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Technical Report Archive and Image Library
183
National Advisory Committee for Aeronautics Collection
148
USDA Farmers' Bulletins
26
USGS Topographic Map Collection
25
Government Documents A to Z Digitization Project
18
Texas State Publications
5
United States Experiment Station Record
3
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2
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41
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29
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22
15 Minute Series (Topographic)
17
NACA Technical Notes
17
40th Legislature of Texas
4
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253 Matching Results
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Permanent Commission of Aeronautical Studies Report No. 4
Recent accidents, which were the result of structural failure in flight, revealed the necessity of a closer examination of the conditions under which the resistance of airplane structures may be calculated.
Date:
March 1927
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Structural Details From 1926 Paris Aero Salon
Memorandum presenting a description of the structural details of airplanes presented at the 1926 Paris Aero Salon.
Date:
March 1927
Creator:
Rethel, W.
Object Type:
Report
System:
The UNT Digital Library
Systematic Investigation of Joukowsky Wing Sections
Ackeret began systematic polar measurements on Joukowsky wing sections, which were occasionally conducted in the wind tunnel. Under these conditions a considerable number of wing sections were tested during the last four years and the tests are now more or less concluded.
Date:
July 1927
Creator:
Schrenk, O.
Object Type:
Report
System:
The UNT Digital Library
High-Speed Oil Engines for Vehicles Part 2
"Further progress toward the satisfactory solution of the difficult problem of the distribution and atomization of the injected fuel was made by extensive experimentation with various fuel valves, nozzles, and atomizing devices. Valuable information was also obtained through numerous experimental researches on the combustion of oils and the manner of introducing the combustion air into the cylinder, as well as on the physical processes of atomization, the determination of the size of drops, etc. These researches led to the conclusion that it is possible, even without producing great turbulence in the combustion chamber and at moderate pump pressure, if the degree of atomization and the penetrative power of the fuel jet are adapted to the shape of the combustion chamber and to the dimensions of the cylinder" (p. 1).
Date:
March 1927
Creator:
Hausfelder, Ludwig
Object Type:
Report
System:
The UNT Digital Library
High-Speed Oil Engines for Vehicles Part 3
Ignition-chamber engines and their fuel injection systems are investigated. Specific details are provided for fuel-injection nozzles and fuel pumps are provided.
Date:
May 1927
Creator:
Hausfelder, Ludwig
Object Type:
Report
System:
The UNT Digital Library
Determining the Efficiency of Atomization by Its Fineness and Uniformity
Different methods of determining the size of fuel droplets in the atomization process are presented. The distribution of those drops is also presented in graphic form.
Date:
January 1927
Creator:
Sauter, J.
Object Type:
Report
System:
The UNT Digital Library
High-Speed Oil Engines for Vehicles Part 1: Engines With External Atomization of the Fuel, Engines With Internal Atomization of the Fuel, Hot-Bulb Engines, Diesel Engines
Different engines are tested to determine their efficiencies in burning fuel. Fuel injection and ignition chamber engines are also discussed.
Date:
February 1927
Creator:
Hausfelder, Ludwig
Object Type:
Report
System:
The UNT Digital Library
Duralumin Welding
Gas and electric welding of duralumin are discussed. Some of the elements that go into determining a successful weld and inspecting for faults are also described.
Date:
February 1927
Creator:
Nelson, Wm.
Object Type:
Report
System:
The UNT Digital Library
On the Mutual Reaction of Wings and Body
"At the suggestion of Professor Von Karman, I have made a few theoretical investigations of the mutual reaction of the wings and body of an airplane. There was assumed as the basis of my calculations, a strongly idealized body shape, namely, a cylinder extended to infinity at both ends and having its axis parallel to the direction of motion of the airplane. The results are to be regarded as rough approximations for a long airplane body and also for an airship with fins. In my calculations, I have considered only a monoplane in which the axis of the wing is rectilinear" (p. 1).
Date:
February 1927
Creator:
Lennertz, J.
Object Type:
Report
System:
The UNT Digital Library
Climbing Efficiency of Aircraft
The object of this report was to indicate that we frequently only make use of 50 percent of the maximum brake horsepower of the engine in taking off the ground, that this loss is not inevitable, and that the effort to get engines of low weight per horsepower by boosting revolutions is of very little use to bombers and commercial airplanes.
Date:
June 1927
Creator:
Walker, C. C.
Object Type:
Report
System:
The UNT Digital Library
Drag measurements of two thin wing sections at different index values
It is stated that the index value 6000, as found in normal tests of wing sections with a 20 cm chord, falls in the same region where the transition of laminar to turbulent flow takes place on thin flat plates. It is to be expected that slightly cambered, thin wing sections will behave similarly. The following test of two such wing sections were made for the purpose of verifying this supposition.
Date:
June 1927
Creator:
Ackeret, J.
Object Type:
Report
System:
The UNT Digital Library
Investigation of a Wing With an Auxiliary Upper Part
This report presents experiments in which two parts of the wing were arranged so as to form a biplane, which was subjected to normal three-component measurements, the two parts being placed in various relative positions with respect to the gap a and the stagger b.
Date:
June 1927
Creator:
Seiferth, R.
Object Type:
Report
System:
The UNT Digital Library
Experiments With Three Horizontal Empennages
The main objective of these experiments was to determine how the air forces on the whole empennage are affected by varying the size of the elevator without changing the size of the whole empennage. The secondary objective was to determine how the magnitude of the air forces acting on the elevator (or the elevator moments) are affected by varying the angle of attack of the whole empennage, or of the elevator alone.
Date:
July 1927
Creator:
Seiferth, R.
Object Type:
Report
System:
The UNT Digital Library
Effects of Roughness on Airfoils
We will here report on the effects of coarsely roughening not only the pressure side but also the suction or upper side of airfoils, as the first group of a larger series of experiments.
Date:
September 1927
Creator:
Schrenk, O.
Object Type:
Report
System:
The UNT Digital Library
Experiments on airfoils with trailing edge cut away
"Airfoils with their trailing edge cut away are often found on aircraft, as the fins on the hulls of flying boats and the central section of the wings for affording better visibility. It was therefore of some interest to discover the effect of such cutaways on the lift and drag and on the position of the center of pressure. For this purpose, systematic experiments were performed on two different airfoils, a symmetrical airfoil and an airfoil of medium thickness, with successive shortenings of their chords" (p. 1).
Date:
September 1927
Creator:
Ackeret, J.
Object Type:
Report
System:
The UNT Digital Library
Some Notes on Gasoline-Engine Development
Experiments were carried out using a special engine with small glass windows and a stroboscope to record various aspects of engine performance. Valve position, supercharging, and torque recoil were all investigated with this experimental apparatus.
Date:
July 1927
Creator:
Ricardo, H. H.
Object Type:
Report
System:
The UNT Digital Library
Aero Dopes and Varnishes
Report discussing before proceeding to discuss the preparation of dope solutions, it will be necessary to consider some of the essential properties which should be possessed of a dope film, deposited in and on the surface of an aero fabric. The first is that it should tighten the material and second it should withstand weathering.
Date:
July 1927
Creator:
Britton, H. T. S.
Object Type:
Report
System:
The UNT Digital Library
Lindbergh's Flight
Memorandum describing the flights of Charles Lindbergh and some of the calculations that go into the determination of the amount of fuel required, drag, and weight for his trip.
Date:
August 1927
Creator:
Von Parseval, August
Object Type:
Report
System:
The UNT Digital Library
Discussion of the results of the boundary-layer tests of an airfoil fitted with a rotary cylinder
The results of the velocity measurements in the boundary layer described in NACA-TM 411 are here discussed in greater detail. The measurements made were of the velocity distribution in the vicinity of an airfoil model fitted with a rotary cylinder and were undertaken for the purpose of obtaining a closer insight into the phenomena observed in experimenting with this model.
Date:
August 1927
Creator:
Wolff, E. B. & Koning, C.
Object Type:
Report
System:
The UNT Digital Library
Seaplanes floats and hulls. Part 1
This part of the report presents characteristics and graphic representations of water resistance. The laws of similarity are discussed as well as the theory of model tests. The test procedures and model tests of other countries are also discussed.
Date:
August 1927
Creator:
Herrmann, H.
Object Type:
Report
System:
The UNT Digital Library
Seaplanes floats and hulls. Part 2
Different float designs are presented and the investigations are discussed.
Date:
September 1927
Creator:
Herrmann, H.
Object Type:
Report
System:
The UNT Digital Library
Flap Gear for Airplanes: A New Scheme in Which Variation Is Automatic
A variable flap gear, which would function automatically and require no attention during flight appeared to be an attractive idea even in its early stages of development. The advantages of variable camber are described as well as the designs of these automatic flaps.
Date:
April 1927
Creator:
Tiltman, A. Hessell
Object Type:
Report
System:
The UNT Digital Library
Duralumin and Its Corrosion
The types of corrosion and factors of corrosion of duralumin are investigated. Salt water is the most common of the corroding media with which designers have to contend in using duralumin in aircraft and ships.
Date:
April 1927
Creator:
Nelson, Wm.
Object Type:
Report
System:
The UNT Digital Library
Multiplicity of Solutions in Aerodynamics
"One of the most striking phenomena which accompany the flow of fluids such as air and water about bodies, is that of changes in character. This phenomena is still very little understood. We will first discuss the nature of these changes and then show that pure theory leads to a multiplicity of characters of flow, among which we will endeavor to indicate those bearing some analogy to experimental results" (p. 1).
Date:
May 1927
Creator:
Dupont, M.
Object Type:
Report
System:
The UNT Digital Library