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  • AERODYNAMICS  (7)
  • 42.75  (6)
  • 1950-1954  (13)
  • 1953  (13)
  • 1
    Publication Date: 2013-08-31
    Description: Conference on aerodynamics of high speed aircraft
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-57121
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  • 2
    Publication Date: 2014-07-15
    Keywords: AERODYNAMICS
    Type: NACA-RM-A53G08
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  • 3
    Publication Date: 2014-07-15
    Description: Calculations have been made for the icing limit of a diamond airfoil at zero angle of attack in terms of the stream Mach number, stream temperature, and pressure altitude. The icing limit is defined as a wetted-surface temperature of 320 F and is related to the stream conditions by the method of Hardy. The results show that the point most likely to ice on the airfoil lies immediately behind the shoulder and is subject to possible icing at Mach numbers as high as 1.4.
    Keywords: AERODYNAMICS
    Type: NACA-TN-2861
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  • 4
    Publication Date: 2014-07-15
    Description: The effects of primary and. runback icing and frost formations on the drag of an 8-foot-chord NACA 651-212 airfoil section were investigated over a range of angles of attack from 20 to 80 and airspeeds up to 260 miles per hour for icing conditions with liquid-water contents ranging from 0.25 to 1.4 grams per cubic meter and datum air temperatures of -30 to 30 F. The results showed that glaze-ice formations, either primary or runback, on the upper surface near the leading edge of the airfoil caused large and rapid increases in drag, especially at datum air temperatures approaching 32 F and in the presence of high rates of water catch. Ice formations at lower temperatures (rime ice) did not appreciably increase the drag coefficient over the initial (standard roughness) drag coefficient. Cyclic de-icing of the primary Ice formations on the airfoil leading-edge section permitted the drag coefficient to return almost to the bare airfoil drag value. Runback icing on the lower surface did not present a serious drag problem except when heavy spanwise ridges of runback ice occurred aft of the heatable area. Frost formations caused rapid and large increases in drag with incipient stalling of the airfoil.
    Keywords: AERODYNAMICS
    Type: NACA-TN-2962
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  • 5
    Publication Date: 2014-07-15
    Keywords: AERODYNAMICS
    Type: NACA-RM-E53C26
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  • 6
    Publication Date: 2014-07-15
    Description: An investigation has been made in the NACA Lewis icing research tunnel to determine the aerodynamic and icing characteristics of a full-scale induction-system air-scoop assembly incorporating a flush alternate inlet. The flush inlet was located immediately downstream of the offset ram inlet and included a 180 deg reversal and a 90 deg elbow in the ducting between inlet and carburetor top deck. The model also had a preheat-air inlet. The investigation was made over a range of mass-air- flow ratios of 0 to 0.8, angles of attack of 0 and 4 deg airspeeds of 150 to 270 miles per hour, air temperatures of 0 and 25 F various liquid-water contents, and droplet sizes. The ram inlet gave good pressure recovery in both clear air and icing but rapid blockage of the top-deck screen occurred during icing. The flush alternate inlet had poor pressure recovery in both clear air and icing. The greatest decreases in the alternate-inlet pressure recovery were obtained at icing conditions of low air temperature and high liquid-water content. No serious screen icing was observed with the alternate inlet. Pressure and temperature distributions on the carburetor top deck were determined using the preheat-air supply with the preheat- and alternate-inlet doors in various positions. No screen icing occurred when the preheat-air system was operated in combination with alternate-inlet air flow.
    Keywords: AERODYNAMICS
    Type: NACA-RM-E53E07
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  • 7
    Publication Date: 2019-05-23
    Description: Drag measurements at low lift of four-nacelle aircraft configuration with longitudinal distribution of cross-sectional area conducive to low transonic drag rise
    Keywords: AERODYNAMICS
    Type: NACA-RM-L53E29
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  • 8
    facet.materialart.
    Unknown
    In:  Zoologische Mededelingen (0024-0672) vol.32 (1953) nr.18 p.203
    Publication Date: 2013-03-01
    Description: COPROMORPHIDAE Meyrick, 1905, Journ. Bombay Nat. Hist. Soc, vol. 16, p. 606. This small family represents a natural group with clearly marked characters, and is easy of descrimination. It inhabits tropical regions of Asia and extends through the Papuan region over the whole Pacific. The last mentioned region might be the country of origin of this group, as genera with peculiar and possibly archaic characters have been recorded from the Pacific Islands; some of those species are distinguished by an exceptionally large size. One of the interesting points with regard to the family is its possible place in the system. The long-ciliate or pectinate antennae, the neuration, and the complicated genital apparatus of the male seem to indicate an affinity with the Tineoidea. The general facies, however, is divergent to some extent, while the presence of a cubital pecten on the hind wings fundamentally discriminates this family from all the Tineoidea sensu stricto. When describing the family, Meyrick suggested that the cubital pecten might point towards an affinity with the Tortricoidea ; this relation, however, is not supported by any other characters. He further surmised that the Copromorphidae would be nearest allied to the Xyloryctidae ; in my opinion this surmise is devoid of any ground. Later Meyrick tried to combine with the Copromorphidae two other groups of "Tineina" that also are in possession of a cubital pecten, viz., the family Orneodidae, and the genus Hypertropha Meyr. The relation of the former with the Copromorphidae, however, is problematic, and deserves further proofs, while Hypertropha has in my opinion nothing in common with the family concerned, except for the
    Keywords: 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 9
    Publication Date: 2013-03-01
    Description: Contents ι. Introduction..............I 2. Systematics (a, The correct name of the genus p. 4; b, Diagnostic characters of the species and subspecies p. 6; c, Abbreviations p. 9; d, Key to the species and subspecies p. 10; e, Survey of the species and subspecies p. 11; f, Disregarded specimens p. 30; g, Wilcoxon tests for the difference between certain measurements in allied subspecies p. 31; h, Early stages p. 36; i, The species concept in Nyctalemon p. 37).......... 3. Biology............... 38 4. Distribution.............. 43 5. Evolution............... 46 6. Bibliography.............. 52 1. INTRODUCTION In November 1949 the late Professor Dr. L. J. Toxopeus of Bandung, Java, sent me a specimen of Nyctalemon for identification, but neither with the help of our collection, nor with the current literature did I succeed in ascertaining the correct name of this insect. On the contrary it appeared that, though the described forms of this genus clearly were of different value, viz., partly good species, partly geographical subspecies representing these species in restricted areas, no satisfactory division of the genus into species and subspecies had been given. Thus, Seitz' classification of the known forms into four species of which three are polytypic proved to make no sense. Therefore I resolved to study the genus more closely. In the ensuing correspondence Toxopeus gave me the benefit of his experience by providing references to relevant literature and quotations from
    Keywords: 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 10
    facet.materialart.
    Unknown
    In:  Zoologische Mededelingen (0024-0672) vol.32 (1953) nr.9 p.87
    Publication Date: 2013-03-01
    Description: I have to thank Dr. H. C. Blöte of the Leiden Museum of Natural History for his kindness to entrust me with a number of Carabidae from Indonesia for identification. A few species appear to be new to science; the descriptions follow below. One genus, Horniulus Jedl., is new to the whole of the Malay Archipelago, and another, Bembidion Latr., is new to Sumatra. Of the latter genus there are already a couple of species known from Java. I am much obliged to Mr. E. B. Britton of the British Museum, who carefully compared a few species with specimens in the collections of the British Museum and in Andrewes' collections. The type specimens are in the Leiden Museum. Oxygnathopsis gen. nov. (fig. 1 f) (Andrewes (1938, p. 196) described Oxygnathus javanus upon a single specimen from Java. With regard to the proper genus Andrewes was not absolutely sure because of a number of important differences, but before introducing a new genus he preferred to wait till more material was available. In the sending of the Leiden Museum I found a second specimen, which shows the same characteristics as the specimen described by Andrewes, so that in my opinion a new genus is desirable. The two genera are to be distinguished as follows: 1 (2) Head with the clypeus bisetose, two setae on each side over the eyes, facial carinae and sulci present; prothorax with two lateral setae on each side. Range: Assam and Burma.........Oxygnathus Dej. 2 (1) Clypeus without setae, one supra-orbital seta, the front seta is wanting, no facial Fig. 1. a, Coptodera flavipes sp. n., left elytron; b, Horniulus quadrimaculatus sp. n.,
    Keywords: 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 11
    facet.materialart.
    Unknown
    In:  Zoologische Mededelingen (0024-0672) vol.32 (1953) nr.6 p.49
    Publication Date: 2013-03-01
    Description: I. Attacus dohertyi dammermani nov. subspec. (Plate II) Large, apex of fore wing moderately produced, general coloration of wings, head, notum including patagia, and abdomen rather light reddish brown, several intersegmental folds between the abdominal tergites blackish. In both wings the terminal area somewhat lighter, more yellowish brown, in apex of fore wing grading into yellowish. Hind wing with the apical area markedly reddish. In fore wing the dark apical spot and red dash weak, submarginal line practically wanting, in hind wing a somewhat undulating submarginal dark line well developed. Postmedian band in both wings strongly serrate, but not bent inwards. Antemedian band in both wings less distinct, not serrate, in fore wing angled on base of v2, in hind wing curved inwards. The vitreous patches in both wings very large, guttiform by having the base curved outwards, the basal angles rounded, and the top elongated and pointed towards the postmedian band. In both wings with two additional vitreous patches which are in fore wing slightly larger than in hind wing. In hind wing the lower patch communicates with the interior black border of the postmedian band. All these spots bordered by a black margin. The interior orange yellow border, so obvious in many dohertyi specimens, is wanting or indicated by some inconspicuous traces only. Underside corresponding with upperside, the outer half very light, as in atlas, but the subterminal markings in both wings practically wanting or obsolete. Lateral markings of abdomen much less developed than in atlas. I ♀, 25 cm, holotype, W. Sumba, IV. 1925, labelled Dammerman, Sumba Exp., in Museum Leiden. 2. THE SPECIES OF THE GENUS Attacus L. IN THE FAR EAST.
    Keywords: 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 12
    facet.materialart.
    Unknown
    In:  Zoologische Mededelingen (0024-0672) vol.32 (1953) nr.3 p.31
    Publication Date: 2013-03-01
    Description: Eine Bestimmungssendung des Deutschen Entomologischen Institutes veranlasste mich, die Systematik der asiatischen Coenochilus zu studieren. Die Museen Leiden, Berlin und München und die Herren Frey, Haberäcker, Klapperich und van Nidek stellten mir ihr Material zur Verfügung; Herr Reichert des Museums Dresden und Herr Ruter des Museums Paris gaben bereitwillig Auskunft über Typen ihrer Museen. Ihnen alien sowie den Herren Prof. Dr. Sachtleben, Prof. Dr. Delkeskamp, Dr. C. de Jong, Dr. H. C. Blöte, Dr. Forster, H. Freude, P. Müller und St. von Breuning danke ich bestens für ihre Hilfe. Als Ergebnis meiner Studien veröffentliche ich hier die Beschreibung zweier neuer Arten und des ♂ von C. leopoldi Bourg. sowie eine aus der Arrow'schen Tabelle in der Fauna of British India weiterentwickelte Bestimmungstabelle aller asiatischen Arten. 1. Der Katalog von Junk-Schenkling Pars 72 aus 1921 ist auf Seite 366 f. durch folgende Arten zu ergänzen: assmuthi Wasmann, Wiener Ent. Zeit., vol. 37, 1918, S. 19. bifoveolatus Fairmaire, Ann. Soc. Ent. Fr., 1888, S. 344. leopoldi Bourgoin, Mem. Mus. Roy. H.N. Belg., 1933, Voyage Leopold, vol. IV fasc. 9, Col. II, S. 31. leveillei Nonfried, Berl. Ent. Zeit., 1891, S. 372, der nach Arrow kein Pilinurgus ist. obesus Wasmann, Wiener Ent. Zeit., vol. 37, 1918, S. 21. obscurus Westwood, Tijdsch. v. Ent., vol. 26, 1883, S. 62-65. platycerus Gerstäcker, von S. 368 des Kat. (1883). sumatranus Westwood, Tijdsch. v. Ent., vol. 26, 1883, S. 62-65. uncinatipes Moser, D. Ent. Zeit., 1915, S. 596.
    Keywords: 42.75
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 13
    facet.materialart.
    Unknown
    In:  Zoologische Mededelingen (0024-0672) vol.32 (1953) nr.5 p.43
    Publication Date: 2013-03-01
    Description: Some time ago I was asked to identify a fossil coleopteron which had been found in the drill cuttings of an oil well in the Southern part of Sumatra. As the fossil is only a few millimetres long it may be mentioned as an amazing fact that so small an object has been found during rather rough work like oil drilling. The details of the locality as given by Mr. A. Wright Jr. of the N.V. Standard-Vacuum Petroleum Maatschappij are as follows: "The well is one of our Kaja wells, a wildcat well located 3.3 kilometres N. 300 E. from the northeast edge of the Djirah oilfield. The drill cutting was obtained from a depth of 1930 feet subsea. Although, in drill cuttings, there is a certain measure of uncertainty as to the exact level of derivation, we have sufficient evidence to be sure that the fossil actually derives from this depth. The age is Tertiary-e; it occurs below beds of Baturadja stage age, but 200 feet above a lepidocyclina-bearing horizon. The fossil occurs in a shale interval of a formation which is generally non-fossiliferous; conditions were presumably marine, but either oligotrophe or toxic; the water at the time of deposition was shallow." The fossil is pyritized, dark bronze-greyish in colour. It is nearly free from substrate, though in some crevices a light grey, rather soft, somewhat fattish substance is found which can be taken away rather easily. The fossil was sent to the Rijksmuseum van Natuurlijke Historie at Leiden, mounted in a small box on a slide, pasted to the bottom with tragacanth. During the studies it was left in the small box, and kept in an exsiccator to preserve the fossil against deterioration by atmospheric influence.
    Keywords: 42.75
    Repository Name: National Museum of Natural History, Netherlands
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