Resource Type
Partner
Collection
Technical Report Archive and Image Library
190
National Advisory Committee for Aeronautics Collection
173
Texas State Publications
11
Harris and Eliza Kempner
2
Boy and Girl Scout Annual Reports
1
Docs In The News
1
Federal Communications Reports
1
Rescuing Texas History, 2017
1
Stillwater History Museum at the Sheerar, Stillwater, Oklahoma
1
Texas Cultures Online
1
1 More
Serial/Series Title
NACA Technical Notes
63
NACA Technical Memorandums
41
NACA Technical Reports
35
NACA Special Reports
23
NACA Wartime Reports
10
United States Bureau of Mines Reports
9
Monthly Report of the Attorney General of the State of Texas
8
NACA Advanced Confidential Reports
7
U.S. Geological Survey bulletin
5
United States Geological Survey Reports
5
22 More
Results:
1 - 24 of
208
next
Static Electricity in Nature and Industry
From Introduction: "In this bulletin "static electricity" is used in its commonly accepted meaning to include the various manifestations that result from the coming together or neutralization of positive and negative charges with have been separated by friction between unlike substances or otherwise. Although the scope of the this report is rather broad, it deals primarily with static electricity as a hazard. Casual and experimental observations recorded herein are thus given for a background and for the purpose of suggesting hazards not yet recognized."
Date:
1939
Creator:
Guest, Paul G.
System:
The UNT Digital Library
Coal Mining in Europe: A Study of Practices in Different Coal Formations and Under Various Economic and Regulatory Conditions Compared with Those in the United States
From Introduction: "The major purpose of this bulletin, as indicated in the preface by Dr. John W. Finch, Director of the Bureau of Mines, is to give a critical review of the coal-mining methods used in the principal producing countries of Europe, to describe the reasons underlying the adoption of these methods, and to contrast them with coal-mining methods employed in the United States."
Date:
1939
Creator:
Rice, George S. & Hartmann, Irving
System:
The UNT Digital Library
Practices and Methods of Preventing and Treating Crude-Oil Emulsions
From Introduction: "This report describes practical methods of preventing the formation of emulsions in oil-producing operations, modern practices and methods of economically dehydrating crude-oil emulsions, and recent advances in emulsion-treating technique."
Date:
1939
Creator:
Shea, G. B.
System:
The UNT Digital Library
Metal-Mine Accidents in the United States During the Calendar Year 1936
Report issued by the U.S. Bureau of Mines covering accidents that happened in metal mines located in the United States including statistics for injuries, fatalities, kinds and causes of accidents, and operational data, such as number of mine workers and shifts worked.
Date:
1939
Creator:
Adams, W. W. & Kolhos, M. E.
System:
The UNT Digital Library
Coal-Mine Accidents in the United States, 1936
Report compiled by the U.S. Bureau of Mines including statistics on fatal and non-fatal accidents in coal mines located in the United States as well as data regarding the various operations (e.g., number of miners employed and average production). The information is organized into tables for comparison and the text draws some overall conclusions in the summary.
Date:
1939
Creator:
Adams, W. W.; Geyer, L. E. & Parry, M. G.
System:
The UNT Digital Library
The Iron and Steel Industries of Europe
Report describing the iron and steel industries in Europe, including the availability of raw material sand the economic set-up of each nation covered.
Date:
1939
Creator:
Wright, Charles Will
System:
The UNT Digital Library
Determination of the Profile Drag of an Airplane Wing in Flight at High Reynolds Numbers
Report presenting flight tests to determine the profile-drag coefficients of a portion of the original wing surface of an all-metal airplane and a portion of the wing made aerodynamically smooth and more nearly fair than the original section. Tests were also carried out to determine the point of transition from laminar to turbulent boundary layer and to determine the velocity distribution along the upper surface of the wing.
Date:
1939
Creator:
Bicknell, Joseph
System:
The UNT Digital Library
Hydrodynamic and Aerodynamic Tests of a Family of Models of Seaplane Floats With Varying Angles of Dead Rise: N.A.C.A. Models 57-A, 57-B, and 57-C
Report presenting testing of three models of V-bottom floats for twin-float seaplanes with varying angles of dead rise were tested in a tank and a wind tunnel. Results regarding the effect of angle of dead rise, height and amount of spray at hump speed, aerodynamic drag, effect of cross-sectional shape and load coefficients, and spray strips are provided.
Date:
July 1939
Creator:
Parkinson, John B.; Olson, Roland E. & House, Rufus O.
System:
The UNT Digital Library
Tests in the gust tunnel of a model of the XBM-1 airplane
Report presenting testing of a dynamically scaled model of a Navy XBM-1 biplane in the gust tunnel to provide data for use in determining the structure of atmospheric gusts from measurements of the motions of the full-scale airplane in rough air. Records for two flights for several gradients were evaluated to give histories of events during passage through the gust.
Date:
October 1939
Creator:
Donely, Philip & Shufflebarger, C. C.
System:
The UNT Digital Library
Theory of Automatic Control of Airplanes
"Methods of automatically controlling the airplane are reviewed. Equations for the controlled motion including inertia effects of the control are developed and methods of investigating the stability of the resulting fifth and higher order equations are presented. The equations for longitudinal and lateral motion with both ideal and non-ideal controls are developed in dimensionless form in terms of control parameters based on simple dynamic tests of the isolated control unit" (p. 1).
Date:
April 1939
Creator:
Weiss, Herbert K.
System:
The UNT Digital Library
Intermittent-flow coefficients of a poppet valve
"Flow coefficients were determined for the inlet valve of a modern air-cooled cylinder during operation of the valve. The cylinder head with valves was mounted on a large tank that could be evacuated. Operating the valve with a rotating cam allowed air to flow through the valve into the evacuated tank. The change of pressure in the tank was a measure of the amount of air flowing though the valve in a given number of cycles. The flow coefficients were determined from the pressure across the valve, the quantity of air flowing, and the valve-lift curve" (p. 1).
Date:
April 1939
Creator:
Waldron, C. D.
System:
The UNT Digital Library
Wind-Tunnel Tests of Several Forms of Fixed Wing Slot in Combination With a Slotted Flap on an N.A.C.A. 23012 Airfoil
Note presenting tests of several forms of fixed wing slot in a large-chord NACA 23012 airfoil in the closed-throat 7- by 10-foot wind tunnel. The airfoil extended completely across the test section so that two-dimensional flow was approximated. The data are presented in the form of tables of important aerodynamic characteristics for each slot tested and as curves of section lift, profile-drag, and pitching-moment coefficients.
Date:
April 1939
Creator:
Bamber, M. J.
System:
The UNT Digital Library
A flight investigation of the distribution of ice-inhibiting fluids on a propeller blade
Report presenting an investigation of the flow of ice-inhibiting fluids over the blade surfaces of a 12.5-foot-daimeter propeller in flight by discharging dyed fluids at various stations along the leading edges of the blades. The effects on the distribution of varying the fluid composition, the blade-surface roughness, and the orifice design were also observed.
Date:
September 1939
Creator:
Rodert, Lewis A.
System:
The UNT Digital Library
Wind-Tunnel Investigation of an N.A.C.A. 23021 Airfoil With Two Arrangements of a 40-Percent-Chord Slotted Flap
Note presenting an investigation in the 7- by 10-foot wind tunnel of an NACA 23021 airfoil with two arrangements of a 40-percent-chord slotted flap. The effect of slot shape, flap position, and flap deflection on the section aerodynamic characteristics was determined. Results regarding coefficients, precision, plain airfoils, and slotted-flap arrangements are provided.
Date:
September 1939
Creator:
Duschik, Frank
System:
The UNT Digital Library
Combined Beam-Column Stresses of Aluminum-Alloy Channel Sections
The results of a research program to obtain design data on the strength of open-channel aluminum-alloy sections subjected to combined column and beam action. The results of the tests of about 70 specimens were graphed for stresses due to axial load and stresses due to bending loading as functions of length to radius of gyration of the specimens. From these graphs a design chart was derived that is suitable for ready use.
Date:
September 1939
Creator:
Gottlieb, R.; Thompson, T. M. & Witt, E. C.
System:
The UNT Digital Library
Wind-Tunnel Investigation of Effect of Yawing on Lateral-Stability Characteristics 2: Rectangular N.A.C.A. 23012 Wing with a Circular Fuselage and a Fin
Note presenting testing of an N.A.C.A. 23012 rectangular wing with rounded tips in combination with a fuselage of circular cross section at several angles of yaw in the NACA 7- by 10-foot wind tunnel. The model was tested as a high-wing, a midwing, and a low-wing monoplane; for each wing location, tests were made with two amounts of dihedral and with partial-span split flaps. Results regarding the wing and fuselage, fin and fuselage, and wing, fuselage, and fin are provided.
Date:
September 1939
Creator:
Bamber, M. J. & House, R. O.
System:
The UNT Digital Library
An instrument for estimating tautness of doped fabrics on aircraft
Technical note presenting the design and use of a spring-loaded tautness meter that can be used in both horizontal and vertical positions to compare the tautness of various panels. Results of tests made on the fabric coverings of various airplanes are reported and discussed.
Date:
September 1939
Creator:
Kline, Gordon M. & Schiefer, Herbert F.
System:
The UNT Digital Library
Resume of Air-Load Data on Slats and Flaps
"A resume of the generally available test data regarding air loads on slats and flaps is presented and data attained up to the fall of 1938 are included. The data are given in the form of N.A.C.A. standard coefficients of air forces and moments on the lift-increasing device and, when available, the aerodynamic characteristics of the combined wing and high-lift device are included. Slats of the Handley Page type, fixed auxiliary airfoils, and flaps of several different types are covered" (p. 1).
Date:
March 1939
Creator:
Wenzinger, Carl J. & Rogallo, Francis M.
System:
The UNT Digital Library
Some Elementary Principles of Shell Stress Analysis With Notes on the Use of the Shear Center
"The analysis of various types of shell under combined bending and torsion is discussed. The calculation and the use of the shear center are touched upon as incidental problems. Twelve fully worked numerical examples are given in an appendix" (p. 1).
Date:
March 1939
Creator:
Kuhn, Paul
System:
The UNT Digital Library
Some fundamental considerations in regard to the use of power in landing an airplane
From Summary: "This note is concerned with the effect of power on landing speed and apparent maximum lift coefficient. It is shown that when secondary effects are neglected, the maximum available increase in lift due to power is equal to the thrust being developed. If the increase in lift due to power is expressed in coefficient form, very high values may be shown under conditions which, on analysis, are found to be wholly impracticable in flight."
Date:
March 1939
Creator:
Diehl, Walter S.
System:
The UNT Digital Library
Adhesion of Ice in Its Relation to the De-Icing of Airplanes
From Summary: "The various possible means of preventing ice adhesion on airplane surfaces are critically reviewed. Results are presented of tests of the adhesives forces between ice and various solid and liquid forces. It is concluded that the de-icing of airplane wings by heat from engine exhaust shows sufficient promise to warrant full-scale tests. For propellers, at least, and possibly for certain small areas such as windshields, radio masts, etc. the use of de-icing or adhesion-preventing liquids will provide the best means of protection."
Date:
August 1939
Creator:
Rothrick, A. M. & Selden, R. F.
System:
The UNT Digital Library
Comparison of Profile-Drag and Boundary-Layer Measurements Obtained in Flight and in the Full-Scale Wind Tunnel
"The effect of the existing turbulence in the full scale tunnel was determined from measurements of the profile drag of an N-22 section by the momentum method under corresponding conditions in flight and the tunnel. The transition-point location on the upper surface of the air-foil was also determined from velocity surveys in the boundary layer. The measurements were made at section lift coefficients from 0.480 to 0.635 with a range of Reynolds Numbers from 4,600,000 to 3,900,000. The results show that the end of transition occurs at approximately the same point on the airfoil in flight and in the tunnel" (p. 1).
Date:
March 1939
Creator:
Goett, Harry J. & Bicknell, Joseph
System:
The UNT Digital Library
Tandem Air Propellers
"Tests of 2-blade, adjustable-pitch, counter rotating tandem model propellers, adjusted to absorb equal power at maximum efficiency, were made at Stanford University. The characteristics, for 15 degrees, 25 degrees, 35 degrees, and 45 degrees pitch settings at 0.75 R of the forward propeller and for 8-1/2 percent, 15 percent, and 30 percent diameter spacings, were compared with those of 2-blade and 4-blade propellers of the same blade form" (p. 1).
Date:
February 1939
Creator:
Lesley, E. P.
System:
The UNT Digital Library
Local Instability of Centrally Loaded Columns of Channel Section and Z-Section
"Charts are presented for the coefficients in formulas for the critical compressive stress at which cross-sectional distortion begins in a thin-wall member with either a channel section or a Z-section with identical flanges. The energy method of Timoshenko was used in the theoretical calculations required for the construction of the charts. The deflection equations were carefully selected to give good accuracy. The calculation of the critical compressive stress at stresses beyond the elastic range is briefly discussed. In order to demonstrate the use of the formulas and the charts in engineering calculations, two illustrative problems are included" (p. 1).
Date:
August 1939
Creator:
Lundquist, Eugene E.
System:
The UNT Digital Library