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  • Other Sources  (9)
  • 1
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    Evidence of atmospheric gravity wave perturbations of the Brunt-Vaisala frequency in the atmosphere (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A series of high altitude, medium resolution, measurements of temperature, pressure and turbulence have been performed by the Air Force Geophysics Laboratory. These measurements were conducted using the VIZ Manufacturing Co. microsondes with attached micro-thermal probes measuring the temperature structure coefficient. A typical atmospheric temperature measurement is given. Several small temperature inversions are evident in the troposphere. The stratosphere is marked with numerous fluctuations in the temperature profile. Microsondes provide temperature and pressure measurements every 4 seconds up to a maximum altitude of 30 km (MSL). Since the average ascent rate is 5 m/s, the altitude interval between the measurement reports is 20 m. The potential temperature is calculated from the temperature and pressure. Spectral analysis of atmospheric Brunt-Vaisala frequencies reveal spectra similiar to the velocity spectra of Dewan et al. (1984), Daniels (1982), and Endlich and Singleton (1969). The Brunt-Vaisala spectra indicate the existence of separate, distinguishable wave modes.
    Keywords: GEOPHYSICS
    Type: International Council of Scientific Unions, Middle Atmosphere Program. Handbook for MAP, Vol. 20; 7 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Evaluation of the tilt rotor concept: The XV-15's role (1978)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: The need for an aircraft combining the efficient vertical takeoff and landing capability of a helicopter with the efficient high speed characteristics of a fixed wing turboprop is examined. The ability of the tilt rotor concept to fill this requirement and examples as to its potential usefulness in both military and civil missions is discussed.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AGARD Rotorcraft Design
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Analytical study of a free-wing/free-trimmer concept (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The free-wing/free-trimmer is a NASA-Conceived extension of the free-wing concept intended to permit the use of high-lift flaps. Wing pitching moments are balanced by a smaller, external surface attached by a boom or equivalent structure. The external trimmer is, itself, a miniature free wing, and pitch control of the wing-trimmer assembly is effected through a trailing-edge control tab on the trimmer surface. The longitudinal behavior of representative small free-wing/free-trimmer aircraft was analyzed. Aft-mounted trimmer surfaces are found to be superior to forward trimmers, although the permissible trimmer moment arm is limited, in both cases, by adverse dynamic effects. Aft-trimmer configurations provide excellent gust alleviation and meet fundamental stick-fixed stability criteria while exceeding the lift capabilities of pure free-wing configurations.
    Keywords: AERODYNAMICS
    Type: NASA-CR-2946
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Investigation of the Applicability of the Free-wing Principle to Light, General Aviation Aircraft (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Gust-alleviation benefits for aircraft employing an unconventional wing, free to pivot about a spanwise axis forward of its aerodynamic center and subject only to aerodynamic pitching moments imposed by lift and drag forces and a trailing-edge control surface are reviewed.
    Keywords: AERODYNAMICS
    Type: NASA-CR-2046
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Evaluation of the gust-alleviation characteristics and handling qualities of a free-wing aircraft (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Dynamic characteristics of aircraft with wings free to pivot spanwise axis
    Keywords: AIRCRAFT
    Type: NASA-CR-1523
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    XV-15 tilt rotor test - Progress report (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: In a continuing effort to expand the versatility of their aircraft, VTOL designers have for many years tried to combine the desirable features of various concepts into a single aircraft. This is a formidable task and most efforts have met with limited success. This paper explores the need for an aircraft combining the efficient VTOL capability of a helicopter with the efficient high speed characteristics of a fixed wing turboprop. The ability of the tilt rotor concept to fill this requirement and examples as to its potential usefulness in both military and civil missions is discussed. The history of the concept and the status of the current Army/NASA/Bell XV-15 program and its role in proving the viability of the concept are reviewed.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: SAE PAPER 770953 , Aerospace Meeting; Nov 14, 1977 - Nov 17, 1977; Los Angeles, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Status report on XV-15 Tilt Rotor Test Program (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The XV-15 Tilt Rotor Research Aircraft Program has progressed from the design and fabrication stage to the test phase and is now beginning that portion of the program which will culminate in the determination of the viability of this promising concept. This paper will review the joint Army/NASA/Bell Helicopter Textron (BHT) XV-15 program as it currently stands, including the results of the experience gained during the design and fabrication phases and testing to date. Highlights of the overall Tilt Rotor Program will be discussed exploring the potential of this concept to result in a new generation of highly productive VTOL systems.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AHS 77-33-64 , Annual National Forum; May 09, 1977 - May 11, 1977; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Phase Modulation Stops Levitated Sample Rotation (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Rotation of sample in acoustic levitator prevented by relatively simple phase-modulation scheme. Technique differs from older methods; no feedback control or observation of sample required, nor necessary to carefully tune or detune two oscillators to precise frequency differences from resonance.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-16002 , NASA Tech Briefs (ISSN 0145-319X); 8; 2; P. 286
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    The gust-alleviation characteristics and handling qualities of a free-wing aircraft (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Free wing aircraft dynamic characteristics, discussing gust alleviation and handling qualities
    Keywords: AIRCRAFT
    Type: AIAA PAPER 70-947 , AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS, GUIDANCE, CONTROL AND FLIGHT MECHANICS CONFERENCE; Aug 17, 1970 - Aug 19, 1970; SANTA BARBARA, CA
    Format: text
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