Report presenting an investigation of problems related to helicopters. Also included are the history of the evolution of the helicopter and a series of propeller experiments.

The advantages of using seaplanes for commercial purposes is discussed. The three primary advantages described include their superior speeds over existing means of transport on the same routes, the available landing fields when flying over the water, and the reduction of distance from the airport to the city is serves due to the seaplane's ability to land in water.

The author recounts his experiments with helicopters. The object of his investigations was to remain stationary in the air for five minutes and to make a closed flight at low altitude. Some of the topics discussed include stabilization, horizontal flight, and directional control.

Wind-driven propellers are much used as sources of power for equipment such as radios. This report establishes the principles involved and acquaints the reader with rules for design of such windmills.

This report discusses the general considerations for the design of aerodynamic laboratories. The dimensions, construction, and components of the wind tunnel are given special attention.

The "L 58" is a monoplane with cantilever wings joined directly to the fuselage. It accordingly belongs to the new school of airplane construction, as founded and developed in Germany. A list of performance characteristics is included.

A closer examination of Newton's formula for air resistance shows that it is well to consider the air as an ordinary fluid, and, indeed for most of the velocities considered, as a non-compressible fluid, so long as the dimensions of the moving body are large in comparison with the mean free path of the particles of air.

High-compression engines are investigated with the three main objects being elimination of vibration, increase of maximum efficiency, and conservation of this efficiency at the highest possible speeds.

Memorandum describing the main problem of soaring flight, which is that it is difficult to maintain altitude and to engage in indefinite continuation of flight without dependence on rising currents from any source. The best chance of success involves utilizing energy stored in the air when the wind speed is constantly and rapidly varying.

Rules, regulations, announcements and lists of personnel for the Rhön Soaring-Flight Contest are presented.

Innovations in design and technique from the Rhön soaring contest are presented in this report.

Report consisting of a list of aircraft belonging to different French aircraft companies.

While the reliability of predictions is poor the author still attempts to gauge the future speeds of airplanes.

Three different Marcel Besson airfoils are investigated in terms of maximum lift, maximum fineness, minimum required power, and wing section drag. Comparisons are then made between the three airfoils.

Explanation of soaring flight. Static and dynamic soaring flight. Results of the Rhon contest. Description of the most important gliders. Notes on Soaring Flight Contests in France and England.

Report presenting a description of the rules and regulations of the 1922 Rhön soaring-flight contest.

Report discussing tires, steel springs, hydraulic shock absorbers, and axle travel are all examined in relation to absorbing landing shocks.

The equilibrium, in still air, of a "stationary" helicopter (i.e., of one having neither vertical nor translational velocity, but a tendency to remain practically motionless within restricted limits of space) presents some difficulty in practice and justifies a theoretical investigation of its "inherent stability," i.e., independent of the pilot.

Memorandum presenting the history and development of airships. Tables containing information and statistics regarding some of the current airships are provided.

This article presents a discussion of the relative merits between monoplanes and biplanes. A comparison of the aerodynamic qualities and advantages of both types are provided.

Factors of safety serve three purposes: provides against trouble arising from unexpectedly large loads, allows for imperfections of workmanship, represents a depreciation allowance. A consideration of these safety factors is provided in this report.

The aim of this article is to present, in broad outline, a scientific method for solving the problem, "Wood or Metal." It will be shown that structural methods have by no means reached their final perfection. The strength of the different materials is discussed as well as different construction methods.

The control of an airplane is discussed beginning with sideways motion and following up with control by weight shifting and by swinging wing tips.

The advantages of variable pitch propellers over constant pitch propellers is presented along with different methods of varying the pitch. The technique of varying the shape of the propeller is presented as the most efficient one.