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 Collection: Technical Report Archive and Image Library
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A flight investigation of the reduction of aileron operating force by means of fixed tabs and differential linkage, with notes on linkage design

A flight investigation of the reduction of aileron operating force by means of fixed tabs and differential linkage, with notes on linkage design

Date: June 1, 1938
Creator: Soule, H A & Hootman, James A
Description: Flight tests were made to demonstrate the particularity of employing fixed tabs in conjunction with a suitably designed differential linkage to reduce the force required to operate ailerons. The tests showed the system to be practicable with tabs of the inset type. The relative ineffectiveness of attached tabs for changing the aileron floating angle rendered them unsuitable. Experience gained in the investigation has indicated that the use of the system is limited to maximum deflections of one aileron relative to the other of less than 30 degrees and that the differential linkage should always be designed on the basis of the highest probable floating angle.
Contributing Partner: UNT Libraries Government Documents Department
Fuel consumption of a carburetor engine at various speeds and torques

Fuel consumption of a carburetor engine at various speeds and torques

Date: June 1, 1938
Creator: Schey, Oscar W & Clark, J Denny
Description: An investigation was conducted to obtain fuel-consumption curves for a single-cylinder engine with a Wright 1820-G and Pratt & Whitney 1340-H cylinder at varying speeds, manifold pressures, and air-fuel ratios. The 1340- H cylinder was tested at speeds from 1,200 to 2,400 r.p.m. and at manifold pressures from 21 to 38 inches of mercury absolute. Less than extensive tests were made of the 1820-G cylinder. The results of the tests showed that the minimum brake fuel consumption was obtained when the engines were operating at high torques and at speeds from 60 to 70 percent of the rated speed. The fuel consumption increased at an increasing rate as the torque was reduced; and, at 45 percent of maximum torque, the fuel consumption was 20 percent higher than at maximum torque when the engines were operating at 70 percent of rated speed. Minimum specific fuel consumption was obtained at the same air-fuel ratio regardless of compression ratio. No improvement in fuel consumption was obtained when mixtures leaner than an air-fuel ratio of 15.5 were used. The leanest mixture ratio on which the engine with the 1340-H cylinder would operate smoothly was 18.5 and the spark advance for maximum power with this ...
Contributing Partner: UNT Libraries Government Documents Department
The Pegmatites at Tinton, South Dakota

The Pegmatites at Tinton, South Dakota

Date: June 1938
Creator: Hess, Frank L. & Bryan, Barnabas, Jr.
Description: Report issued by the U.S. Bureau of Mines on the pegmatite deposits found near Tinton, South Dakota. The properties, and geology of the deposits are presented. This report includes tables, and maps.
Contributing Partner: UNT Libraries Government Documents Department
Principles involved in the cooling of a finned and baffled cylinder

Principles involved in the cooling of a finned and baffled cylinder

Date: June 1, 1938
Creator: Brevoort, M J
Description: An analysis of the cooling problems for a finned cylinder is made on the basis of the known fundamental principles of heat transfer from pipes. Experimental results that support the analysis are presented. The results of previous investigations on the problem are evaluated on the basis of the analysis and the results. An illustration of the application of these principles to a specific problem is included.
Contributing Partner: UNT Libraries Government Documents Department
Tables of stiffness and carry-over factor for structural members under axial load

Tables of stiffness and carry-over factor for structural members under axial load

Date: June 1, 1938
Creator: Lundquist, Eugene E & Kroll, W D
Description: Tables of stiffness and carry-over factor are presented for members in which the cross section and axial load do not vary along the length of the member. These tables are of use in solving problems in the stability of structural members under axial load as well as in application of the Cross method of moment distribution when the effects of axial load in the members are considered. The interval between successive values of the argument is small enough to make interpolation unnecessary in engineering calculations.
Contributing Partner: UNT Libraries Government Documents Department
Theoretical study of various airplane motions after initial disturbance

Theoretical study of various airplane motions after initial disturbance

Date: June 1, 1938
Creator: Haus, FR
Description: The present investigation may be considered as preliminary to the study of automatic stabilizers. We have sought to determine first how an airplane of average characteristics reacts against the principal disturbances it may encounter. Without entering into the general study of automatic stabilizers, the present work suggests the idea of a stabilizer whose sensitive member would be a wind vane or pressure plate. The elements considered as variable were the coefficients of static stability - that is, the derivatives of the coefficients of the moments with respect to the angles of attack and of yaw; these angles may be determined by the vanes.
Contributing Partner: UNT Libraries Government Documents Department
Compression struts with nonprogressively variable moment of inertia

Compression struts with nonprogressively variable moment of inertia

Date: May 1, 1938
Creator: Radomski, B
Description: The buckling failure conditions for a bar with nonprogressively variable moment of inertia J(sub n), although constant over length l(sub n), are developed.
Contributing Partner: UNT Libraries Government Documents Department
The effect of air-passage length on the optimum fin spacing for maximum cooling

The effect of air-passage length on the optimum fin spacing for maximum cooling

Date: May 1, 1938
Creator: Brevoort, Maurice J
Description: The effect on cooling of baffle length with optimum cylinder finning is discussed. Results from tests of several streamlined cylinders are given. It is shown that by employing several baffles the cooling can be increased several times.
Contributing Partner: UNT Libraries Government Documents Department
Effect of spark-timing regularity on the knock of engine performance

Effect of spark-timing regularity on the knock of engine performance

Date: May 1, 1938
Creator: Biermann, Arnold E
Description: Tests on a high-speed single-cylinder engine are described. The regularity of the spark timing was varied by driving the timer from different engine shafts. A simple and reasonably accurate method of determining the spark timing is described. The results show that irregular spark timing may cause large errors in tests of the knocking properties of fuels. For the engine tested, it was found that a change of one crankshaft degree in spark restart was equivalent to an 0.85 inch Hg change in allowable inlet pressure.
Contributing Partner: UNT Libraries Government Documents Department
Effects of simulated ice formation on the aerodynamic characteristics of an airfoil

Effects of simulated ice formation on the aerodynamic characteristics of an airfoil

Date: May 1, 1938
Creator: Gulick, Beverly G
Description: None
Contributing Partner: UNT Libraries Government Documents Department