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Metal Construction Development Part 2: Strip Metal Construction - Wing Spars
Memorandum describing the use of wing spars in metal aircraft. An overview of different types of spurs and testing of the spurs in aircraft are provided.
Date:
August 1929
Creator:
Pollard, H. J.
Object Type:
Report
System:
The UNT Digital Library
Metal Construction Development Part 3: Strip Metal Construction - Wing Ribs
Strip metal construction of wing spars are presented as well as workshop practices.
Date:
August 1929
Creator:
Pollard, H. J.
Object Type:
Report
System:
The UNT Digital Library
Metal Construction Development Part 4: Moments of Inertia of Thin Corrugated Sections
Memorandum presenting equations to calculate the moments of inertia of thin corrugated sections.
Date:
September 1929
Creator:
Pollard, H. J.
Object Type:
Report
System:
The UNT Digital Library
Welding Rustproof Steels
The following experimental results will perhaps increase the knowledge of the process of welding rustproof steels. The experiments were made with two chrome-steel sheets and with two chrome-steel-nickel sheets having the composition shown in Table I.
Date:
September 1929
Creator:
Hoffmann, W.
Object Type:
Report
System:
The UNT Digital Library
Welding of Stainless Materials
"It would appear that welds in some stainless steels, heat-treated in some practicable way, will probably be found to have all the resistance to corrosion that is required for aircraft. Certainly these structures are not subjected to the severe conditions that are found in chemical plants. This article should be considered as an outline of what can be done, not necessarily as instructions, which will enable anyone to obtain satisfactory results in commercial work" (p. 1).
Date:
September 1929
Creator:
Bull, H. & Johnson, Lawrence
Object Type:
Report
System:
The UNT Digital Library
Experiments With a Wing Model From Which the Boundary Is Removed by Suction
The present report deals with a series of tests made for the purpose of improving flow conditions about wings by applying the suction principle (increase of the lift coefficient and reduction of the drag about very thick wing sections). Though not conclusive, the report contains interesting results.
Date:
October 1929
Creator:
Schrenk, Oskar
Object Type:
Report
System:
The UNT Digital Library
Cantilever Wings for Modern Aircraft: Some Aspects of Cantilever Wing Construction with Special Reference to Weight and Torsional Stiffness
In the foregoing remarks I have made an attempt to touch on some of the structural problems met with in cantilever wings, and dealt rather fully with a certain type of single-spar construction. The experimental test wing was a first attempt to demonstrate the principles of this departure from orthodox methods. The result was a wing both torsionally stiff and of light weight - lighter than a corresponding biplane construction.
Date:
November 1929
Creator:
Stieger, H. J.
Object Type:
Report
System:
The UNT Digital Library
Technical Details in the Structural Development of Rohrbach Seaplanes
"The recent trial flights and acceptance tests of the Rohrbach "Romar," the largest seaplane in the world, have yielded results fully confirming the principles followed in its development. Its take-off weight of 19,000 kg, its beating the world record for raising the greatest useful load to 2000 m by almost 2500 kg and its remarkable showing in the seaworthiness tests are the results of intelligent researches, the guiding principles of which are briefly set forth in this article" (p. 1).
Date:
November 1929
Creator:
Mathias, Gotthold & Holzapfel, Adolf
Object Type:
Report
System:
The UNT Digital Library
The Fatigue Strength of Riveted Joints and Lugs
This report deals with a number of tests on riveted joints and lugs for the primary purpose of comparing the several types of riveted joints and to study the effect of various factors on the fatigue strength of lugs. A check was made to ascertain whether or not an estimate of the fatigue life at a certain loading could be made from the dimensions of the joint and the fatigue data of the unnotched materials. Recommendations are made on the proportioning of joints to obtain better fatigue behavior.
Date:
August 1956
Creator:
Schijve, J.
Object Type:
Report
System:
The UNT Digital Library
Tank tests of twin seaplane floats
The following report contains the most essential data for the hydrodynamic portion of the twin-float problem. The following points were successfully investigated: 1) difference between stationary and nonstationary flow; 2) effect of the shape of the step; 3) effect of distance between floats; 4) effect of nose-heavy and tail-heavy moments; 5) effect of the shape of floats; 6) maneuverability.
Date:
October 1928
Creator:
Herrmann, H.; Kempf, G. & Kloess, H.
Object Type:
Report
System:
The UNT Digital Library
Effect of Oxygen on the Ignition of Liquid Fuels
The ignition temperature, ignition lag, and ignition strength of simple and homogeneous fuels in combustion air of small oxygen content differ from what they are in air of greater oxygen content. In the case of small oxygen content, these fuels behave as if mixed unevenly. In the case of air with a definite oxygen content, the simple fuels have two ignition points, between which ignition takes place within a certain temperature range. The phenomena are explained by pyrogenous decomposition, comparison of the individual heat quantities, and the effect of the walls.
Date:
January 1929
Creator:
Pahl, H.
Object Type:
Report
System:
The UNT Digital Library
The Distribution of Loads on Rivets Connecting a Plate to a Beam Under Transverse Loads
"This report gives theoretical discussion of the distribution of leads on rivets connecting a plate to a beam under transverse leads. Two methods of solution are given which are applicable to loads up to the limit of proportionality; in the first the rivets are treated as discrete members, and in the second they are replaced by a continuous system of jointing. A method of solution is also given which is applicable to the case when nonlinear deformations occur in the rivets and the plate, but not in the beam" (p. 1).
Date:
April 1947
Creator:
Vogt, F.
Object Type:
Report
System:
The UNT Digital Library
Calculation of the Induced Efficiency of Heavily Loaded Propellers Having Infinite Number of Blades
Report presenting an approximate method of computing the induced efficiency of heavily loaded propellers in suitable form for extension to finite number of blades and a comparison of results obtained using the method with the data of the Betz-Helmbold theory for heavily loaded propellers.
Date:
January 1939
Creator:
Lösch, F.; Kramer, K. N.; Bock, G. & Nikodemus, R.
Object Type:
Report
System:
The UNT Digital Library
Downwash Measurements Behind Wings With Detached Flow
This investigation, which was made in the small wind tunnel having a diameter of 1.2 m (3.94 feet), embraced three wing models, behind which, at various angles of attack between 0 and 60 degrees, the static pressure and the total pressure along vertical lines (perpendicular to the direction of the undisturbed wind and to the wing span) were measured. The location of these vertical lines are indicated in Figure 1. Moreover, the wing polars were determined by the customary three-component measurements. For testing the pressure field, a Pitot tube and a static probe, both of 2 mm (0.08 in.) in diameter, were mounted 40 mm (1.57 in.) apart on the end of a shaft 1 m (39.37 in.) long.
Date:
August 1931
Creator:
Petersohn, E.
Object Type:
Report
System:
The UNT Digital Library
The Design of Airplane-Engine Superchargers
Report studying the "underlying principles for the computation and design of airplane engine superchargers" (p. 1). With the forms of superchargers and underlying principles of computation, delivery heads per stage of 7,000 to 8,500 meters (air column) at an effective efficiency, based on the adiabatic process, of 0.7 may be attained, the space and weight requirements being kept within reasonable limits.
Date:
October 1937
Creator:
von der Nüll, Werner
Object Type:
Report
System:
The UNT Digital Library
Heat Transfer in the Turbulent Boundary Layer of a Compressible Gas at High Speeds
"The Reynolds law of heat transfer from a wall to a turbulent stream is extended to the case of flow of a compressible gas at high speeds. The analysis is based on the modern theory of the turbulent boundary layer with laminar sublayer. The investigation is carried out for the case of a plate situated in a parallel stream. The results are obtained independently of the velocity distribution in the turbulent boundar layer" (p. 1).
Date:
October 1942
Creator:
Frankl, F. & Voishel, V.
Object Type:
Report
System:
The UNT Digital Library
The 1926 German Seaplane Contest
The report discusses the problem of rating the various seaplane designs from the 1926 seaplane contest. The whole process of rating consists in measuring the climbing speed, flying weight and carrying capacity of a seaplane and then using these data as the basis of a construction problem.
Date:
March 1928
Creator:
Seewald, F.; Blenk, H. & Liebers, F.
Object Type:
Report
System:
The UNT Digital Library
The 1929 Rhon soaring-flight contest
The limitation of the 1929 contest to performance gliders necessitated the establishment of a formula which would make it possible to distinguish between performance gliders and school and training gliders. The sinking speed was therefore adopted as the basis for such a distinction, and the requirement was made that the sinking speed of a performance glider should not exceed 0.8 m/s. The rest of the report details the different entries with regard to design and performance.
Date:
April 1930
Creator:
Lippisch, Alexander
Object Type:
Report
System:
The UNT Digital Library
The 1933 Contest for the Deutsch De La Meurthe Trophy
Report discussing the regulations and airplanes participating in the 1933 contest competing for the Deutsch de la Meurthe trophy.
Date:
October 1933
Creator:
Léglise, Pierre; Hirschauer, L. & Saladin, Raymond
Object Type:
Report
System:
The UNT Digital Library
The 1934 Contest for the Deutsch De La Meurthe Trophy
This report presents a description of the rules, history and new technical innovations in the Deutsch de la Meurthe Cup race of 1934.
Date:
February 1935
Creator:
Léglise, Pierre
Object Type:
Report
System:
The UNT Digital Library
The 5- by 7-meter wind tunnel of the DVL
The report contains a description of the DVL wind tunnel. According to the cones fixed, an elliptical stream with axes 5 by 7 meters and length 9 meters, or a stream 6 by 8 meters in cross section and 11 meters in length is available. The top speed with the smaller cone is 65 meters per second. The testing equipment consists of an automatic six-component balance and a test rig for propellers and engines up to 650 horsepower.
Date:
March 1936
Creator:
Kramer, M.
Object Type:
Report
System:
The UNT Digital Library
The 1000 HP Traffic Airplane of the Zeppelin Works in Staaken
Report details the characteristics and advantages of the swift traffic airplane constructed by Zeppelin Works at Staaken. The maximum speed, weight, construction, layout, and landing capabilities of the plane are included.
Date:
September 1921
Creator:
Rohrbach, A. K.
Object Type:
Report
System:
The UNT Digital Library