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Wind-Tunnel Corrections at High Subsonic Speeds Particularly for an Enclosed Circular Tunnel
A review of existing publications on wind-tunnel corrections is followed by an approximate method for determining the corrections due to model and wake displacement and to lift. Relations are investigated for fuselages and wings of various spans in closed circular tunnels. A comparison is made between the computations and the tests in the DVL high-speed wind tunnel.
Date:
February 1952
Creator:
Göthert, Bernhard Hermann
System:
The UNT Digital Library
Calculation of the Lateral-Dynamic Stability of Aircraft
"Graphs and formulas are given with the aid of which all the aerodynamic coefficients required for computing the lateral dynamic stability can be determined. A number of numerical examples are given for obtaining the stability derivatives and solving the characteristic-stability equation. Approximate formulas are derived with the aid of which rapid preliminary computations may be made and the stability coefficients corrected for certain modifications of the airplane" (p. 1).
Date:
February 1952
Creator:
Raikh, A.
System:
The UNT Digital Library
On Rotational Conical Flow
Some general properties of isoenergetic rotational conical fields are determined. For such fields, provided the physical parameters of the fluid flow are known on a conical reference surface, it being understood that they satisfy certain imposed conditions, it is shown how to construct the hodographs in the various meridional semiplanes, as the envelope of either the tangents to the hodographs or of the osculatory circles.
Date:
February 1952
Creator:
Ferrari, Carlo
System:
The UNT Digital Library
Concerning the Flow About Ring-Shaped Cowlings Part 9: The Influence of Oblique Oncoming Flow on the Incremental Velocities and Air Forces at the Front Part of Circular Cowls
The dependence of the maximum incremental velocities and air forces on a circular cowling on the mass flow and the angle of attack of the oblique flow is determined with the aid of pressure-distribution measurements. The particular cowling tested had been partially investigated in NACA TM 1327.
Date:
February 1952
Creator:
Küchemann, Dietrich & Weber, Johanna
System:
The UNT Digital Library
Concerning the Flow About Ring-Shaped Cowlings Part 8: Further Measurements on Annular Profiles
"The measurements of part V (reference 1) of this series of reports, which concerned comparatively long ring profiles, are supplemented by measurements on shorter rings as they are used for shrouded propellers and cowlings of ring-shaped radiators. Mass-flow coefficients and profile drags are given. Furthermore, it has to be determined how far the potential theory describes the flow phenomenon with sufficient accuracy and whether the present theory for the calculation of thin annular profile yields useful profile forms and is suitable for determination of the mass flow for thick profiles" (p. 1).
Date:
February 1952
Creator:
Küchemann, Dietrich & Weber, Johanna
System:
The UNT Digital Library