Collection
Technical Report Archive and Image Library
116
National Advisory Committee for Aeronautics Collection
60
Office of Scientific & Technical Information Technical Reports
50
TRAIL Microcard Collection
31
Texas Attorney General Opinions
17
Texas State Publications
3
Government Documents A to Z Digitization Project
1
USDA Farmers' Bulletins
1
Serial/Series Title
NACA Research Memorandums
36
Oak Ridge National Laboratory Reports
23
NACA Technical Notes
21
CF (Series)
18
Atomic Energy Commission Reports
13
United States Geological Survey Reports
8
Trace elements investigations report
7
ORNL (Series)
5
University of California Radiation Laboratory Reports
4
NACA Technical Reports
3
35 More
Country
187 Matching Results
Results open in a new window/tab.
Results:
1 - 24 of
187
next
Beef Cattle for Breeding Purposes.
Describes how to select and manage beef cattle that will be used for breeding.
Date:
February 1957
Creator:
Clark, R. T. (Richard Turnbull), 1902-1965 & Baker, A. L. (Alfred Leroy), 1898-
Object Type:
Book
System:
The UNT Digital Library
Additional Experiments With Flat-Top Wing- Body Combinations at High Supersonic Speeds
Memorandum presenting an experimental study of the effects of several variations in configuration geometry on the aerodynamic characteristics of flat-top wing-body combinations. Generally, the configurations consist of one half of a body of revolution mounted beneath a wing of essentially arrow plan form. Results regarding the effect of trailing-edge sweep, effect of the addition of auxiliary bodies, effect of tip-flap deflection, effect of dihedral, effect of leading-edge sweep, effect of fuselage fineness ratio, effect of fuselage profile shape, and static longitudinal stability characteristics are provided.
Date:
February 19, 1957
Creator:
Syvertson, Clarence A.; Wong, Thomas J. & Gloria, Hermilo R.
Object Type:
Report
System:
The UNT Digital Library
Dynamic Stability Investigation of Two Right Circular Cylinders in Axial Free Flight at Mach Numbers From 0.4 to 1.7 Fineness-Ratio- 2.56 Cylinder and Fineness-Ratio-4.0 Cylinder With Flared Afterbody
Memorandum presenting two right circular cylinders tested in axial free flight over a Mach number range of 0.4 to 1.7 by using the rocket-boosted-model technique. Results regarding time history, basic data cross plots, center of pressure, and drag are provided.
Date:
February 28, 1957
Creator:
McFall, John C., Jr.
Object Type:
Report
System:
The UNT Digital Library
Influence of Boric Oxide Deposition on Turbojet-Engine Operation
Memorandum presenting a study of the effect of oxide-depositing fuels on engine starting, operation, and performance by using a modified production turbojet engine operated using a trimethyl borate azeotrope as a fuel. Results regarding boric oxide deposition, engine operation and performance, effect of turbine-inlet temperature, and dissipation of boric oxide deposits are provided.
Date:
February 15, 1957
Creator:
Useller, James W.; Burley, Richard R. & Velie, Wallace W.
Object Type:
Report
System:
The UNT Digital Library
Preliminary Investigation of Dynamic Lateral Stability Characteristics of a Configuration of the North American X-15 Research Airplane
Memorandum presenting an investigation to determine the dynamic lateral stability characteristics of a configuration of the North American X-15 research airplane. Of specific concern were characteristic modes, period and damping, airplane response to yaw and roll controls, ratio of roll to sideslip in the Dutch-roll oscillation, and the roll-coupling problem. Results regarding stability-boundary plots, characteristic roots, roll-to-sideslip ratio, and time histories are provided.
Date:
February 8, 1957
Creator:
Moul, Martin T.
Object Type:
Report
System:
The UNT Digital Library
Differential equations of motion for combined flapwise bending, chordwise bending, and torsion of twisted nonuniform rotor blades
The differential equations of motion for the lateral and torsional deformations of twisted rotating beams are developed for application to helicopter rotor and propeller blades. No assumption is made regarding the coincidence of the neutral, elastic, and mass axes, and the generality is such that previous theories involving various simplifications are contained as subcases to the theory presented in this paper. Special attention is given the terms which are not included in previous theories. These terms are largely coupling-type terms associated with the centrifugal forces. Methods of solution of the equations of motion are indicated by selected examples.
Date:
February 1957
Creator:
Houbolt, John C. & Brooks, George W.
Object Type:
Report
System:
The UNT Digital Library
Ground Simulator Studies of the Effects of Valve Friction, Stick Friction, Flexibility, and Backwash on Power Control System Quality
Report presents results of tests made on a power control system by means of a ground simulator to determine the effects of various combinations of valve friction and stick friction on the ability of the pilot to control the system. Various friction conditions were simulated with a rigid control system, a flexible system, and a rigid system having some backlash. For the tests, the period and damping of the simulated airplane were held constant.
Date:
February 8, 1957
Creator:
Brown, B. Porter
Object Type:
Report
System:
The UNT Digital Library
Comparison of the Combustion Performance of Shell UMF, Grade C, MIL-F-5624C, Grade JP-5, Fuels in a Heavy-Duty XRJ47-W-9 Ram-Jet Engine
Comparable combustion performance data for Shell UMF, grade C, and MIL-F-5624C, grade JP-5, fuels were obtained using a heavy-duty version of the XRJ47-W-9 ram-jet engine operated in a 2.75 Mach number free-jet facility. Data were obtained for the two fuels over a range of fuel-air ratios, engine airflows, and engine-inlet temperatures. The test conditions were selected to provide combustor-inlet temperatures. The test conditions were selected to provide combustor-inlet conditions approximately representative of those which would be encountered over a range of altitudes and flight Mach numbers. The variation of combustion efficiency with fuel-air ratio for the two fuels is compared at the several inlet conditions. The pilot-burner ignition and operating limits with both fuels are also included. In general, the combustion efficiency with Shell UMF, grade C, fuel was 1 to 4 points lower than with MIL-F-5624C, grade JP-5, fuel.
Date:
February 19, 1957
Creator:
Ranscht, W. G. & Farley, J. M.
Object Type:
Report
System:
The UNT Digital Library
Methods for obtaining desired helicopter stability characteristics and procedures for stability predictions
A report in two parts: one is a brief review of methods available to helicopter designers for obtaining desired stability characteristics by modifying airframe design and the other is a review of some of the methods of predicting rotor stability derivatives.
Date:
February 1957
Creator:
Gustafson, F. B. & Tapscott, Robert J.
Object Type:
Report
System:
The UNT Digital Library
Ditching investigations of dynamic models and effects of design parameters on ditching characteristics
From Summary: "Data from ditching investigations conducted at the Langley Aeronautical Laboratory with dynamic scale models of various airplanes are presented in the form of tables. The effects of design parameters on the ditching characteristics of airplanes, based on scale-model investigations and on reports of full-scale ditchings, are discussed. Various ditching aids are also discussed as a means of improving ditching behavior."
Date:
February 1957
Creator:
Fisher, Lloyd J. & Hoffman, Edward L.
Object Type:
Report
System:
The UNT Digital Library
Effect of Frequency and Temperature on Fatigue of Metals
Note presenting a qualitative approach to the problem of the effect of frequency and temperature on fatigue, as the theoretical and experimental results do not always seem to match. The fatigue problem is examined from the viewpoint of a two-component system.
Date:
February 1957
Creator:
Valluri, S. R.
Object Type:
Report
System:
The UNT Digital Library
On Stokes' Stream Function in Compressible Small-Disturbance Theory
Note presenting a study of Stokes' stream function for subsonic or supersonic flow past axisymmetric bodies of small slope. The first-order equation is found to be nonlinear. It can be linearized if one seeks only the formal order of accuracy of the slender-body approximation.
Date:
February 1957
Creator:
Van Dyke, Milton D.
Object Type:
Report
System:
The UNT Digital Library
A Study of The "Toss Factor" in the Impact Testing of Cermets by the Izod Pendulum Test
The test method presented shows that the "toss energy" contributed by the apparatus for brittle materials is negligible. The total toss energy is considered to consist of two components: (a) recovered stored elastic energy and (b) kinetic energy contributed directly by the apparatus. The results were verified by high-speed motion pictures of the test in operation.
Date:
February 1957
Creator:
Probst, H. B. & McHenry, Howard T.
Object Type:
Report
System:
The UNT Digital Library
Approximate solution for streamlines about a lifting rotor having uniform loading and operating in hovering or low-speed vertical-ascent flight conditions
Report presenting that the usual assumption of a uniform vortex cylinder for the wake vortex structure of a uniformly loaded, lifting rotor operating in the hovering or low-speed vertical-ascent flight conditions does not yield useful results for induced velocities in the region about the periphery of the rotor.
Date:
February 1957
Creator:
Castles, Walter, Jr.
Object Type:
Report
System:
The UNT Digital Library
Summary of 65-Series Compressor-Blade Low-Speed Cascade Data by Use of the Carpet-Plotting Technique
"The carpet-plotting technique is presented in this paper as a more useful and concise method of summarizing cascade data on the NACA 65-series compressor blades given in NACA Technical Note 3916. Carpet plots included permit the selection of the blade camber and the design angle of attack required to fulfill a design vector diagram. Other carpet plots provide means for the prediction of off-design turning angles" (p. 1).
Date:
February 1957
Creator:
Felix, A. Richard
Object Type:
Report
System:
The UNT Digital Library
Wind-tunnel investigation of effect of propeller slipstreams on aerodynamic characteristics of a wing equipped with a 50-percent-chord sliding flap and a 30-percent-chord slotted flap
Report presenting an investigation of the aerodynamic characteristics of a wing equipped with a 50-percent-chord sliding flap and a 30-percent-chord slotted flap operating in the slipstreams of two large-diameter propellers in the 300 mph 7- by 10-foot tunnel. Large tunnel-wall effects for which there are no known correction methods were encountered in the tests. Stalling was found to occur in conditions approaching steady level flight at high-power conditions,but a leading-edge slat effectively delayed the stall.
Date:
February 1957
Creator:
Kuhn, Richard E. & Hayes, William C., Jr.
Object Type:
Report
System:
The UNT Digital Library
Some experimental studies of panel flutter at Mach number 1.3
From Summary: "Experimental studies of panel flutter using thin metal plates were conducted at a Mach number of 1.3 to verify its existence and to study the effects of some structural parameters on the flutter characteristics. The effects of tensile forces and buckling were studied on panels clamped front and rear, in addition to initially buckled panels clamped on all four edges. Panel flutter was obtained under controlled laboratory conditions and it was found that tensile forces, shortening the panels, and increasing the bending stiffness were effective means for eliminating flutter. Buckled panels were more susceptible to flutter than unbuckled panels. No apparent systematic trends in the flutter modes or frequencies could be observed."
Date:
February 1957
Creator:
Sylvester, Maurice A. & Baker, John E.
Object Type:
Report
System:
The UNT Digital Library
Systematic two-dimensional cascade tests of NACA 65-series compressor blades at low speeds
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.
Date:
February 1957
Creator:
Herrig, L. Joseph; Emery, James C. & Erwin, John R.
Object Type:
Report
System:
The UNT Digital Library
Sidewash in the Vicinity of Lifting Swept Wings at Supersonic Speeds
Equations and charts have been presented for the conical part of the sidewash above and below swept wings at small angles of attack. This flow-field component is necessary in making calculations of the wing-induced forces and moments on stores, missiles, and pylons. All supersonic Mach numbers and wing leading-edge sweep angles have been considered.
Date:
February 1957
Creator:
Bobbitt, Percy J. & Maxie, Peter J., Jr.
Object Type:
Report
System:
The UNT Digital Library
Impact-Loads Investigation of Chine-Immersed Models Having Concave-Convex Transverse Shape and Straight or Curved Keel Lines
Note presenting an investigation of three narrow-beam models of concave-convex transverse shape and having, respectively, a straight keel, a curved bow, and a curved stern tested at the Langley impact basin as part of a larger study of hydrodynamic impact loads on chine-immersed bodies of heavy beam loading. Testing occurred over a wide range of trim and initial-flight-path angles. Results regarding the transverse curvature, longitudinal curvature, rough water, and observations on the constant-force-type bottom.
Date:
February 1957
Creator:
Edge, Philip M., Jr.
Object Type:
Report
System:
The UNT Digital Library
Effect of fiber orientation on ball failures under rolling-contact conditions
The rolling-contact fatigue spin rig was used to test balls of a bearing steel at maximum Hertz stresses of 600,000 to 750,000 psi. The effect of fiber orientation was observed with the ball track restricted to passing directly over the poles, coincident with the equator, or randomly around the ball. The polar areas were found to be weaker in fatigue than the nonpolar areas. This resulted in a much greater portion of the failures occurring in the polar areas than would be expected from a homogeneous material. The early failures are discussed.
Date:
February 1957
Creator:
Butler, Robert H.; Bear, H. Robert & Carter, Thomas L.
Object Type:
Report
System:
The UNT Digital Library
On Subsonic Flow Past a Paraboloid of Revolution
Note presenting the use of the Janzen-Rayleigh method of expansion in powers of the stream Mach number to calculate the velocity potential for steady subsonic flow past a paraboloid of revolution. Only the first two terms of the expansion are calculated.
Date:
February 1957
Creator:
Kaplan, Carl
Object Type:
Report
System:
The UNT Digital Library
Tables of Characteristic Functions for Solving Boundary-Value Problems of the Wave Equation with Application to Supersonic Interference
Note presenting tables containing 69,000 values of a set of characteristic functions which first arose in problems of supersonic wing-body interference. The tables are useful in problems of supersonic flow involving aerodynamic shapes which are wholly or in part quasi-cylinders or nearly circular cross sections.
Date:
February 1957
Creator:
Nielsen, Jack N.
Object Type:
Report
System:
The UNT Digital Library
Preliminary Investigation of the Effect of Surface Treatment on the Strength of a Titanium Carbide - 30 Percent Nickel Base Cermet
Specimens of a nickel-bonded titanium carbide cermet were given the following surface treatments: (1) grinding, (2) lapping, (3) blast cleaning, (4) acid roughening, (5) oxidizing, and (6) oxidizing and refinishing. Room-temperature modulus-of-rupture and impact strength varied with the different surface treatments. Considerable strength losses resulted from the following treatments: (1) oxidation at 1600 F for 100 hours, (2) acid roughening, and (3) severe grinding with 60-grit silicon carbide abrasive. The strength loss after oxidation was partially recovered by grit blasting or diamond grinding.
Date:
February 1957
Creator:
Robins, Leonard & Grala, Edward M.
Object Type:
Report
System:
The UNT Digital Library