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  • 1
    Electronic Resource
    Electronic Resource
    Feeding preferences and their modification in early and late instar larvae of the bagworm,Thyridopteryx ephemeraeformis (Lepidoptera: Psychidae) (1990)
    Springer
    Journal of insect behavior 3 (1990), S. 785-795 
    Details
    ISSN: 1572-8889
    Keywords: bagworm ; Thyridopteryx ephemeraeformis ; feeding preference ; induction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Feeding preferences in naive first instar and penultimate-final instar bagworm (Thyridopteryx ephemeraeformis)larvae were investigated using two choice tests. Naive first instar larvae showed a general (though not exclusive) preference for black willow (Salix nigra)over other hosts tested, regardless of the host of origin. Penultimate-final instar larvae showed strong preferences for the previous rearing host, suggesting induction of host preference; there was no evidence of host origin effects. The ability to discriminate among hosts is important if it is actually used to make host choices based on host quality. In bagworms, where host choices (if any) must be made by larvae in habitats where several hosts are often present, host discriminatory ability is likely important.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01065966
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Interference of Wing and Fuselage from Tests of 209 Combinations in the NACA Variable-Density Tunnel (1936)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report presents the results of tests of 209 simple wing-fuselage combinations made in the NACA variable-density wind tunnel to provide information regarding the effects of aerodynamic interference between wings and fuselages at a large value of Reynolds number.
    Type: NACA-TR-540
    Format: application/pdf
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  • 3
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    A New Method of Studying the Flow of the Water Along the Bottom of a Model of a Flying-boat Hull (1940)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A new method of studying the flow of the water along the bottom of a model of a flying-boat hull is described. In this method, the model is fitted with a transparent bottom and is divided down the center line by a bulkhead. The flow is observed and photographed through one-half of the model by means of the diffused illumination from a battery of lamps contained in the other half of the model. Photographs of the flow, particularly of the changes that occur when the step ventilates, are shown. The results of the present investigation indicate that the method has considerable promise, chiefly in connection with motion-picture studies.
    Type: NACA-TN-749
    Format: application/pdf
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  • 4
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    Hydrodynamic Tests in the N.A.C.A. Tank of a Model of the Hull of the Short Calcutta Flying Boat (1937)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The hydrodynamic characteristics of a model of the hull of the Short Calcutta (N.A.C.A. Model 47) are presented in non-dimensional form. This model represents one of a series of hulls of successful foreign and domestic flying boats the characteristics of which are being obtained under similar test conditions in the N.A.C.A. tank. The take-off distance and time for a flying boat having the hull of the Calcutta are compared at two values of the gross load with the corresponding distances and times for the same flying boat having hulls of two representative American types, the Sikorsky S-40 and the N.A.C.A. 11-A. This comparison indicates that for hulls of the widely different forms compared, the differences in take-off time and distance are negligible.
    Type: NACA-TN-590
    Format: application/pdf
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  • 5
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    Tank Tests of Models of Flying Boat Hulls Having Longitudinal Steps (1936)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Four models with longitudinal steps on the forebody were developed by modification of a model of a conventional hull and were tested in the National Advisory Committee for Aeronautics (NACA) tank. Models with longitudinal steps were found to have smaller resistance at high speed and greater resistance at low speed than the parent model that had the same afterbody but a conventional V-section forebody. The models with a single longitudinal step had better performance at hump speed and as low high-speed resistance except at very light loads. Spray strips at angles from 0 degrees to 45 degrees to the horizontal were fitted at the longitudinal steps and at the chine on one of the two step models having two longitudinal steps. The resistance and the height of the spray were less with each of the spray strips than without; the most favorable angle was found to lie between 15 degrees and 30 degrees.
    Type: NACA-TN-574
    Format: application/pdf
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  • 6
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    Characteristics of an Airfoil as Affected by Fabric Sag (1932)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report presents the results of tests made at a high value of the Reynolds Number in the N.A.C.A. variable-density wind tunnel to determine the aerodynamic characteristics of an airfoil as affected by fabric sag. Tests were made of two Gottingen 387 airfoils, one having the usual smooth surface and the other having a surface modified to simulate two types of fabric sag. The results of these tests indicate that the usual sagging of the wind covering between ribs has a very small effect on the aerodynamic characteristics of an airfoil.
    Type: NACA-TN-428
    Format: application/pdf
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  • 7
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    Interference Effects and Drag of Struts on a Monoplane Wing (1931)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Tests were conducted in the Variable Density Wind Tunnel of the NACA to determine the importance of the interference effects and drag of struts on a monoplane. Inclined struts were placed upon a Gottingen 387 airfoil in the lower surface positions and in two upper surface positions. Tests were made at values of Reynolds Number comparable with those obtained in flight. It was found that the interference drag of struts may be as great as the drag of the struts alone.
    Type: NACA-TN-365
    Format: application/pdf
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  • 8
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    Tests of N.A.C.A. airfoils in the variable-density wind tunnel Series 24 (1932)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This note is the fifth of a series covering an investigation of a number of related airfoils. It presents the results obtained from tests of a group of six low-cambered airfoils in the variable-density wind tunnel. The mean camber lines are identical for the six airfoils and are of such a form that the maximum mean camber is 2 per cent of the chord and is at a position 0.4 of the chord behind the loading edge. The airfoils differ in thickness only, the maximum-thickness/chord ratios being 0.06, 0.09, 0.12, 0.15, 0.18, and 0.21. The results have been presented in the form of both infinite and finite aspect-ratio characteristics. The values of C(sub L) max/C(sub d) degrees min for this group of airfoils are among the highest thus far obtained, the minimum profile drags being approximately equal to those for the symmetrical series of corresponding thickness, while the maximum lift coefficients are considerably higher.
    Type: NACA-TN-404
    Format: application/pdf
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  • 9
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    The Interference Effects on an Airfoil of a Flat Plate at Mid-span Position (1931)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report gives the results of an investigation of the mutual interference of an airfoil and a flat plate inserted at mid-span position. The tests were conducted in the Variable-Density Wind Tunnel of the National Advisory Committee for Aeronautics at a high value of the Reynolds Number. The interference effects of this combination were found to be small. Supplementary tests indicated that the use of fillets decreases both the lift and drag slightly. A bibliography of publication dealing with interference between wings and bodies, and with the effects of cut-outs and fillets is included.
    Type: NACA-TN-403
    Format: application/pdf
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  • 10
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    The effect of small variations in profile of airfoils (1931)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report deals with the effect of small variations in ordinates specified by different laboratories for the airfoil section. This study was made in connection with a more general investigation of the effect of small irregularities of the airfoil surface on the aerodynamic characteristics of an airfoil. These tests show that small changes in airfoil contours, resulting from variations in the specified ordinates, have a sufficiently large effect upon the airfoil characteristics to justify the taking of great care in the specification of ordinates for the construction of models.
    Type: NACA-TN-361
    Format: application/pdf
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