Helicopter low-speed yaw control [PDF]
, 1993 A system for improving yaw control at low speeds consists of one strake placed on the upper portion of the fuselage facing the retreating rotor blade and another strake placed on the lower portion of the fuselage facing the advancing rotor blade.
Crowell, Cynthia A. +2 more
core +1 more source
Operational and research aspects of a radio-controlled model flight test program [PDF]
The operational and research aspects of a subscale, radio-controlled model flight test program are presented. By using low-cost free-flying models, an approach was developed for obtaining research-quality vehicle performance and aerodynamic information ...
Budd, Gerald D. +2 more
core +1 more source
Acoustic mode measurements in the inlet of a model turbofan using a continuously rotating rake: Data collection/analysis techniques [PDF]
The rotating microphone measurement technique and data analysis procedures are documented which are used to determine circumferential and radial acoustic mode content in the inlet of the Advanced Ducted Propeller (ADP) model.
Hall, David G. +2 more
core +1 more source
Short-Term Use Biocontainment Bubbles: Innovative Source Containment of Potentially Infectious SARS-CoV-2 Aerosols. [PDF]
Appl Biosaf, 2022 Fontes B +3 more
europepmc +1 more source
Acoustic Mode Measurements in the Inlet of a Model Turbofan Using a Continuously Rotating Rake [PDF]
Comprehensive measurements of the spinning acoustic mode structure in the inlet of the Advanced Ducted Propeller (ADP) have been completed. These measurements were taken using a unique and previously untried method which was first proposed by T.G. Sofrin.
Hall, David G., Heidelberg, Laurence J.
core +1 more source
Investigation of advanced counterrotation blade configuration concepts for high speed turboprop systems. Task 5: Unsteady counterrotation ducted propfan analysis. Computer program user's manual [PDF]
The primary objective of this study was the development of a time-marching three-dimensional Euler/Navier-Stokes aerodynamic analysis to predict steady and unsteady compressible transonic flows about ducted and unducted propfan propulsion systems ...
Adamczyk, John J. +5 more
core +1 more source
Modeling and Robust Tracking Decoupling Control of a Coaxial Unmanned Helicopter Based on the Improved Alternating Direction Method of Multipliers. [PDF]
Comput Intell Neurosci, 2022 Xu A, Wang F, Chen M.
europepmc +1 more source
Investigation of advanced counterrotation blade configuration concepts for high speed turboprop systems. Task 5: Unsteady counterrotation ducted propfan analysis [PDF]
The primary objective of this study was the development of a time-marching three-dimensional Euler/Navier-Stokes aerodynamic analysis to predict steady and unsteady compressible transonic flows about ducted and unducted propfan propulsion systems ...
Delaney, Robert A., Hall, Edward J.
core +1 more source
Aeroacoustics and psychoacoustics characterization of a boundary layer ingesting ducted fan. [PDF]
NPJ AcoustAhmed F +3 more
europepmc +1 more source
The Potential Benefits of Advanced Casing Treatment for Noise Attenuation in Utra-High Bypass Ratio Turbofan Engines [PDF]
In order to increase stall margin in a high-bypass ratio turbofan engine, an advanced casing treatment was developed that extracted a small amount of flow from the casing behind the fan and injected it back in front of the fan.
Elliott, David
core +1 more source