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  • Aircraft Design, Testing and Performance  (2)
  • Applied geophysics  (2)
  • 1935-1939  (4)
  • 1936  (4)
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  • 1935-1939  (4)
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  • 1
    facet.materialart.
    Unbekannt
    The amplitudes of waves to be expected in seismic prospecting (1936)
    In:  Geophysics, Milano, Gustav Fischer, vol. 1, no. 3, pp. 252-256, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publikationsdatum: 1936
    Schlagwort(e): Applied geophysics ; Amplitude ; Seismics (controlled source seismology)
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    BIBLIOGRAFIE SEISMOLOGIE
  • 2
    facet.materialart.
    Unbekannt
    On some problems concerning the seismic field methods (1936)
    In:  Beiträge zur angewandten Geophysik, Milano, Gustav Fischer, vol. 6, no. 3, pp. 125-140, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publikationsdatum: 1936
    Schlagwort(e): Applied geophysics ; Seismics (controlled source seismology)
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    BIBLIOGRAFIE SEISMOLOGIE
  • 3
    facet.materialart.
    Unbekannt
    Relative Efficiencies and Design Charts for Various Engine-Propeller Combinations, Special Report (1936)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: The relative efficiencies of various engine-propeller combinations were the subject of a study that covered the important flight conditions, particularly the take-off. Design charts that graphically correlate the various propeller parameters were prepared to facilitate the solution of problems and also to c1arify the conception of the relationships of the various engine-propeller design factors. It is shown that, among the many methods for improving the take-off thrust, the use of high-pitch, large-diameter controllable propellers turning at low rotational speeds is probably the most generally promising. With such a combination the take-off thrust may be further increased, at the expense of a small loss in cruising efficiency, by compromise designs wherein the pitch setting is slightly reduced and the diameter is further increased. The degree of compromise necessary to accomplish the maximum possible take-off improvement depends on such design factors as overspeeding and overboosting at take-off as well as depending on the design altitude. Both overspeeding and designing for altitude operation have the same effect on the take-off thrust as compromising in that the propulsive efficiency is increased thereby; boosting the engine, however, has the reverse effect on the propulsive efficiency, although the brake horsepower is increased.
    Schlagwort(e): Aircraft Design, Testing and Performance
    Materialart: NACA-SR-55
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 4
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    Unbekannt
    Tank Tests of the Effect of Rivet Heads, etc., on the Water Performance of a Seaplane Float, Special Report (1936)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: A 1/3.5 full-size model of the Mark V float of the Bureau of Aeronautics, Navy Department, was tested in the NACA tank both with smooth painted bottom surfaces and with roundhead rivets, plate laps, and keel plates fitted to simulate the actual bottom of a metal float. The augmentation in water resistance due to the added roughness was found to be from 10-12% at the hum speed and from 12-14% at high speeds. The effect of the roughness of the afterbody was found to be negligible except at high trims. The model data were extrapolated to full size by the usual method which assumes the forces to vary according to Froude's law, and in the case of the smooth model by a method of separation that takes into account the effect of scale on the frictional resistance. It was concluded that the effect of rivet heads on the takeoff performance of a relatively high-powered float seaplane is of little consequence but that it may be of greater importance in the case of more moderately powered flying boats.
    Schlagwort(e): Aircraft Design, Testing and Performance
    Materialart: NACA-SR-51
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
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