A study of previously built LTA aircraft led to a comparison study of two concepts for a high-altitude mission, both powered with air-breathing engines: the first an aerodynamically shaped airship flown to and from the 70,000 foot design altitude; the second a naturally shaped balloon, free-ballooning to altitude, powered for 24 hours against 10 knot winds, and payload and powerplant parachuted to earth after the flight. The air-breathing engines appeared marginal on normal fuels, but the advantages of smaller total volume and lower constructional cost clearly favored the naturally shaped balloon for this 10-knot wind requirement. A parametric study of this naturally shaped balloon, electrically-powered, was undertaken. Boundaries were 60,000 to 100,000 feet altitude, airspeeds 0 to 45 knots, and flight durations 12 to 96 hours. The altitude and time limits can be achieved at an airspeed of 15 knots. For this shaped balloon, 45-knot speeds are not practical. It is recommended that the naturally shaped balloon with electric propulsion system be built and flown to demonstrate the concept. (Author)


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    Titel :

    Investigation of Powered Lighter-Than-Air-Vehicles


    Beteiligte:
    J. J. Vorachek (Autor:in)

    Erscheinungsdatum :

    1968


    Format / Umfang :

    110 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch





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    Mayer, N. J. | NTRS | 1979


    Large lighter-than-air vehicles

    MAYER, N. | AIAA | 1979


    High-Altitude Lighter-Than-Air Powered Platform

    Onda, Masahiko / Morikawa, Yasushi | SAE Technical Papers | 1991


    Remotely Piloted Lighter-Than-Air Vehicles

    Onda, M. / University of Bristol | British Library Conference Proceedings | 1993