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Vibratory ice protection for helicopter rotor blades
First published in 1978...
View Book →Vibration Reduction of Helicopter Blade Using Variable Dampers
First published in 2018...
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Aircraft accident report
First published in 1975...
View Book →Periodic control of the individual-blade-control helicopter rotor
First published in 1984...
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NASA Technical Reports Server (NTRS) 19930085269: Wind-tunnel Tests of a Full-scale Helicopter Rotor
Available on Internet Archive....
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DTIC ADA1035356: Design of a Slot Height Distribution for Increased Hover Control Power on a Circula
The Circulation Control Rotor Performance Prediction computer program was used with the XH-2/CCR rotor configuration to determine a slot height distribution that would improve control power in hover w...
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DTIC ADA508845: Revolutionary Physics-Based Design Tools for Quiet Helicopters, Phase I-B Extension
A computational research program was performed at Georgia Institute of Technology, Penn State University, and at Northern Arizona University to develop a set of first-principles based computational mo...
View Book →Correlation of Airloads on a Two-Bladed Helicopter Rotor
First published in 2018...
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DTIC ADA099192: Preliminary Design of a Tip-Jet-Driven Heavy Lift Helicopter Incorporating Circulati
This report describes a preliminary design study for a Very Heavy Lift Helicopter (VHLH) that is powered by jets at the blade tips and is controlled by circulation control applied to the main rotor bl...
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DTIC AD0724192: Flight Evaluation of Elastomeric Bearings in an AH-1 Helicopter Main Rotor
Presented in this report are the results of a flight test program conducted to evaluate elastomeric bearings in the main rotor of an AH-1G helicopter. An experimental main rotor was fabricated and tes...
View Book →Performance optimization of helicopter rotor blades
First published in 1991...
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DTIC ADA640406: Analysis of Rotor Forces in a Ship Airwake
This paper examines the helicopter/ship dynamic interface by combining both experimental and numerical analyses. The flow field over the flight deck of a frigate model was mapped experimentally in a w...
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NASA Technical Reports Server (NTRS) 19980228027: A Wind-Tunnel Investigation of Rotor Behavior Unde
A wind-tunnel investigation was made to study the behavior of a model helicopter rotor under extreme operating conditions. A 1/8-scale model of the front rotor of a tandem helicopter was built and tes...
View Book →Helicopter main rotor blade ballistic damage tolerance
First published in 1979...
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DTIC AD0750179: A Theoretical Analysis of the Tip Relief Effect on Helicopter Rotor Performance
A theoretical method is derived whereby the effect of the compressible three-dimensional relief on the torque required for a helicopter rotor may be calculated. The complementary wing approach is used...
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Migrating SQL Server Databases to Azure
Microsoft Azure Essentials...
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DTIC ADA200255: Development of a Panel Method for Modeling Configurations with Unsteady Component Mo
This report reviews the background to the calculation of unsteady rotor and fuselage loads and presents results from an analysis of a typical helicopter configuration made using a panel method operate...
View Book →Fully integrated aerodynamic/dynamic optimization of helicopter rotor blades
First published in 1992...
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DTIC ADA1016035: MM&T - Low Cost Production/Installation of Urethane Leading Edge Guards on Rotor Bl
This program to develop a process for a low-cost production/installation of urethane leading edge guards for rotor blades was to consist of three tasks as follows: Task I - Manufacturing Process Ident...
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Introducing Microsoft SQL Server 2016
Mission-Critical Applications, Deeper Insights, Hyperscale Cloud...
View Book →Hazards of rotating propeller and helicopter rotor blades
First published in 1983...
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DTIC AD0775857: Inclusion of Tip Relief in the Prediction of Compressibility Effects on Helicopter R
The tip relief effect on the performance of helicopters operating at high subsonic tip Mach numbers is calculated. The theoretical method based on the complementary wing model for tip relief is applie...
View Book →Helicopter blade vibration and flutter
First published in 1956...
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DTIC ADA329229: Test Results of the RAH-66 Main Rotor Ballistically Damaged Flexbeam.
The AATD supplied, ballistically damaged, RAH-66 main rotor blade flexbeam was tested in fatigue to demonstrate fly home capability. The testing was conducted in the Bearingless Main Rotor test facili...
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Fundamentals of Azure
Microsoft Azure Essentials...
View Book →Helicopter rotor blade design for minimum vibration
First published in 1984...
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DTIC ADA523729: Rotor Airloads Prediction Using Loose Aerodynamic/Structural Coupling
This work couples a computational fluid dynamics (CFD) code and rotorcraft computational structural dynamics (CSD) code to calculate helicopter rotor airloads across a range of flight conditions. An i...
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DTIC AD0662259: STABILITY AND CONTROL HANDBOOK FOR HELICOPTERS
Analytical methods are presented for determining the dynamic stability and control characteristics of generalized procedures which are considerably simplified through the extensive use of information ...
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DTIC AD0875744: A Wind-Tunnel Investigation of the Aerodynamic Environment of a Full Scale Helicopte
Aerodynamic data were measured at one blade radius station as the initial phase of a program designed to define the aerodynamic environment over the entire rotor disc. The rotor was instrumented to me...
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DTIC AD1015586: Helicopter Non-Unique Trim Strategies for Blade-Vortex Interaction (BVI) Noise Reduc
An acoustics parametric analysis of the effect of fuselage drag and pitching moment on the Blade-Vortex Interaction (BVI) noise radiated by a medium lift helicopter (S-70/UH-60) in a descending flight...
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Integrated Aerodynamic/Dynamic Optimization of Helicopter Rotor Blades
First published in 2018...
View Book →Blade Planform for a Quiet Helicopter
First published in 2018...
View Book →Helicopter tail rotor blade-vortex interaction noise
First published in 1989...
View Book →Helicopter blade-vortex interaction noise with comparisons to CFD calculations
First published in 1996...
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DTIC ADA131733: Application of the Small Body Pressure Transducer
The small body pressure transducers were used in both fixed-wing and rotary-wing scale models to measure dynamic and static pressures. These models were then tested under controlled wind tunnel condit...
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DTIC ADA031133: 'Product Improvement Test of UH-1 Main Rotor Blades with Erosion-Resistant Leading-E
The coated blade operated 16.2 hours prior to being flown in rain. Visual inspection revealed no deterioration. After 1.5 operating hours in heavy rain (to a total operating time of 17.7 hours), the c...
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DTIC ADA209804: Analysis of a System to Prevent Helicopter Rotor Blade-Airframe Strikes
Rotor blade-airframe strikes are rare but they do occur. Three areas of the airframe are particularly vulnerable: the tail boom, canopy and, in the case of the underslung, teetoring rotor, the rotor s...
View Book →Helicopter blade-vortex interaction locations
First published in 1987...
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DTIC ADA115003: Dynamic System Coupling (DYSCO) Program. Volume I. User's Manual.
Dynamic System Coupling (DYSCO) is a computer program which allows an interactive user to couple arbitrary components and force algorithms into a model of a helicopter or other dynamic system. The equ...
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MARE-WINT
New Materials and Reliability in Offshore Wind Turbine Technology...
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