Results 61 to 70 of about 7,853 (137)

GRID3C: Computer program for generation of C type multilevel, three dimensional and boundary conforming periodic grids [PDF]

open access: yes
A fast computer program, GRID3C, was developed for accurately generating periodic, boundary conforming, three dimensional, consecutively refined computational grids applicable to realistic axial turbomachinery geometries. The method is based on using two
Dulikravich, D. S.
core   +1 more source

An Exploration of the Performance and Acoustic Characteristics of UAV-Scale Stacked Rotor Configurations [PDF]

open access: yes
As interest grows in rotor- and propeller-driven electric vertical takeoff and landing (eVTOL) aircraft for the Urban Air Mobility market, there is a potential for previously studied concepts to reemerge due to the opportunities afforded by novel ...
Fei, Xiaofan   +5 more
core   +1 more source

Satellite-aided mobile communications limited operational test in the trucking industry [PDF]

open access: yes
An experiment with NASA's ATS-6 satellite, that demonstrates the practicality of satellite-aided land mobile communications is described. Satellite communications equipment for the experiment was designed so that it would be no more expensive, when mass ...
Anderson, R. E.   +2 more
core   +1 more source

Coaxial Compound Helicopter for Confined Urban Operations [PDF]

open access: yes
A rotorcraft was designed for military operations in a confined urban environment. The specifications included major increases in useful load, range, and speed relative current aircraft capabilities, with a size constraint based on the dimensions of ...
Elmore, Joshua F.   +4 more
core   +1 more source

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