall, J.S. +7 more
core +1 more source
Известия высших учебных заведений России: РадиоэлектроникаIntroduction. The most common helicopters are those based on a single rotor design, each with a main rotor and a tail rotor. Radar images of helicopter rotors, combined with their rotational speeds, contain information that allows the helicopter type to ...
Sergey R. Heister, Valery V. Kirichenko
doaj +1 more source
Preliminary design of small distributed ducted electric tail rotor helicopter
Hangkong gongcheng jinzhanTo address the issues of complex transmission structure, low fault tolerance, and poor safety in traditional single-rotor helicopters with tail rotors(such as high accident rates due to tail rotor transmission system failures and collisions easily ...
LIU Chaofan +2 more
doaj +1 more source
Protocol for quantifying miRNA trafficking across the endosomal membrane
FEBS Open Bio, EarlyView.An in vitro protocol measures miRNA uptake into endosomes isolated from mammalian cell extracts, which are free of subcellular contaminants. Performed at 37 °C in the presence of ATP, it ensures the import of single‐stranded miRNA into the endosomal lumen.
Syamantak Ghosh +2 more
wiley +1 more source
Xibei Gongye Daxue XuebaoDue to the influence of slip flow and wake, the tail rotor of a helicopter may produce strong unsteady aerodynamic force in its main rotor interference flow field, which may affect the helicopter control and lead to structural failure.
WEN Long +6 more
doaj +1 more source