Results 141 to 150 of about 189,174 (279)
Psychoacoustic Test to Determine Sound Quality Metric Indicators of Rotorcraft Noise Annoyance [PDF]
Noise certification metrics such as Effective Perceived Noise Level and Sound Exposure Level are used to ensure that helicopters meet regulations, but these metrics may not be good indicators of annoyance since noise complaints against helicopters ...
Christian, Andrew +2 more
core +1 more source
Helicopter anti-torque system using fuselage strakes [PDF]
, 1987 The improvement of the helicopter torque control system is discussed. At low to medium forward speeds helicopter performance is limited by the effectiveness of the means for counteracting main rotor torque and controlling sideslip airloads.
Kelley, Henry L., Wilson, John C.
core +1 more source
State Integration and Violence at the Margins: The Logic of Police Raids in Rio de Janeiro's Favelas
The Howard Journal of Crime and Justice, EarlyView.ABSTRACT This paper investigates police raids in Rio de Janeiro's favelas through a property rights framework, exploring their organisational structure, motivations and implications. Using data from police reports, academic studies, NGOs and news sources, it examines why and how the state intervenes in these contested spaces.
Joseph Bouchard
wiley +1 more source
Helicopter simulation: Making it work [PDF]
The opportunities for improved training and checking by using helicopter simulators are greater than they are for airplane pilot training. Simulators permit the safe creation of training environments that are conducive to the development of pilot ...
Payne, Barry
core +1 more source
CHANCE: A FRENCH-GERMAN HELICOPTER CFD-PROJECT [PDF]
, 2006 The paper gives an overview of the CHANCE research project (partly supported by the French DPAC and DGA and the German BMWA) which was started in 1998 between the German and French Aerospace Research Centres DLR and ONERA, the University of Stuttgart and
Altmikus, Andree +4 more
core
Alloparenting the investment child: A reply to responses
The British Journal of Sociology, EarlyView.
Nina Bandelj
wiley +1 more source
Evaluation of drone system for thinning operations–a case study in Sweden
International Transactions in Operational Research, EarlyView.Abstract Thinning operations in forestry typically involve a two‐machine system (TMS) with a harvester and a forwarder. Its productivity in different forest conditions is well documented. To date, drones have been used for data collection and surveillance but not as an alternative to a TMS.
Mikael Rönnqvist +3 more
wiley +1 more source
A mathematical model of the UH-60 helicopter [PDF]
This report documents the revisions made to a ten-degree-of-freedom, full-flight envelope, generic helicopter mathematical model to represent the UH-60 helicopter accurately.
Hilbert, K. B.
core +1 more source
Rotorcraft research testing in the National Full-Scale Aerodynamics Complex at NASA Ames Research Center [PDF]
The unique capabilities of the National Full-Scale Aerodynamics Complex (NFAC) for testing rotorcraft systems are described. The test facilities include the 40- by 80-Foot Wind Tunnel, the 80- by 120-Foot Wind Tunnel, and the Outdoor Aerodynamic Research
Johnson, W., Smith, C. A., Warmbrodt, W.
core +1 more source