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  Partner: UNT Libraries Government Documents Department
 Collection: Technical Report Archive and Image Library
Systematic model researches on the stability limits of the DVL series of float designs

Systematic model researches on the stability limits of the DVL series of float designs

Date: January 1, 1949
Creator: Sottorf, W.
Description: To determine the trim range in which a seaplane can take off without porpoising, stability tests were made of a Plexiglas model, composed of float, wing, and tailplane, which corresponded to a full-size research airplane. The model and full-size stability limits are in good agreement. After all structural parts pertaining to the air frame were removed gradually, the aerodynamic forces replaced by weight forces, and the moment of inertia and position of the center of gravity changed, no marked change of limits of the stable zone was noticeable. The latter, therefore, is for practical purposes affected only by hydrodynamic phenomena. The stability limits of the DVL family of floats were determined by a systematic investigation independent of any particular sea-plane design, thus a seaplane may be designed to give a run free from porpoising.
Contributing Partner: UNT Libraries Government Documents Department
A systematic study of the effects of leading-edge chord-extensions on the low-speed longitudinal stability characteristics of three 45 degree sweptback wings

A systematic study of the effects of leading-edge chord-extensions on the low-speed longitudinal stability characteristics of three 45 degree sweptback wings

Date: October 27, 1955
Creator: Kelly, H Neale
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Systematic two-dimensional cascade tests of NACA 65-series compressor blades at low speeds

Systematic two-dimensional cascade tests of NACA 65-series compressor blades at low speeds

Date: January 1, 1958
Creator: Emery, James C; Herrig, L Joseph; Erwin, John R & Felix, A Richard
Description: The performance of NACA 65-series compressor blade section in cascade has been investigated systematically in a low-speed cascade tunnel. Porous test-section side walls and for high-pressure-rise conditions, porous flexible end walls were employed to establish conditions closely simulating two-dimensional flow. Blade sections of design lift coefficients from 0 to 2.7 were tested over the usable angle-of-attack range for various combinations of inlet-flow angle. A sufficient number of combinations were tested to permit interpolation and extrapolation of the data to all conditions within the usual range of application. The results of this investigation indicate a continuous variation of blade-section performance as the major cascade parameters, blade camber, inlet angle, and solidity were varied over the test range. Summary curves of the results have been prepared to enable compressor designers to select the proper blade camber and angle of attack when the compressor velocity diagram and desired solidity have been determined.
Contributing Partner: UNT Libraries Government Documents Department
Systematic two-dimensional cascade tests of NACA 65-series compressor blades at low speeds

Systematic two-dimensional cascade tests of NACA 65-series compressor blades at low speeds

Date: February 1, 1957
Creator: Herrig, L Joseph; Emery, James C & Erwin, John R
Description: A two-dimensional low-speed porous-wall cascade tunnel investigation has been conducted to establish the performance of the NACA 65-series compressor blade sections over the useful range of inlet angle, solidity, and section camber. Design points for optimum high-speed operation are presented. The loading limitation is determined for some conditions. Trends of section operating range with increasing section camber are determined for the four inlet angles tested.
Contributing Partner: UNT Libraries Government Documents Department
Systematic Two-Dimensional Cascade Tests of NACA 65-Series Compressor Blades at Low Speeds

Systematic Two-Dimensional Cascade Tests of NACA 65-Series Compressor Blades at Low Speeds

Date: September 14, 1951
Creator: Herrig, L Joseph; Emery, James C & Erwin, John R
Description: The performance of NACA 65-series compressor blade sections in cascade has been investigated systematically in a low-speed cascade tunnel.
Contributing Partner: UNT Libraries Government Documents Department
Systematic wind-tunnel measurements on a laminar wing with nose flap

Systematic wind-tunnel measurements on a laminar wing with nose flap

Date: April 1, 1947
Creator: Krueger, W.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Systematic Wind-Tunnel Measurements on Missiles

Systematic Wind-Tunnel Measurements on Missiles

Date: March 1, 1947
Creator: Walchner, O.
Description: Wind-tunnel measurements on projectiles are discussed. Tests at the Gottingen Tunnel are described. The tunnel operates on the Prandtl principle, that is, a brief stationary air stream produced in an evacuated tank by induction of atmospheric air.
Contributing Partner: UNT Libraries Government Documents Department
Systems of Electrical Units

Systems of Electrical Units

Date: August 1963
Creator: Silsbee, Francis B.
Description: Report issued by the U.S. National Bureau of Standards discussing different systems of electrical units. As stated in the introduction, "the various systems of measurement, with their respective sets of units, used in the literature on electricity and magnetism are described in detail" (p. 1). This report includes tables.
Contributing Partner: UNT Libraries Government Documents Department
Systems of Electrical Units

Systems of Electrical Units

Date: September 20, 1962
Creator: Silsbee, Francis B.
Description: Report describing the various systems of measurement used in the literature on electricity and magnetism, with respect to their units. Their historical development is summarized. The manner in which each is derived from either of the two alternative points of view of the experimentalist and the theoretician is compared and contrasted. Tables are included for the conversion of equations and numerical values from one system to another.
Contributing Partner: UNT Libraries Government Documents Department
Table and Mollier chart for ammonia below -60° F

Table and Mollier chart for ammonia below -60° F

Date: November 1, 1948
Creator: Meyers, Cyril H.
Description: A report containing a table and Mollier chart for ammonia below -60° F.
Contributing Partner: UNT Libraries Government Documents Department