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  • Other Sources  (6)
  • 1939-40  (3)
  • Aircraft Propulsion and Power  (3)
  • 1940-1944  (6)
  • 1941  (6)
  • 1
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    Zur Prognose des Schadauftretens der Kiefernbuschhornblattwespe (Diprion pini L.) (1941)
    In:  Ztschr. Forst-, Jagdwesen 73: 201-246
    Details
    Publication Date: 1941
    Description: Beschreibung des Zusammenhangs zwischen der Eizahl und der Kokonzahl der Kiefernhornblattwespe auf das Massenauftreten KATASTER-BESCHREIBUNG: Betimmung der kritischen Anzhal Eier und der kritischen Anzahl Winter- und Sommerkokons für das Massenauftreten KATASTER-DETAIL:
    Keywords: Sachsen, Brandenburg, Mecklenburg-Vorpommern ; 1939-40 ; Insekten ; Kiefer ; Pflanzenschädling
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    BIBLIOGRAPHY INKA BB
  • 2
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    Die Übervermehrung von Diprion pini L. im westslowakischen Kieferngebiet (1941)
    In:  Ztschr. Pfl.krankh. 51: 257-278
    Details
    Publication Date: 1941
    Description: Beschreibung der Massenvermehrung der Kiefernblattwespe, Hauptgrung ist die Umwandlung von ursprünglich Laubwaldgesellschaften in reine Kieferngesellschaften, Bedeutung der Temperatur für das Überliegen der Larven KATASTER-BESCHREIBUNG: Temperatur und Luftfeuchte für das Überliegen der Larven entscheidend und damit auch für ein Massenauftreten im darauffolgenden Jahr, Begünstigung der Parasitierung der Kieferblattwespe KATASTER-DETAIL: Delta T- (Juli-August und im Winter), dann Geschlechterfolge von Diprion pini stark dezimiert
    Keywords: Slowakei ; 1939-40 ; Insekten ; Luftfeuchte ; Kiefer ; Pflanzenschädling ; Temperatur ; Parasit
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    BIBLIOGRAPHY INKA BB
  • 3
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    Zur Prognose von Nonnenvermehrungen (1941)
    In:  Mitt. Forstwirtsch. u. -wissensch. 12: 25-68
    Details
    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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    BIBLIOGRAPHY INKA BB
  • 4
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    Wind-tunnel Tests of Four Curtiss Propellers Embodying Different Blade Sections (1941)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Tests of four 10-foot propellers were made in the propeller-research tunnel for the Army Air Corps to check flight and static thrust test results made on several propellers embodying Clark Y and modified NACA 16-series sections. These propellers were identical as to diameter and activity factor and very closely identical in thickness ratio and pitch distribution. The blades embodied sections with both single- and double-cambered Clark Y, modified NACA 16-series, and a combination of Clark Y and modified NACA-16 airfoils. Tests covered a range of blade angles from 20 deg. to 70 deg., and were all made at tip speeds below 280 feet per second. Although these tests were not conclusive in themselves, owing to the conditions under which they were made, the results seem to check the flight and static tests as closely as would be expected.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-WR-L-569
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Performance Characteristics of an Aircraft Engine with Exhaust Turbine Supercharger, Special Report (1941)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The Pratt and Whitney Aircraft company and the Naval Aircraft Factory of the United States Navy cooperated in a laboratory and flight program of tests on an exhaust turbine supercharger. Two series of dynamometer tests of the engine super-charger combination were completed under simulated altitude conditions. One series of hot gas-chamber tests was conducted by the manufacturer of the supercharger. Flight demonstrations of the supercharger installed in a twin-engine flying boat were terminated by failure of the turbine wheels. The analysis of the results indicated that a two-stage supercharger with the first-stage exhaust turbine driven will deliver rated power for a given indicated power to a higher altitude, will operate more efficiently, and will require simpler controls than a similar engine with the first stage of the supercharger driven from the crankshaft through multispeed gears.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-SR-194
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Wind-Tunnel Tests of Several Model Tractor-Propeller and Pusher-Propeller Wing Extension-Shaft Arrangements, Special Report (1941)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Tests were made in the 20-foot propeller-research tunnel to investigate the possibility of obtaining increased net efficiencies of propeller-nacelle units by enclosing the engines in the wings and by using extension shafts. A wing of 5-foot chord was fitted with a propeller drive assembly providing for several axial locations of tractor propellers and pusher propellers. A three-blade 4-foot propeller and a three-blade 3 1/2-foot propeller of special design were tested in this wing with spinners and fairings ranging in diameter from 6 to 16 inches. A 16-inch NACA cowling was tested for comparative purposes. Two types of cuffs were also employed. It was found that the net efficiency of a conventional round-shank propeller mounted on an extension shaft in front of or behind a wing increased with an increase in the diameter of the spinner and the shaft housing within the scope of the tests. The largest spinner used had a diameter that might favorably compare with that of a radial engine cowling. The efficiencies for the pusher position appeared to be more critically affected by spinner size than those for the tractor position. The spinners with large diameters for the pusher position resulted in a higher efficiency than those for the corresponding tractor arrangements; the reverse was true for the small spinners. The use of propeller cuffs in combination with a spinner of small diameter generally resulted in net efficiencies that were comparable with those found for the large-spinner combinations.
    Keywords: Aircraft Propulsion and Power
    Type: NACA-SR-196
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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