Development and Testing of a Commercial Turbofan Engine for High Altitude UAV Applications

2001 ◽  
Author(s):  
Maurice Weinberg ◽  
John Wyzykowski
Keyword(s):  
High Altitude ◽  
Turbofan Engine

scholarly journals Optimization for the Starting Process of Turbofan Engine Under High-Altitude Environment

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 55797-55806
Author(s):  
Ma Song ◽  
Tan Jianguo ◽  
Su Sanmai ◽  
Zhu Mingyan
Keyword(s):  
High Altitude ◽  
Turbofan Engine ◽  
Starting Process

scholarly journals Evaluation of Potential Engine Concepts for a High Altitude Long Endurance Vehicle

1988 ◽  
Author(s):  
Edward J. Kowalski
Keyword(s):  
High Altitude ◽  
Propulsion System ◽  
Turbofan Engine ◽  
Counter Rotation ◽  
Long Endurance ◽  
Bypass Ratio

A potential need has been identified for a High Altitude Long Endurance (HALE) aircraft to augment current surveillance and engagement capability. HALE platforms offer mission flexibility and survivability which can complement ground based surveillance and engagement systems. Current mission requirements include a loiter altitude of 45,000 to 60,000 feet and a loiter time of 12 to 24 hours. The HALE aircraft will also be required to carry a sensor payload weight between 50,000 and 100,000 pounds. This paper will evaluate the potential of several propulsion system candidates. Engines to be examined include the “classical” turbofan engine with bypass ratios up to eight, the “ultra high bypass ratio” turbofan with bypass ratios up to 20, General Electric’s Unducted Fan (UDF) and the turboprop in a pusher and tractor configuration with single and counter rotation propfans.

Contrast of Filament Bright Rims

1994 ◽  
Vol 144 ◽  
pp. 365-367
Author(s):  
E. V. Kononovich ◽  
O. B. Smirnova ◽  
P. Heinzel ◽  
P. Kotrč
Keyword(s):  
High Altitude ◽  
Line Profile ◽  
Line Center ◽  
Magnetic Structures ◽  
The Mean

AbstractThe Hα filtergrams obtained at Tjan-Shan High Altitude Observatory near Alma-Ata (Moscow University Station) were measured in order to specify the bright rims contrast at different points along the line profile (0.0; ± 0.25; ± 0.5; ± 0.75 and ± 1.0 Å). The mean contrast value in the line center is about 25 percent. The bright rims interpretation as the bases of magnetic structures supporting the filaments is suggested.

Clean Electron Microscope Substrate Films Used for Micrometeorite Collection and Study

1967 ◽  
Vol 25 ◽  
pp. 366-367
Author(s):  
D. M. Davies ◽  
R. Kemner ◽  
E. F. Fullam
Keyword(s):  
Thin Film ◽  
Electron Microscope ◽  
High Altitude ◽  
Amyl Acetate ◽  
Temperature Variations ◽  
Film Forming ◽  
Film Specimen ◽  
Particulate Contaminants

All serious electron microscopists at one time or another have been concerned with the cleanliness and freedom from artifacts of thin film specimen support substrates. This is particularly important where there are relatively few particles of a sample to be found for study, as in the case of micrometeorite collections. For the deposition of such celestial garbage through the use of balloons, rockets, and aircraft, the thin film substrates must have not only all the attributes necessary for use in the electron microscope, but also be able to withstand rather wide temperature variations at high altitude, vibration and shock inherent in the collection vehicle's operation and occasionally an unscheduled violent landing.Nitrocellulose has been selected as a film forming material that meets these requirements yet lends itself to a relatively simple clean-up procedure to remove particulate contaminants. A 1% nitrocellulose solution is prepared by dissolving “Parlodion” in redistilled amyl acetate from which all moisture has been removed.

Dynamic electrocardiography at high altitude

1966 ◽  
Vol 118 (2) ◽  
pp. 132-138 ◽  
Author(s):  
J. S. Sanders
Keyword(s):  
High Altitude

Development of techniques for the evaluation of high altitude pressure suits.

1959 ◽  
Author(s):  
Renato Contini ◽  
Rudolfs Drillis ◽  
Lawrence Slote
Keyword(s):  
High Altitude
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