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  • Forst  (4)
  • Fluid Mechanics and Thermodynamics
  • 1980-1984
  • 1940-1944  (6)
  • 1941  (5)
  • 1940  (1)
Collection
Years
  • 1980-1984
  • 1940-1944  (6)
Year
  • 1
    Publication Date: 2019-08-26
    Description: This preliminary investigation was made to study the hydrodynamic properties and general behavior of simple hydrofoils. Six 5- by 30-inch plain, rectangular hydrofoils were tested in the NACA tank at various speeds, angles of attack and depths below the water surface. Two of the hydrofoils had sections representing the sections of commonly used airfoils, one had a section similar to one developed Guidoni for use with hydrofoil-equipped seaplane floats, and three had sections designed to have constant chordwise pressure distributions at given values of the lift coefficient for the purpose of delaying the speed at which cavitation begins. The experimental results are presented as curves of the lift and drag coefficients plotted against speed for the various angles of attack and depths for which the hydrofoils were tested. A number of derived curves are included for the purpose of better comparing the characteristics of the hydrofoils and to show the effects of depth. Several representative photographs show the development of cavitation on the the upper surface of the hydrofoils. The results indicate that properly designed hydrofoil sections will have excellent characteristics and that the speed at which cavitation occurs may be delayed to an appreciable extent by the use of suitable sections.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-SR-158
    Format: application/pdf
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  • 2
    Publication Date: 2019-07-12
    Description: A method is presented of comparing the performance, weight, and general dimensional characteristics of inter-coolers. The performance and dimensional characteristics covered in the comparisons are cooling effectiveness, pressure drops and weight flows of the charge and cooling air, power losses, volume, frontal area, and width. A method of presenting intercooler data is described in which two types of charts are plotted; (1) A performance chart setting forth all the important characteristics of a given intercooler and (2) a replot of these characteristics for a number of intercoolers intended to assist in making a selection to satisfy a given set of installation conditions. The characteristics of commercial intercoolers obtained from manufacturers' data and of some computed designs are presented on this basis. A standard test procedure and instrumentation are suggested whereby comparable data may be obtained by different testing organizations.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-SR-192
    Format: application/pdf
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  • 3
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    In:  Mitt. Biol. Reichsanst. H. 63: 46-48
    Publication Date: 1941
    Description: Beschreibungen zum Gesundheitszustand einer Population von Nonnen, ihrer Lebens- und Vermehrungsfähigkeit im Zusammenhang mit dem Massenauftreten, aber auch dem Zusammenbrechen der Population KATASTER-BESCHREIBUNG: Verringerung der Populationssichte durch Räuber kann bei 95% liegen KATASTER-DETAIL:
    Keywords: Deutschland ; 1900-1940 ; Insekten ; Forst ; Pflanzenschädling
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  • 4
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    In:  Dtsch. Forstztg. 10: 307-308
    Publication Date: 1941
    Description: Beschreibung der großen Frassschäden der letzten Jahrzehnte, bezug der Temperatur und des Niederschlages auf die Entwicklungsmöglichkeit einer Population KATASTER-BESCHREIBUNG: Ziiterte Untersuchungen zur Entwicklung der Nonnenraupe KATASTER-DETAIL: Delta T+ (Temperaturoptimum von 21.5°C, Ende April-Anfang Mai), dann günstige Entwiclungsbedingungen Delta Nied- (relative Feuchte schwankt zwischen 50-100%), dann Absterben großer Zahl futtersuchender Raupen
    Keywords: Deutschland, teilw. einzelne Regionen ; 1850-1940 ; Insekten ; Luftfeuchte ; Fichte ; Forst ; Kiefer ; Niederschlag ; Pflanzenschädling ; Temperatur
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  • 5
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    In:  Mitt. Forstwirtsch. u. -wissensch. 12: 25-68
    Publication Date: 1941
    Description: Auswertung verschiedener Parameter (Nonnenraupen, Falterflug) in unterschiedlichen Überwachungsbereichen der Forstentomologischen Dienststellen, Befallsermittlungsverfahren nach der Wellensteinschen Methode KATASTER-BESCHREIBUNG: Rhytmische Schwankungen der plötzlichen Übervermehrung, 10 oder 12 jährige Perioden, Bezug zu Schwankungen der Umweltbedingungen KATASTER-DETAIL:
    Keywords: Nord- und Mitteldeutschland ; 1939-40 ; Insekten ; Fichte ; Forst ; Kiefer ; Pflanzenschädling
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  • 6
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    In:  Ztschr. angew. Ent. 28: 357-365
    Publication Date: 1941
    Description: Vertrocknungsprozess der Espe, Beschreibung und Beziehung verschiedener Insekten und Pilze an diesem Prozess KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Finnland ; 1936-1941 ; Insekten ; Forst ; Pflanzenschädling
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