Survey of Army/NASA rotorcraft aeroelastic stability research [PDF]
Theoretical and experimental developments in the aeroelastic and aeromechanical stability of helicopters and tilt-rotor aircraft are addressed. Included are the underlying nonlinear structural mechanics of slender rotating beams, necessary for accurate ...
Hodges, Dewey H. +3 more
core +1 more source
Tradeoff analysis of technology needs for public service helicopters [PDF]
The design requirements for a family or type of Public Service Helicopter (PSH) is examined which will satisfy the needs of municipal and state governments in the following mission areas: Emergency Medical Service--Airborne Rescue Squad; Law Enforcement;
Bauchspies, J. S. +2 more
core +1 more source
Open airscrew VTOL concepts [PDF]
The following concepts, based on using open airscrew(s) for VTOL maneuvers, are re-examined in light of current technology: (1) tip-driven helicopters, (2) compound helicopters; and (3) high-speed VTOL aircraft, represented by tiltrotors, tiltwings ...
Stepniewski, W. Z., Tarczynski, T.
core +1 more source
Research at NASA's NFAC wind tunnels [PDF]
The National Full-Scale Aerodynamics Complex (NFAC) is a unique combination of wind tunnels that allow the testing of aerodynamic and dynamic models at full or large scale. It can even accommodate actual aircraft with their engines running.
Edenborough, H. Kipling
core +1 more source
Requirements for regional short-haul air service and the definition of a flight program to determine neighborhood reactions to small transport aircraft [PDF]
An evaluation of the current status and future requirements of an intraregional short haul air service is given. A brief definition of the different types of short haul air service is given. This is followed by a historical review of previous attempts to
Bollinger, L. +3 more
core +1 more source
Hover performance tests of baseline metal and Advanced Technology Blade (ATB) rotor systems for the XV-15 tilt rotor aircraft [PDF]
Rotor hover performance data were obtained for two full-scale rotor systems designed for the XV-15 Tilt Rotor Research Aircraft. One rotor employed the rectangular planform metal blades (rotor solidity = 0.089) which were used on the initial flight ...
Alexander, H. +4 more
core +1 more source
An Over-Actuated Hexacopter Tilt-Rotor UAV Prototype for Agriculture of Precision: Modeling and Control. [PDF]
Sensors (Basel)Pimentel GO +4 more
europepmc +1 more source
An assessment of the capability to calculate tilting prop-rotor aircraft performance, loads and stability [PDF]
Calculated performance, loads, and stability of the XV-15 tilt rotor research aircraft are compared with wind tunnel and flight measurements, to define the level of the current analytical capability for tilting prop rotor aircraft, and to define the ...
Johnson, W.
core +1 more source
NASA's aeronautics program: Systems technology and experimental program [PDF]
The appropriateness of the division of effort between the directed to the solution of near-term problems and that directed to long-term technical advances in the program is addressed. Comparisons between in-house work and out-of-house work are presented.
core +1 more source
Langley rotorcraft structural dynamics program: Background, status, accomplishments, plans [PDF]
Excessive vibration is the most common technical problem to arise as a show stopper in the development of a new rotorcraft. Vibration predictions have not been relied on by the industry during design because of deficiencies in finite element dynamic ...
Kvaternik, Raymond G.
core +1 more source