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  • Insekten  (19)
  • Aircraft Stability and Control  (17)
  • Niederschlag  (9)
  • AERODYNAMICS  (8)
  • Polymer and Materials Science
  • 1940-1944  (51)
Collection
Keywords
Years
Year
  • 1
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    Die Beziehungen zwischen dem Lebensraum und Lebensäußerungen von Insekten (1944)
    In:  Anz. Schädl.kunde 20: 16ff
    Details
    Publication Date: 1944
    Description: Beziehung zwischen Klima und Insektenbiologie KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Deutschland, teilw. einzelne Regionen ; 1936-1941 ; Insekten ; Luftfeuchte ; Forst ; Klima ; Niederschlag ; Pflanzenschädling ; Temperatur
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  • 2
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    Massenhaftes Auftreten der Großen Buchenblatt-Gallmücke (1942)
    In:  Schweiz Ztschr. Forstwes. 93: 330-332
    Details
    Publication Date: 1942
    Description: Beschreibung über das außergewöhnliche Massenauftreten der Buchenblattgallmücke im Kanton Glaurus, fast jedes Blatt war befallen, bereits am 1. August war große Zahl der Blätter dürr KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Schweiz ; 1942 ; Insekten ; Buche ; Pflanzenschädling
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  • 3
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    Zur Biologie von Dendrolimus pini L. (Lep., Lasiocampidae) (1944)
    In:  Ann. ent. fenn. 10: 181-183
    Details
    Publication Date: 1944
    Description: Beschreibung des Überwinterungsverhaltens des Kiefernspinners KATASTER-BESCHREIBUNG: Zusammenhang zwischen geografischer Breite, Temperatur und dem Überwinterungsverhalten des Kiefernspinners KATASTER-DETAIL: Delta T-, dann zweimaliges Überwintern der Larven bei Versuchen in Finnland
    Keywords: Finnland ; 1940-44 ; Insekten ; Kiefer ; Pflanzenschädling ; Temperatur
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  • 4
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    Die Flugzeit der Nonne in Sachsen in den Jahren 1937 - 1942 (1942)
    In:  Tharandter forst. Jahrb. 93: 681-687
    Details
    Publication Date: 1942
    Description: Auswertung der in Sachsen durchgeführten Anlockversuche und des Abfaltens über die Biologie der Nonne KATASTER-BESCHREIBUNG: Verschiebung der Hauptflugzeit des Falters, Unterschiede um bis 10-20 Tage feststellbar KATASTER-DETAIL:
    Keywords: Sachsen ; 1937-1942 ; Insekten ; Forst ; Pflanzenschädling
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  • 5
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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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  • 6
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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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  • 7
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    Untersuchungen über Buschhornblattwespen (Diprion) (1942)
    In:  Ztschr. angew. Ent. 29: 412-441 u. 601-635
    Details
    Publication Date: 1942
    Description: Beschreibung der Biologie der Buschhornblattwespe vom Schlüpfen, über die Entwicklung bis hin zum Überliegen und die abiotischen Sterlichkeitsursachen, u.a. witterungsbedingt KATASTER-BESCHREIBUNG: Beginn der Frühjahrsgeneration ist klima- und wetterbedingt, unter günstigen Bedingungen (milder Winter) bereits im Januar Beginn der Entwicklung und Schlupfbeginn ab Anfang April KATASTER-DETAIL: Tmit- (Spätfrühjahr und Frühwinterwitterung) , dann Schlupfbeginn später und Anteil der Überlieger höher
    Keywords: Mecklenburg-Vorpommern ; 1937-1940 ; Insekten ; Kiefer ; Pflanzenschädling ; Temperatur ; Vegetationsperiode ; Wachstum ; Witterung
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  • 8
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    Bekämpfung und Prognose der Kiefernschonungs-Gespinstblattwespe, Acantholyda erythrocephala L. (1941)
    In:  Forstarchiv 17: 57-61
    Details
    Publication Date: 1941
    Description: Beobachtungen über das vermehrte Auftreten der Kiefernschonungs-Gespinstblattwespe KATASTER-BESCHREIBUNG: Durch Massenvermehrung der Kiefernschonungs-Gespinstblattwespe und Fraß an Nadeln des Maitriebes bei Kieferen kommt es zum Absterben der Bäume, vorwiegend auf Kuppen und sandigen Standorten, weniger in Mulden und Senken KATASTER-DETAIL: Massenauftreten der Kiefernschonungs-Gespinstblattwespe führte bis 1939 zu Absterben von mindestens 5% der Kiefernbestände, nach 1940 noch höhere Schäden
    Keywords: Mecklenburg-Vorpommern ; 1920-40 ; Insekten ; Kiefer ; Pflanzenschädling
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  • 9
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    Untersuchungen zum Individualitätsproblem bei Forstinsekten (1941)
    In:  Mitt. Biol. Reichsanst. H. 63: 46-48
    Details
    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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  • 10
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    Massenvermehrung forstlicher Schadinsekten (1941)
    In:  Dtsch. Forstztg. 10: 307-308
    Details
    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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  • 11
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    Forstentomologische und andere Beobachtungen über das Tannensterben in Böhmen, Mähren und den Karpathenländern (1942)
    In:  Tharandter forstl. Jahrb. 93: 615-630
    Details
    Publication Date: 1942
    Description: Beobachtungen zwischen Absterben von Tannen, der Witterung und dem Auftreten von Schädlinen (Tannentriebwickler, Tannentrieblaus) KATASTER-BESCHREIBUNG: Zusammenhang zwischen Tannensterben und ungünstigen Standortbedingungen (trockene Flach- und Hügelland) KATASTER-DETAIL:
    Keywords: Böhmen, Mähren und den Karpathenländern ; 1930-1941 ; Tanne ; Niederschlag
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  • 12
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    Forstentomologische Studien an der Espe (1942)
    In:  Ann. Ent. fenn. 8: 49-71
    Details
    Publication Date: 1942
    Description: Schadinsekten und Pilze der Espe, Beschreibung und Beziehung verschiedener Insekten und Pilze an dem Vertrockungsprozess KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Finnland ; 1939-1940 ; Insekten ; Forst ; Pflanzenschädling
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  • 13
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    Bioclimatic study of the European spruce sawfly in Quebec [Gilpinia hercyniae] (1943)
    In:  Rev. canad. Biol. 2: 149-167
    Details
    Publication Date: 1943
    Description: Studien über die Schlupftermine der Europäischen Fichtenbuschhornblattwespe, Übertragbarkeit von Entwicklungstadien bei gleicher klimatischen Bedingungen KATASTER-BESCHREIBUNG: Durch Einteilung in klimatische Zonen konnte die Unterschiede in Tagen des Ausschlüpfen aus den Eiern der Fichtenbuschhornblattwespe für Kanada und die USA dargestellt werden. KATASTER-DETAIL:
    Keywords: Kanada und USA ; 1940-42 ; Insekten ; Fichte ; Pflanzenschädling ; Temperatur
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  • 14
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    Über die Populationsbewegung des Kiefernspanners (Bupalus piniarius L.) in verschiedenen Bestandstypen (1942)
    In:  Ztschr. angew. Ent. 29: 116-163
    Details
    Publication Date: 1942
    Description: Beobachtungen zur Massenvermehrung des Kiefernspanners in gleichaltrigem, umgleichaltrigem und Kiefern-Eichenbestand und der Bezug zu abiotischen Faktoren KATASTER-BESCHREIBUNG: Beziehung zwischen Kiefernspanner und belebter Umwelt, im Mischwaldbeständen ist Dynamik höher, Anteil des Wetters an der Mortalität liegt bei ca. 12% (mit sehr starken Schwankungen), stark abhängig von der Lebensbedingungen für die natürlichen Feinde des Spinners KATASTER-DETAIL:
    Keywords: Sachsen-Anhalt ; 1936-1937 ; Insekten ; Kiefer ; Pflanzenschädling
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  • 15
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    Forstentomologische Studien an einigen Laubhölzern (1942)
    In:  Ann. Ent. fenn., Helsinki, 8: 143-163
    Details
    Publication Date: 1942
    Description: Vertrockungnung der Eberesche, der Salweide durch den Befall mit Kleinschmetterlingen, bzw. Käfern und sekundär Pilzen, Bescchreibung der Prozesse und Auswirkungen KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Finnland ; 1939-40 ; Insekten ; Forst ; Pflanzenkrankheit ; Pflanzenschädling
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  • 16
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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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  • 17
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    Einflüsse abiotischer Umweltsfaktoren auf den Schwammspinner (Lymantria dispar L.) im Eistadium während der Winterdiapause. 1. Wirkung des Eises (1943)
    In:  Ztschr. ges. Forstwes. 75 (69): 105-132
    Details
    Publication Date: 1943
    Description: Untersuchungen über die Wirkung von Schnee, Eis und Kälte auf die Eigelege des Schwammspinners KATASTER-BESCHREIBUNG: Niedrige Temperaturen (Januar-März) von bis zu -11.4°C hatte keine nachhaltige Auswirkungen auf die Vitalität der Eigelege, eher waren mechanische Beschädigungen z.B. durch Abkratzen der Eigelege Ursachen für das Nichtschlüpfen der Tiere KATASTER-DETAIL:
    Keywords: Kroatien, Europa ; 1938-40 ; Insekten ; Eiche ; Pflanzenschädling ; Temperatur ; Frost
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  • 18
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    Kiefernspanner und Bodenfeuchtigkeit. mit Bemerkungen über die Kieferneule. [Bupalus piniarius, Panolis flammea] (1942)
    In:  Mitt. Forstwirtsch. u. -wiss. 13: [295]-324
    Details
    Publication Date: 1942
    Description: Zusammenhang zwischen dem Abgang von Puppen der Kieferneule und abiotischen Faktoren KATASTER-BESCHREIBUNG: Zusammenhang zwischen der Überlebensrate der Puppen der Kieferneule und der Feuchtikeit in einzelnen Monaten, Optimum der relativen Feuchte für die Entwicklung bei 91% Luftfeuchte, günstigste Puppenlager sind trockene Standorte KATASTER-DETAIL: Nied+ (Mittelfeuchte und feuchte Lagen sowie in Mischlagen im Frühjahr), dann höherer Abgang von Puppen
    Keywords: Mecklenburg-Vorpommern ; 1939-1941 ; Insekten ; Luftfeuchte ; Kiefer ; Pflanzenschädling
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  • 19
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    Agrilus ater L. als Espenschädling in Finnland (1941)
    In:  Ztschr. angew. Ent. 28: 357-365
    Details
    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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  • 20
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    Zur Lebensweise des Agrilus sexguttatus Brahm (Col. Buprest.) (1944)
    In:  Anz. Schädl.kunde 20: 13-16
    Details
    Publication Date: 1944
    Description: Beschreibung zum Befall von kanadischen Pappeln mit dem Prachtkäfer KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Rheinland-Pfalz ; 1934-1943 ; Insekten ; Forst ; Pflanzenschädling
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  • 21
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    Witterung und Obstertrag (1943)
    In:  Gartenbauwissenschaft Bd. 17, S.603-615
    Details
    Publication Date: 1943
    Description: Einfluss der Temperatur und des Niederschlages auf den Ernteertrag von Birnen und Äpfeln KATASTER-BESCHREIBUNG: Durch Berechnung von Kennziffern zu Wirkung des Sommerregens auf den Obstertrag wird die Bedeutung der Niederschläge in bestimmten Monaten des Vor- und des Erntejahres bestimmt KATASTER-DETAIL: Nied+(Oktober des Vorjahres) und Nied+ (Juli des Erntejahres), dann hohe Erträge von Äpfeln und Birnen
    Keywords: Holstein ; 1916-1935 und 1921-1941 ; Apfel ; Ertrag ; Korrelationsmethode ; Niederschlag ; Rangordnungsmethode ; Temperatur ; Birne
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  • 22
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    Zusammenhänge zwischen Jahreswitterung, Düngung und Erträgen im Dikopshofer Dauerversuch (1942)
    In:  Landwirtschaftl. Jahrbuch 68:642-686
    Details
    Publication Date: 1942
    Description: Ableitung kritischer Faktoren (Temperaturoptima und Wasserversorgung) in einzelnen Wachstumsstadien KATASTER-BESCHREIBUNG: Zusammenhang zwischen Temperaturänderung während der Blüte von Weizen und dem Ertrag KATASTER-DETAIL: Delta T + und -: Tmit von 14-15°C, Änderung um +1 K auf 16°C, aber auch Rückgang um 2K auf 13°C, dann Rückgang des Ertrages
    Keywords: Kölner Bucht ; 1907-37 ; Boden ; Ertrag ; Korrelationsmethode ; Niederschlag ; Roggen ; Temperatur ; Weizen ; Witterung ; Düngung ; Hackfrüchte
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  • 23
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    Landwirtschaftlich beachtliche Windwirkung und Windschutz in der Landwirtschaft. (1943)
    In:  Kulturtechniker, Berlin 46:19-41.
    Details
    Publication Date: 1943
    Description: Bedeutung und Wirkung des Windschutzes auf Anbauart, Fruchtfolge, Gare- und Bodenpflege, Schlageinteilung, Verdunstung, Deck-, Schutz-, Mischfrucht- und Streifenanbau KATASTER-BESCHREIBUNG: Einfluss von Windschutz auf den Ertrag KATASTER-DETAIL: Windschutz +, dann Delta T(Tag) + und Delta T(Nacht)-; Windschutz +, dann Delta Relf +; Windschutz +, dann Verdunstung -; Windschutz +, dann Bodenerosion -; Windschutz +, dann Schneeanhäufung +; angepasste Bodenbearbeitung (schollige, klumpige Bodenoberfläche), dann Wasserhaltungsfähigkeit + -〉 Windschutz +, dann Ertragserhöhung + bzw. ++ (3-400%; ++: Körnerfrüchte auf 20-25vH, Rüben, Gräser, Leguminosen; +: Sommergetreide, Hafer )
    Keywords: weltweit ; letzten100 Jahre ; Boden ; Ertrag ; Niederschlag ; Temperatur ; Verdunstung ; Wind ; Frost
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  • 24
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    Inwieweit berücksichtigt der Landwirt den Klimafaktor? (1940)
    In:  Landw. Jahrbuch 89:793-808.
    Details
    Publication Date: 1940
    Description: Allgemeiner Bericht über Anpassungen der Landwirtschaft an das Klima, wie beispielsweise extensive und intensive Landwirtschaft, Fruchtfolge, Bodenbearbeitung, Frostschadenverhütung und Düngung. KATASTER-BESCHREIBUNG: - KATASTER-DETAIL: -
    Keywords: Deutschland ; 1. Hälfte 20. Jahrhundert ; Anbautermine ; Boden ; Landwirtschaft ; Niederschlag ; Temperatur ; Verdunstung ; Wassermangel ; Düngung ; Frost ; Sonnenscheindauer
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  • 25
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    Ein Verfahren zur statistischen Untersuchung der Abhängigkeit der Ernteerträge von Standort und klimatischen Faktoren. Forschungsdienst 13:301. (1942)
    In:  Forschungsdienst 13:301.
    Details
    Publication Date: 1942
    Description: Betrachtung des Klimas (Temperatur und Niederschlag) in Dekaden und Bildung von Ertrags-, Temperatur- und Niederschlagsklassen und daraus Ableitungen über die Beziehungen Ertrag und Witterung KATASTER-BESCHREIBUNG: Einfluss der Witterung (Temperatur, Niederschlag) auf den Ertrag KATASTER-DETAIL: Delta T (März) + und Delta Nied (März) +, dann Erträge +; Delta T (April -, dann Erträge +; Delta Nied (Ende Juni,Ende Juli)-, dann Erträge + Delta T (Anfang Juli) +, dann Erträge +
    Keywords: Schlesien ; 1926-38 ; Boden ; Ertrag ; Niederschlag ; Weizen ; Witterung
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  • 26
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    Eine Darstellung der ursächlichen Wechselbeziehungen zwischen Witterungsverlauf und Bodenzustand in ihren Auswirkungen auf Pflanzenwuchs und Ernte (1942)
    In:  Klima / Boden / Ernte Verlag C.V. Engelhard, Berlin. p. 7, 114-127
    Details
    Publication Date: 1942
    Description: Beziehung zwischen Witterungsablauf und Bodenzustand und deren Auswirkung auf Pflanzenwuchs und Ernte KATASTER-BESCHREIBUNG: Einfluss der Witterung auf den Ertrag von Kartoffeln KATASTER-DETAIL: Delta T (April bis Juli) -, dann Erträge (Kartoffel) +; Delta Nied (April bis Juli) -, dann Erträge (Kartoffel) -
    Keywords: Gesamtpreußen, Deutschland,Schlesien ; 1921-1932,1934 ; Zuckerrüben ; Kartoffeln ; Ertrag ; Hafer ; Landwirtschaft ; Niederschlag ; Temperatur ; Witterung ; Hackfrüchte
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  • 27
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    Antispin-Tail-Parachute Installations (1943)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: Although antispin tail parachutes have been used successfully in spin demonstrations for some time, very little published information is available concerning the size of parachute, the bridle-line length, and the type and location of pack to use for particular airplane. The present paper is an attempt to supply data relating to these factors. The paper is in two parts. The first part reviews the principles of operation of the antispin parachutes, views the principles of operation of the antispin parachutes, summarized available information on actual installations, and discusses parachute loads and pack locations. The second part of the paper reports on systematic tests in the NACA-15-foot and 20-foot free-spinning tunnels at the Langley memorial Aeronautical Laboratory to determine the minimum size and the optimum bridle-line lengths for antispin tail parachutes for current military airplanes. It is concluded that airplanes weighing between 7500 and 14,000 pounds require parachutes 8 feet in diameter and bridle-line lengths between 20 and 50 feet. A positive-ejection mechanism is desirable to throw the parachute clear of the tail and to assure rapid opening. The pack and attachment point must be so located that the equipment will not foul the tail surfaces.
    Keywords: Aircraft Stability and Control
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 28
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    A Theoretical Investigation of Longitudinal Stability of Airplanes with Free Controls Including Effect of Friction in Control System (1944)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The relation between the elevator hinge moment parameters and the control forces for changes in forward speed and in maneuvers is shown for several values of static stability and elevator mass balance. The stability of the short period oscillations is shown as a series of boundaries giving the limits of the stable regions in terms of the elevator hinge moment parameters. The effects of static stability, elevator moment of inertia, elevator mass unbalance, and airplane density are also considered. Dynamic instability is likely to occur if there is mass unbalance of the elevator control system combined with a small restoring tendency (high aerodynamic balance). This instability can be prevented by a rearrangement of the unbalancing weights which, however, involves an increase of the amount of weight necessary. It can also be prevented by the addition of viscous friction to the elevator control system provided the airplane center of gravity is not behind a certain critical position. For high values of the density parameter, which correspond to high altitudes of flight, the addition of moderate amounts of viscous friction may be destabilizing even when the airplane is statically stable. In this case, increasing the viscous friction makes the oscillation stable again. The condition in which viscous friction causes dynamic instability of a statically stable airplane is limited to a definite range of hinge moment parameters. It is shown that, when viscous friction causes increasing oscillations, solid friction will produce steady oscillations having an amplitude proportional to the amount of friction.
    Keywords: Aircraft Stability and Control
    Type: AD-A301267 , NACA-TR-791
    Format: application/pdf
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  • 29
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    Control-Surface Instability on High-Speed Airplanes (1942)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: Tests of several modern airplanes indicate that control surfaces with a high degree of aerodynamic balance are likely to possess characteristics which make them unsatisfactory or dangerous in high-speed flight. Dive tests made in the spring of 1940 at the NACA on a naval fighter-type airplane illustrate one form of instability that may be encountered. During a dive at an indicated airspeed of 365 miles per hour, the ailerons suddenly overbalanced. The efforts of the pilot to bring the ailerons back to neutral resulted in a violent oscillation of the control stick from side to side. Fortunately, the force required to return the ailerons to neutral was within the pilot's capabilities. A time history of the maneuver is given in figure1 and typical frames from motion pictures of the cockpit and of the wing, taken during the maneuver, are given in figure 2. In the illustrated case, the occurrence of aerodynamic overbalance was attributed to a slight bulge, approximately 1/16 inch thick, on the lower surface of the leading edges of the ailerons, caused by the installation of additional mass balance ahead of the hinge line. A drawing showing the shape of the bulge is given in figure 3. After this slight protuberance had been eliminated, dives were successfully made at higher speeds.
    Keywords: Aircraft Stability and Control
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  • 30
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    Wind Tunnel Investigation of the Effect of Jet-Motor Operation Stability (1944)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The effects of jet-motor operation on the stability and control characteristics of two fighter-type airplanes as determined by wind-tunnel tests of 1/5-scale models are presented. It is shown that the action of the jets is to cause a small loss in stick-fixed stability which is predictable from known theories.
    Keywords: Aircraft Stability and Control
    Type: NACA-WR-A-31
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  • 31
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    Effects of Propeller Operation and Angle of Yaw on the Distribution of the Load on the Horizontal Tail Surface of a Typical Pursuit Airplane (1944)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: No abstract available
    Keywords: Aircraft Stability and Control
    Type: NACA-WR-L-227 , NACA-ARR-4B10
    Format: application/pdf
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  • 32
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    Wind-Tunnel Tests of the 1/9-Scale Model of the Curtiss XP-62 Airplane with Various Vertical Tail Arrangements (1943)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The effect of various vertical tail arrangements upon the stability and control characteristics of an XP-62 fighter model was investigated. Rudder-free yaw characteristics with take-off power and flaps deflected were satisfactory after dorsal fin modifications. Directional stability was obtained with all modified vertical tails. Satisfactory rudder effectiveness resulted partly because the dual-rotation propellers produced no asymmetric yawing moments. Pedal forces in sideslips were undesirably large but may be easily reduced.
    Keywords: Aircraft Stability and Control
    Type: NACA-WR-L-779
    Format: application/pdf
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  • 33
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    Investigation of Diving Moments of a Pursuit Airplane in the Ames 16-Foot High Speed Wind Tunnel (1942)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A pursuit type airplane encountered severe diving moments in high-speed dives which make recovery difficult. For the purpose of investigating these diving moments and finding means for their reduction, a 1/6-scale model of the airplane was tested in the 16-foot high-speed wind tunnel at Ames Aeronautical Laboratory. The test results indicate that up to a Mach number of at least 0.75, the limit of the tests, the dive-recovery difficulties can be alleviated and the longitudinal maneuverability improved by the substitution of a long symmetrical fuselage for the standard fuselage.
    Keywords: Aircraft Stability and Control
    Type: NACA-WR-A-65
    Format: application/pdf
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  • 34
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    Flight Tests of the Wilford XOZ-1 Sea Gyroplane (1941)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: During August 1939 a series of flight tests was made at Langley Field on the Wilford sea gyroplane, designated by the Navy as the XOZ-1. These tests were intended to permit rough evaluation of the stability and control characteristics of the machine, with particular reference to possible improvements in rigging which might be made in future machines with fixed wing and nonarticulated feathering control rotor, and to provide data on the bending and feathering motions of the rotor blades. The tests made in 1939 proved inadequate, chiefly because the machine as flown did not have sufficient propeller thrust to give it an appreciable speed range in steady flight. Further tests were therefore made in August 1940 after overhauling the engine and substituting a metal propeller for the wooded one first used. The range of speeds covered in steady flight was markedly extended. Steady-flight runs only were made in this series, since it was felt that takeoffs and landings had been covered sufficiently in the previous tests.
    Keywords: Aircraft Stability and Control
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  • 35
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    Investigation of the behavior of parallel two-dimensional air jets (1944)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Keywords: AERODYNAMICS
    Type: NASA-TM-101182 , NACA-ACR-4H24 , NAS 1.15:101182
    Format: application/pdf
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  • 36
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    Notes on the effect of surface distortions on the drag and critical Mach number of airfoils (1943)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Keywords: AERODYNAMICS
    Type: NACA-ACR-3129 , NASA-TM-79962
    Format: application/pdf
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  • 37
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    Tests of a heated low-drag airfoil (1942)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Keywords: AERODYNAMICS
    Type: NACA-ACR-244
    Format: application/pdf
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  • 38
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    Wind-tunnel investigation of several factors affecting the performance of a high-speed pursuit airplane with air-cooled radial engine (1941)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Keywords: AERODYNAMICS
    Type: NACA-SR-211
    Format: application/pdf
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  • 39
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    Flight investigation of boundary-layer control by suction slots on an NACA 35-215 low-drag airfoil at high Reynolds numbers (1944)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Keywords: AERODYNAMICS
    Type: NASA-TM-79834 , NACA-ACR-4B29 , L-521
    Format: application/pdf
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  • 40
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    Flight tests of the high-speed performance of a P-51B airplane (AAF no. 43-12105) (1944)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Keywords: AERODYNAMICS
    Type: NASA-TM-79875 , NACA-MR-L4L18
    Format: application/pdf
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  • 41
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    Investigation of effects of various camouflage paints and painting procedures on the drag characteristics of an NACA 65 sub (421), sup -420, A = 1.0 airfoil section (1944)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Keywords: AERODYNAMICS
    Type: NASA-TM-79829 , NACA-CB-L4G17 , L-141
    Format: application/pdf
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  • 42
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    Profile-drag coefficients of conventional and low-drag airfoils as obtained in flight (1944)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Keywords: AERODYNAMICS
    Type: NASA-TM-79837 , NACA-ACR-L4E31 , L-139
    Format: application/pdf
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  • 43
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    Wind-Tunnel Procedure for Determination of Critical Stability and Control Characteristics of Airplanes (1944)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: This report outlines the flight conditions that are usually critical in determining the design of components of an airplane which affect its stability and control characteristics. The wind-tunnel tests necessary to determine the pertinent data for these conditions are indicated, and the methods of computation used to translate these data into characteristics which define the flying qualities of the airplane are illustrated.
    Keywords: Aircraft Stability and Control
    Type: NACA/TR-781
    Format: application/pdf
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  • 44
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    An Interim Report on the Stability and Control of Tailless Airplanes (1944)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: Problems relating to the stability and control of tailless airplanes are discussed in consideration of contemporary experience and practice.
    Keywords: Aircraft Stability and Control
    Type: NACA/TR-796
    Format: application/pdf
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  • 45
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    Flight Studies of the Horizontal-Tail Loads Experienced by a Fighter Airplane in Abrupt Maneuvers (1944)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: Field measurements were made on a fighter airplane to determine the approximate magnitude of the horizontal tail loads in accelerated flight. In these flight measurements, pressures at a few points were used as an index of the tail loads by correlating these pressures with complete pressure-distribution data obtained in the NACA full-scale tunnel. In addition, strain gages and motion pictures of tail deflections were used to explore the general nature and order of magnitude of fluctuating tail loads in accelerated stalls.
    Keywords: Aircraft Stability and Control
    Type: NACA/TR-792
    Format: application/pdf
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  • 46
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    A Theoretical Investigation of Longitudinal Stability of Airplane with Free Controls Including Effect of Friction in Control System (1944)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The relation between the elevator hinge-moment parameters and the control-forces for changes in forward speed and in maneuvers is shown for several values of static stability and elevator mass balance.
    Keywords: Aircraft Stability and Control
    Type: NACA/TR-791
    Format: application/pdf
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  • 47
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    Determination of the Stresses Produced by the Landing Impact in the Bulkheads of a Seaplane Bottom (1944)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: The present report deals with the determination of the impact stresses in the bulkhead floors of a seaplane bottom. The dynamic problem is solved on the assumption of a certain elastic system, the floor being assumed as a weightless elastic beam with concentrated masses at the ends (due to the mass of the float) and with a spring which replaces the elastic action of the keel in the center. The distributed load on the floor is that due to the hydrodynamic force acting over a certain portion of the bottom. The pressure distribution over the width of the float is assumed to follow the Wagner law. The formulas given for the maximum bending moment are derived on the assumption that the keel is relatively elastic, in which case it can be shown that at each instant of time the maximum bending moment is at the point of juncture of the floor with the keel. The bending moment at this point is a function of the half width of the wetted surface c and reaches its maximum value when c is approximately equal to b/2 where b is the half width of the float. In general, however, for computing the bending moment the values of the bending moment at the keel for certain values of c are determined and a curve is drawn. The illustrative sample computation gave for the stresses a result approximately equal to that obtained by the conventional factory computation.
    Keywords: Aircraft Stability and Control
    Type: NACA-TM-1055 , Report of the Central Aero-Hydrodynamical Inst., Moscow; Rept-449
    Format: application/pdf
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  • 48
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    Determination of Flight Paths of an SBD-1 Airplane in Simulated Diving Attacks, Special Report (1943)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: An investigation has been made to determine the motions of and the flight paths describe by a Navy dive-bombing airplane in simulated diving attacks. The data necessary to evaluate these items, with the exception of the atmospheric wind data, were obtained from automatic recording instruments installed entirely within the airplane. The atmospheric wind data were obtained from the ground by the balloon-theodolite method. The results of typical dives at various dive angles are presented in the form of time histories of the motion of the airplane as well as flight paths calculated with respect to still air and with respect to the ground.
    Keywords: Aircraft Stability and Control
    Type: NACA-ACR-248 , NACA-SR-248
    Format: application/pdf
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  • 49
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    Study of Turning Performance of a Fighter-Type Airplane Particularly as Affected by Flaps and Increased Supercharging, Special Report (1942)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Results of a study to determine the effects on turning performance due to various assumed modifications to a typical Naval fighter airplane are presented. The modifications considered included flaps of various types, both part and full space, increased supercharging, and increased wing loading. The calculations indicated that near the low-speed end of the speed range, the turning performance, as defined by steady level turns at a given speed, would be improved to some extent by any of the flaps considered at altitudes up to about 25,000 feet. (If turning is not restricted to the conditions of no loss of speed or altitude, more rapid turning can, of course, be accomplished with the aid of flaps, regardless of altitude.) Fowler flaps and NACA slotted flaps appeared somewhat superior to split or perforated split flaps for maneuvering purposes, particularly if the flap position is not adjustable. Similarly, better turning performance should be realized with full-span than with part-span flaps. Turning performance over the lower half of the speed range would probably not be materially improved at any altitude by increased supercharging of the engine unless the propeller were redesigned to absorb the added power more effectively; with a suitable propeller the turning performance at high altitudes could probably be greatly improved with increased supercharging. A reduction in wing area with the aspect ratio held constant would result in impairment of turning performance over practically the entire speed range at all altitudes.
    Keywords: Aircraft Stability and Control
    Type: NACA-ACR-222 , NACA-SR-222
    Format: application/pdf
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  • 50
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    Effects of Direction of Propeller Rotation on the Longitudinal Stability of the 1/10-Scale Model of the North American XB-28 Airplane with Flaps Neutral, Special Report (1942)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The effects of direction of propeller rotation on factors affecting the longitudinal stability of the XB-28 airplane were measured on a 1/10-scale model in the 7- by 10-foot tunnel of the Ames Aeronautical Laboratory. The main effect observed was that caused by regions of high downwash behind the nacelles (power off as well as power on with flaps neutral). The optimum direction of propeller rotation, both propellers rotating up toward the fuselage, shifted this region off the horizontal tail and thus removed its destabilizing effect. Rotating both propellers downward toward the fuselage moved it inboard on the tail and accentuated the effect, while rotating both propellers right hand had an intermediate result. Comparisons are made of the tail effects as measured by force tests with those predicted from the point-by-point downwash and velocity surveys in the region of the tail. These surveys in turn are compared with the results predicted from available theory.
    Keywords: Aircraft Stability and Control
    Type: NACA-ACR-224 , NACA-SR-224
    Format: application/pdf
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  • 51
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    Flight Measurements of the Aileron Characteristics of a Grumman F4F-3 Airplane (1942)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The aileron characteristics of a Grumman F4F-3 airplane were determined in flight by means of NACA recording and indicating instruments. The results show that the ailerons met NACA minimum requirements for satisfactory control throughout a limited speed range. A helix angle of approximately 0.07 radian was produced with flaps down at speeds from 90 to 115 miles per hour indicated airspeed and with flaps up from 115 to 200 miles per hour. With flaps up at 90 miles per hour, the helix angle dropped to 0.055 radian; above 200 miles per hour heavy aileron stick forces seriously restricted maneuverability in roll.
    Keywords: Aircraft Stability and Control
    Type: NACA-ACR-239 , NACA-SR-239
    Format: application/pdf
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