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  • Other Sources  (26)
  • 1925-1929
  • 1
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    Pressure Distribution Over Airfoils at High Speeds (1927)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report deals with the pressure distribution over airfoils at high speeds, and describes an extension of an investigation of the aerodynamic characteristics of certain airfoils which was presented in NACA Technical Report no. 207. The results presented in report no. 207 have been confirmed and extended to higher speeds through a more extensive and systematic series of tests. Observations were also made of the air flow near the surface of the airfoils, and the large changes in lift coefficients were shown to be associated with a sudden breaking away of the flow from the upper surface. The tests were made on models of 1-inch chord and comparison with the earlier measurements on models of 3-inch chord shows that the sudden change in the lift coefficient is due to compressibility and not to a change in the Reynolds number. The Reynolds number still has a large effect, however, on the drag coefficient. The pressure distribution observations furnish the propeller designer with data on the load distribution at high speeds, and also give a better picture of the air-flow changes.
    Type: NACA-TR-255
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Aerodynamic Characteristics of Airfoils at High Speeds (1925)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report deals with an experimental investigation of the aerodynamical characteristics of airfoils at high speeds. Lift, drag, and center of pressure measurements were made on six airfoils of the type used by the air service in propeller design, at speeds ranging from 550 to 1,000 feet per second. The results show a definite limit to the speed at which airfoils may efficiently be used to produce lift, the lift coefficient decreasing and the drag coefficient increasing as the speed approaches the speed of sound. The change in lift coefficient is large for thick airfoil sections (camber ratio 0.14 to 0.20) and for high angles of attack. The change is not marked for thin sections (camber ratio 0.10) at low angles of attack, for the speed range employed. At high speeds the center of pressure moves back toward the trailing edge of the airfoil as the speed increases. The results indicate that the use of tip speeds approaching the speed of sound for propellers of customary design involves a serious loss in efficiency.
    Type: NACA-TR-207
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Stressed Coverings in Naval and Aeronautic Construction (1928)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: We propose to make a study of the difficulties in using stressed coverings and their appropriate solutions. Fatigue and buckling are also discussed.
    Type: NACA-TM-447
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Untersuchungen über Beziehungen zwischen Witterung und Ernteertrag in der Landwirtschaft (1928)
    In:  Diss., Hohenheim.
    Details
    Publication Date: 1928
    Description: Beziehung zwischen Witterung (unterteilt in einzelne Monate) und Ertragshöhe mithilfe der Rangordnungs- und der Korrelationsmethode KATASTER-BESCHREIBUNG: Einfluss der Witterung (Temperatur, Niederschlag, Sonnenscheindauer) auf den Ertrag von Winterweizen, Sommerweizen, Sommergerste, Wintergerste, Hafer und Runkelrüben auf dem Versuchsfeld (wasserundurchlässiger Boden) KATASTER-DETAIL: Delta Sonn (Oktober bis November)+, dann Erträge (Winterweizen) +; Delta Sonn (Dezember bis März)+, dann Erträge (Winterweizen) -; Delta Sonn (April) -, dann Erträge (Winterweizen) +; Delta Nied (April) +, dann Erträge (Winterweizen) +; Delta Nied (Mai, Juni und Juli) -, dann Erträge (Winterweizen) +; Delta Nied (August bis Oktober) +, dann Erträge (Winterweizen) +; Delta T (April) -, dann Erträge (Winterweizen) +; (Details sowie Informationen für Sommerweizen, Sommergerste, Wintergerste, Hafer und Runkelrüben siehe Artikel)
    Keywords: Hohenheim (Baden-Württemberg) ; 1914-25 ; Ertrag ; Getreide ; Hafer ; Klima ; Korrelationsmethode ; Niederschlag ; Rangordnungsmethode ; Temperatur ; Weizen ; Witterung ; Hackfrüchte
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    BIBLIOGRAPHY INKA BB
  • 5
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    Untersuchungen über Beziehungen zwischen Witterung und Ernteertrag in der Landwirtschaft (1926)
    In:  Zeitschrift für Pflanzenernährung, Düngung, Bodenkunde 16.
    Details
    Publication Date: 1926
    Description: Beziehungen zwischen Witterung und Ernteertrag KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Hohenheim (Baden-Württemberg) ; 1914-25 ; Ertrag ; Witterung
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    BIBLIOGRAPHY INKA BB
  • 6
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    Alloys similar to duralumin made in other countries than Germany (1925)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Attempts by other countries to develop patents for alloys similar to duralumin are presented. Duralumin is aluminum alloyed with 3.5-4.5% copper, 0.5% magnesium, and 0.25-1% of manganese.
    Type: NACA-TM-314
    Format: application/pdf
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  • 7
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    Light aeroplane engine development (1925)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: It has frequently been stated and written that in order to popularize light aircraft the first essential is the production of a reliable engine capable of being easily maintained and having a long life, at the same time selling at a low figure. It is desired to point out the difficulties in the way of realizing this ideal before remarking on the claims of the various types for adoption.
    Type: NACA-TM-309
    Format: application/pdf
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  • 8
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    Strength of tubing under combined axial and transverse loading (1929)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Type: NACA-TN-307
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Resistance of streamline wires (1928)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This note contains the results of tests to determine the resistance of four sizes of streamline wire. The investigation was conducted in the six-inch wind tunnel of the National Advisory Committee for Aeronautics. The tests were made at various velocities and it was found that the resistance of streamline wires was considerably less than that of round wires of equivalent strength. Scale effect was also found since, with an increase of Reynolds Number, a decrease in the resistance coefficient was obtained.
    Type: NACA-TN-279
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Tests on Models of Three British Airplanes in the Variable Density Wind Tunnel (1928)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report contains the results of tests made in the National Advisory Committee for Aeronautics variable density wind tunnel on three airplane models supplied by the British Aeronautical Research Committee. These models, the BE-2E with R.A.F. 19 wings, the British Fighter with R.A.F. 15 wings, and the Bristol Fighter with R.A.F. 30 wings, were tested over a wide range in Reynolds numbers in order to supply data desired by the Aeronautical Research Committee for scale effect studies. The maximum lifts obtained in these tests are in excellent agreement with the published results of British tests, both model and full scale. No attempt is made to compare drag data, owing to the emission of tail surfaces, radiator, etc., from the model, but is shown that the scale effect observed on the drag coefficients in these tests is due to a large extent to the parts of the models other than the wings. (author)
    Type: NACA-TR-279
    Format: application/pdf
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