CoA. Reports

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Browsing CoA. Reports by Author "Boyd, E. A."

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    Aerodynamic characteristics of a hypersonic parachute
    (College of Aeronautics, 1961-11) Boyd, E. A.
    Newtonian theory, both in the form of the Modified-Newtonian and the Newton- Busemann pressure laws, is used to find the shape, cloth area and drag of the axisymmetric canopy of a hypersonic parachute, whose only load-carrying fibres are longitudinal ones. As an example, an estimate is made of the size of canopy needed to give a drag of 20,000 lb. in flight at a Mach number of 10 at 100,000 feet altitude.
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    Busemann correction to the characteristics of the two-dimensional hypersonic sail
    (College of Aeronautics, 1960-11) Boyd, E. A.
    The two-dimensional hypersonic sail is examined using the Newton- Busemann pressure law. The results are compared with those of Daskin and Feldman (1958) who used the empirical modified Newtonian pressure law. It is found that for a given chord length of sail a corrected sail will give a specified lift for a smaller tension in the sail. At a flight Mach number of 10 at 100,000 ft. the tension in one particular sail considered could be supported with a working stress of about 20 tons/in[squared].
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    The characteristics of a two-dimensional supersonic sail
    (College of Aeronautics, 1960-12) Boyd, E. A.
    The two-dimensional supersonic sail is analysed using Busemann's second-order theory. It is found to have a universal shape, which is part of a Sici spiral. Aerodynamic characteristics are calculated for a few sails. The tension in sails flying at Mach numbers of 2 and 3 at altitudes of 20,000 and 70,000 feet is large and suggests that wire sails will be needed for flight under these conditions.