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Partner:
UNT Libraries Government Documents Department
Decade:
1940-1949
Month:
April
Language:
English
Serial/Series Title:
NACA Technical Notes
Collection:
Technical Report Archive and Image Library
A Simple Method of Estimating the Subsonic Lift and Damping in Roll of Sweptback Wings
Date: April 1, 1949
Creator: Polhamus, Edward C.
Description: A method of modifying existing correction factors of lifting-surface theory to account approximately for the effects of sweep was derived, and these factors were applied to existing lifting-line theories for the lift and damping in roll of swept wings. Despite the simplicity of the resulting formulas the agreement with experimental data for low speeds is very good. The equation for lift is expressed entirely in terms of the geometric characteristics of the wing and the section-lift-curve; the necessity for any charts is thereby eliminated. The equation for the damping in roll, however, requires a chart for the determination of the effective lateral center of pressure for rolling moment due to rolling. If the Glauert-Prandtl transformation is used, the formulas obtained can be applied to swept wings at subsonic speeds below the critical speed.
Contributing Partner: UNT Libraries Government Documents Department
Permallink:digital.library.unt.edu/ark:/67531/metadc53591/
Tests of a gust-alleviating wing in the gust tunnel
Date: April 1, 1941
Creator: Shufflebarger, C C
Description: Tests were made in the NACA gust tunnel to determine the effectiveness of a torsionally flexible wing with the torsion axis ahead of the locus of the section aerodynamic centers in reducing airplane accelerations due to atmospheric gusts. For three gust shapes, a series of flights was made with the airplane model equipped with either a torsionally flexible or a rigid wing. The results indicated that the torsionally flexible wing reduced the maximum acceleration increment 5 percent for the sharp-edge gust and about 17 percent for gust shapes with gradient distances of 6.8 and 15 chord lengths. The analysis indicated that the effectiveness of this method of gust alleviation was independent of the gust velocity and that, for the same total load increment, the torsionally flexible wing would have 10 percent less bending-moment increment at the root section of the wing than a rigid wing in all but the sharpest gusts. The results also indicated that the torsionally flexible wing slightly increased the longitudinal stability of the airplane model in a gust.
Contributing Partner: UNT Libraries Government Documents Department
Permallink:digital.library.unt.edu/ark:/67531/metadc53667/
Some effects of rainfall on flight of airplanes and on instrument indications
Date: April 1, 1941
Creator: Rhode, Richard V
Description: Several possible effects of heavy rain on the aerodynamic performance of an airplane and of heavy rain and associated atmospheric phenomena on the indications of flight instruments are briefly considered. It is concluded that the effects of heavy rain on the performance of an airplane are not so great as to force the airplane down from moderate altitudes. Serious malfunctioning of the air-speed indicator may occur, however, as a result of flooding of the pitot-static head and subsequent accumulation of water in the air-speed pressure line. In strong convective situations, like thunderstorms, the rate-of-climb indicator may also be seriously in error owing to rapid variations of atmospheric pressure when entering and emerging from the convection currents.
Contributing Partner: UNT Libraries Government Documents Department
Permallink:digital.library.unt.edu/ark:/67531/metadc53668/
Effect of aging on mechanical properties of aluminum-alloy rivets
Date: April 1, 1941
Creator: Roop, Frederick C
Description: Curves and tabular data present the results of strength tests made during and after 2 1/2 years of aging on rivets and rivet wire of 3/16-inch nominal diameter. The specimens were of aluminum alloy: 24S, 17S, and A17S of the duralumin type and 53S of the magnesium-silicide type.
Contributing Partner: UNT Libraries Government Documents Department
Permallink:digital.library.unt.edu/ark:/67531/metadc53669/
Wind-tunnel investigation of icing of an engine cooling-fan installation
Date: April 1, 1947
Creator: Lewis, J. P.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Permallink:digital.library.unt.edu/ark:/67531/metadc53468/
A flight investigation of the thermal performance of air heated propeller
Date: April 1, 1947
Creator: Darsow, J. F.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Permallink:digital.library.unt.edu/ark:/67531/metadc53446/
Office of Naval Research and NACA metallurgical investigation of a large forged disc of Inconel X alloy
Date: April 1, 1949
Creator: Cross, Howard C
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Permallink:digital.library.unt.edu/ark:/67531/metadc55023/
High-lift and lateral control characteristics of an NACA 652-215 semispan wing equipped with plug and retractable ailerons and a full-span slotted flap
Date: April 1, 1949
Creator: Fischel, Jack
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Permallink:digital.library.unt.edu/ark:/67531/metadc55197/
Free-space oscillating pressures near the tips of rotating propellers
Date: April 1, 1949
Creator: Hubbard, Harvey H
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Permallink:digital.library.unt.edu/ark:/67531/metadc55194/
A mathematical theory of plasticity based on the concept of slip
Date: April 1, 1949
Creator: Batdorf, S B
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Permallink:digital.library.unt.edu/ark:/67531/metadc55196/