Results 71 to 80 of about 189,174 (279)

A review of US Army aircrew-aircraft integration research programs [PDF]

open access: yes
If the U.S. Army's desire to develop a one crew version of the Light Helicopter Family (LHX) helicopter is to be realized, both flightpath management and mission management will have to be performed by one crew.
Aiken, E. W., Key, D. C.
core   +1 more source

Resource reallocation across successive systemic innovations: How Rolls‐Royce shaped the evolution of the turbojet, turboprop, and turbofan

open access: yesStrategic Management Journal, EarlyView.
Abstract Research Summary Despite the importance of resource reallocation in shaping a variety of strategic outcomes, strategy scholars have paid only limited attention to the processes by which firms reallocate their resources across successive systemic innovations.
Gino Cattani   +2 more
wiley   +1 more source

The impact of urban operations on helicopter noise requirements [PDF]

open access: yes
The interrelationship of urban helicopter operations, helicopter noise, and the establishment of urban public-use heliports is discussed. Public resistance to urban helicopter operations due to concern for safety and noise is shown to negatively impact ...
Spector, S. R.
core   +1 more source

Scoop attachment makes helicopter recoveries easier and safer [PDF]

open access: yes, 1965
Helicopter with rigid boom and net attachment performs rescue or recovery operations easily and safely. The attachment in the front of the helicopter scoops objects from difficult and otherwise inaccessible areas and pivots to the side hatch of the ...
Koons, W. E.
core   +1 more source

Rethinking Face‐to‐Face Interaction: Lessons from Studies of “Autistic Sociality”

open access: yesSymbolic Interaction, EarlyView.
Face‐to‐face interaction is a foundational concept in microsociology. This article surveys the social experiences of autistic people, who are commonly known for having a strained relationship with interactions face to face. By interpretively reviewing and synthesizing the broader literature on “autistic sociality,” the article provides a nuanced ...
Lars E. F. Johannessen
wiley   +1 more source

Effect of Dynamic Tilting Speed on the Flow Field of Distributed Multi-Propeller Tilt-Wing Aircraft During Transition Flight

open access: yesMachines
Advances in distributed electric propulsion and urban air mobility technologies have spurred a surge of research on electric Vertical Take-Off and Landing (eVTOL) aircraft.
Jiahao Zhu   +4 more
doaj   +1 more source

HELICOPTER KIT

open access: yes, 2018
A kit (1) for a helicopter (2) is described, the helicopter (2) comprising a fuselage (3) and a rotor (4); the kit (1) comprises at least one device (15) adapted to dampen the vibrations transmitted from the rotor (4) to the fuselage (2) and to be interposed between the fuselage (2) and the rotor (4); the device (15), in turn, comprises a first ...
Bottasso, Luigi   +4 more
openaire   +3 more sources

Comparison of predicted engine core noise with proposed FAA helicopter noise certification requirements [PDF]

open access: yes
Calculated engine core noise levels, based on NASA-Lewis prediction procedures, for five representative helicopter engines are compared with measured total helicopter noise levels and proposed FAA helicopter noise certification requirements.
Groesbeck, D. E., Vonglahn, U.
core   +1 more source

Simulation of tail boom vibrations using main rotor-fuselage Computational Fluid Dynamics (CFD) [PDF]

open access: yes, 2017
In this work, fully-resolved rotor-fuselage interactional aerodynamics is used as the forcing term in a model based on the Euler-Bernoulli equation, aiming to simulate helicopter tail-boom vibration.
Barakos, George N.   +4 more
core   +2 more sources

Advancing Model‐Based Systems Engineering in the Development of Naval Vessel Systems Architecture

open access: yesSystems Engineering, EarlyView.
ABSTRACT The increasing complexity of modern naval vessels due to technological advancements poses challenges for early‐stage ship design (ESSD). Developing well‐defined system architectures and adopting systems engineering approaches are essential to address these challenges.
Vasileios Sideris   +3 more
wiley   +1 more source

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