Note presenting normal-acceleration and airspeed data obtained for one type of twin-engine transport airplane in commercial operations in order to determine the gust and gust-load experiences of the airplane. Results regarding acceleration experience, gust experience, seasonal effects, and effect of special operating restriction are provided.

From Introduction: "It is shown in the body of this report that the solution to the error problem depends upon a more or less arbitrary definition, the only criterion as to the choice of the definition being the usefulness of the solution to which it leads. In this respect, it may be said of the method derived herein that it is not difficult to apply and appears to lead reasonable values of the errors."

Note presenting the general equations governing the fixed-trim water landing of a straight-keel seaplane with a hull of arbitrary constant cross section in such a form that the landing motions and loads are expressed in terms of the steady planing characteristics of the seaplane.

Report presenting the constant-temperature hot-wire anemometer amplifier and accessories have been developed to provide an instrument with wide frequency response, good stability, and ease of operation. Techniques are described using the equipment to study periodic phenomena such as surge, rotating stall, and wake surveys in centrifugal- and axial-flow compressors.

A general solution, based on the classical buckling criterion, is given for the problem of buckling of low arches under a lateral loading acting toward the center of curvature. For a sinusoidal arch under sinusoidal loading, the critical load can be expressed exactly as a simple function of the beam dimension parameters. For other arch shapes and load distributions, approximate values of the critical load can be obtained by summing a few terms of a rapidly converging Fourier series.

Report discussing the U.S. Geological Survey's investigation of carnotite deposits found at Club Mesa, Colorado.

Report discussing the U.S. Geological Survey's exploration from 1949 to 1951 of carnotite deposits in Outlaw Mesa, Colorado.

A report regarding carnotite resources of Outlaw Mesa, Mesa County, Colorado.

Report presenting a study of the lift and drag characteristics of a number of airfoil sections at supercritical Mach numbers as determined from wind-tunnel tests.

Note presenting corrections for drag, lift, and moment that are derived for an axially symmetrical body placed in the test section of a supersonic tunnel on the assumption that the test section is characterized by a two-dimensional pressure field originating from construction flaws. Assuming irrotational conditions, the velocity potential of the flow around the body is expanded in a threefold manner: in powers of the thickness parameter of the body, in powers of a parameter characterized the inhomogeneity of the basic flow field, and as a Fourier series in the azimuth around the body axis.

Report discussing development drilling on the Ormalian Group, Paradox District, Montrose County, Colorado.

From abstract: Incomplete but recently partly revised estimates indicate the presence of about 10 billion tons of phosphate deposits in the Urited States that is minable under present economic conditions. Deposits too lean in quality or thickness to compete with those in the western and southeastern fields probably contain tens of billions of tons.

Report presenting the effect of a finite trailing-edge thickness on the pressure drag of rectangular and delta wings with truncated diamond-shaped airfoil sections with a given thickness ratio studied for supersonic Mach numbers. Results regarding the effect of wing profile geometry, result of the solution of equations, elimination of base pressure as a parameter, ratio of drag coefficients, pressures inside and outside the Mach cone, and effect of changes in aspect ratio are provided.

Report presenting a modification of the passage contour of a 48-inch centrifugal compressor modified by changing the shape of the hub to control deceleration rates along the blade surfaces in order to improve the internal efficiency of the impeller. Results regarding the overall performance, comparison of internal-flow characteristics of three impeller configurations at design flow rate, and variation of internal-flow characteristics of modified-hub impeller with weight flow are provided.

Report presenting an investigation in the stability tunnel to determine the effect of high-lift devices on the low-speed static-lateral-stability derivatives of a 45 degree sweptback wing of aspect ratio 4.0 and taper ratio 0.6. Comparisons between the increments in the static-lateral-stability derivatives due to flap deflection obtained from experiment and the increments evaluated by a single sweep theory is also made. Results regarding the presentation of results, longitudinal stability characteristics, static lateral stability characteristics, and comparison of calculated and measured values are provided.

Report presenting an investigation in the low-turbulence pressure tunnel to determine the effects of Mach and Reynolds number on the maximum lift characteristics of the NACA 65-006, 64-009, 64-210, and 64(sub 2)-215 airfoil sections in smooth and leading-edge roughness conditions. A range of Mach and Reynolds numbers were explored.

Report issued by the U.S. Bureau of Mines to evaluate the reserves of known coking coal in McDowell County, West Virginia. The study analyzes the properties of coal and coal blends from the area. This report includes tables and maps.

An experimental investigation was conducted to obtain performance data on bearings of length-diameter ratios of 1, 1/2, and 1/4 for comparison with theoretical curves. A 1.375-inch-diameter bearing was tested at speeds up to 6000 rpm and with unit loads from 0 to 900 pounds per square inch. Experimental data for eccentricity ratio and friction followed single lines when plotted against a theoretically derived capacity number, which is equal to Sommerfeld number times the square of the length-diameter ratio.

Report presenting a study of several aspects of transonic flow around the forward portions of wedge profiles by means of interferometry. Measurements were made of the two kinds of flow pattern that occur at the leading edge of a wedge at an angle of attack. Results regarding the flow at leading edge, flow around the corner, method of characteristics, drag coefficient of the wedge at 14.5 degree semiangle, and conditions at bases of shock waves are provided.

Report presenting an investigation of three-dimensional, incompressible, nonviscous, absolute irrotational fluid motion is determined for flow through rotating axial-flow passages bounded by straight blades of finite spacing and infinite axial length lying on meridional planes. Solutions are obtained for five passages with varying blade spacing and hub-tip ratio. The results are presented in such a manner as to apply for all ratios of axial velocity to passage tip speed.

From introduction: The Trace Elements Section Washington Laboratory had developed the methods used in anticipation of handling an increased volume of water analyses as this preliminary project is expanded into a full-scale investigation. The efforts of these groups were coordinated by the Trace Elements Planning and Coordination Office.

Report presenting a description of a low-cost interferometer that is easy to adjust and has a large field of view. The instrument uses small diffraction gratings to produce and recombine separate beams of light. The usual two-parabolic-mirror schileren system can be converted inexpensivley to a diffraction-grating interferometer.

Introduction: Field work during the 1952 field season has supplied new data on the areal extent, composition, and estimated reserves of uranium-bearing carbonaceous rocks in the Fall Creek.area, Bonneville County, Idaho. The following is a preliminary report of progress to describe these new data which supplement the information contained in Trace Elements Memorandum Report 340 (Vine and Moore, 1952). This work was done on behalf of the Division of Raw Materials of the U. S. Atomic Energy Commission.

Note presenting an analysis of the laminar boundary-layer flow about a circular cone at large angles of attack to a supersonic stream in the plane of symmetry by a method applicable in general to the flow about conical bodies. Velocity profiles at the bottom of the cone indicated that the expected tendency of the boundary layer to become thinner on the under side of the cone as the angle of attack is increased.