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 Decade: 1940-1949
 Year: 1947
 Month: July
 Collection: National Advisory Committee for Aeronautics Collection
Abstracts pertaining to seaplanes

Abstracts pertaining to seaplanes

Date: July 24, 1947
Creator: Bidwell, Jerold M
Description: About 400 references pertaining to the hydrodynamic design of seaplanes have been compiled, and the information is presented in the form of abstracts classified under six main headings.
Contributing Partner: UNT Libraries Government Documents Department
Analytical Treatment of Normal Condensation Shock

Analytical Treatment of Normal Condensation Shock

Date: July 1, 1947
Creator: Heybey
Description: The condensation of water vapor in an air consequences: acquisition of heat (liberated heat vaporization; loss of mass on the part of the flowing gas (water vapor is converted to liquid); change in the specific gas constants and of the ratio k of the specific heats (caused by change of gas composition). A discontinuous change of state is therefore connected with the condensation; schlieren photographs of supersonic flows in two-dimensional Laval nozzles show two intersecting oblique shock fronts that in the case of high humidities may merge near the point of intersection into one normal shock front.
Contributing Partner: UNT Libraries Government Documents Department
An approximate method for calculating the effect of surface roughness on the drag of an airplane

An approximate method for calculating the effect of surface roughness on the drag of an airplane

Date: July 23, 1947
Creator: Hall, Charles F
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Calculation of the Pressure Distribution on Bodies of Revolution in the Subsonic Flow of a Gas, Part 1, Axially Symmetrical Flow

Calculation of the Pressure Distribution on Bodies of Revolution in the Subsonic Flow of a Gas, Part 1, Axially Symmetrical Flow

Date: July 1, 1947
Creator: Bilharz, Herbert
Description: The present report concerns a method of computing the velocity and pressure distributions on bodies of revolution in axially symmetrical flow in the subsonic range. The differential equation for the velocity potential Phi of a compressible fluid motion is linearized tn the conventional manner, and then put in the form Delta(Phi) = 0 by affine transformation. The quantity Phi represents the velocity potential of a fictitious incompressible flow, for which a constant superposition of sources by sections is secured by a method patterned after von Karman which must comply with the boundary condition delta(phi)/delta(n) = 0 at the originally specified contour. This requirement yields for the "pseudo-stream function" psi a differential equation which must be fulfilled for as many points on the contour as source lengths are assumed. In this manner, the problem of defining the still unknown source intensities is reduced to the solution of an inhomogeneous equation system. The pressure distribution is then determined with the aid of Bernoulli's equation and adiabatic equation of state. Lastly, the pressure distributions in compressible and incompressible medium are compared on a model problem.
Contributing Partner: UNT Libraries Government Documents Department
Charts for the determination of supersonic air flow against inclined planes and axially symmetric cones

Charts for the determination of supersonic air flow against inclined planes and axially symmetric cones

Date: July 1, 1947
Creator: Moeckel, W E
Description: None
Contributing Partner: UNT Libraries Government Documents Department
A comparative study of weights and sizes of flat-plate exhaust-gas-to-air heat exchangers with and without fins

A comparative study of weights and sizes of flat-plate exhaust-gas-to-air heat exchangers with and without fins

Date: July 1, 1947
Creator: Tendeland, Thorval
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Comparison between the measured and theoretical span loadings on a moderately swept-forward and a moderately swept-back semispan wing

Comparison between the measured and theoretical span loadings on a moderately swept-forward and a moderately swept-back semispan wing

Date: July 1, 1947
Creator: Mendelsohn, Robert A
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Comparison of sound emission from two-blade, four-blade, and seven-blade propellers

Comparison of sound emission from two-blade, four-blade, and seven-blade propellers

Date: July 1, 1947
Creator: Hicks, Chester W
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Comparisons of theoretical and experimental lift and pressure distributions on airfoils in cascade

Comparisons of theoretical and experimental lift and pressure distributions on airfoils in cascade

Date: July 1, 1947
Creator: Katzoff, S
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Correlation of experimental and calculated effects of product of inertia on lateral stability

Correlation of experimental and calculated effects of product of inertia on lateral stability

Date: July 1, 1947
Creator: Mckinney, Marion O , Jr
Description: None
Contributing Partner: UNT Libraries Government Documents Department
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