National Advisory Committee for Aeronautics (NACA) - 3 Matching Results

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An analysis of the transition of a helicopter from hovering to steady autorotative vertical descent

Description: From Introduction: "This report is the second phase of a broad program of study of the transient motions of helicopters in autorotative flight. The first phase (reference 1) dealt with the steady-state condition of autorotative vertical descent. This report is concerned with the the transition from the steady condition of hovering to the steady autorotative descent."
Date: June 1949
Creator: Nikolsky, A A & Seckel, Edward
Partner: UNT Libraries Government Documents Department

An Analysis of the Variation With Altitude of Effective Gust Velocity in Convective-Type Clouds

Description: From Introduction: "In the present paper, the variation of effective gust velocity in convective-type clouds with altitude is investigated. Data obtained during 1941 and 1942 at altitudes up to 34,000 feet and data obtained more recently from the Thunderstorm Project (reference 5) at altitudes up to 26,000 feet are utilized for this purpose. Consideration is given in analyzing the results both to data for the range
Date: June 1948
Creator: Tolefson, H. B.
Partner: UNT Libraries Government Documents Department

Altitude-wind-tunnel investigation of thrust augmentation of a turbojet engine IV: performance with tail-pipe burning and water injection

Description: From Introduction: "Thrust augmentation of an axial-flow-type turbojet engine by burning fuel in the tail pipe is discussed in references 1 to 3. Thrust augmentation of the same turbojet engine by water injection at the compressor inlet is reported in reference 4."
Date: June 15, 1948
Creator: Dietz, Robert O., Jr.; Wishnek, George & Kuenzig, John K.
Partner: UNT Libraries Government Documents Department