Aerodynamic characteristics of thin empirical profiles and their application to the tail surfaces and ailerons of airplanes
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AIRFOILS, THIN - CHARACTERISTICS↗
Engineering topics
Toussaint, A
Publications and source records attributed to Toussaint, A.
Choice of profile for the wings of an airplane. Part I
The choice of the profile for the wings of an airplane is a problem which should be solved by a scientific method based on data obtained by systematic experimentation. The problem, in its present form, may be stated as follows: "To find a profile which has certain required aerodynamic characteristics and which encloses the spars, whose number, dimensions and separating distance are likewise determined by structural considerations." At present, the static test, corresponding to the case of accelerated flight at limited speed, requires the knowledge of the moment of the aerodynamic resultant at the angle of zero lift, and the possibility of controlling the magnitude of the corresponding absolute coefficient within more or less extensive limits.
WINGS - DESIGN & THEORY↗
Choice of profile for the wings of an airplane. Part II
This report gives a general method for drawing airplane profiles. This method is useful, but it leads to a somewhat laborious drawing which becomes quite complicated when we take a transformation function having terms of a high degree.
WINGS - DESIGN & THEORY↗
New Application of Principle of Variable-camber Airfoil : Lachassagne System
In studying the application of his system of varying the camber of airfoil sections, Mr. Lachassagne has just obtained a series of airfoil sections whose polar envelope presents truly remarkable aerodynamic properties.
AIRFOILS, VARIABLE-CAMBER↗
Effect of changing the mean camber of an airfoil section
Methodical experiments with the series of airfoil sections of the same relative thickness and of variable relative cambers can be utilized for determining the effect of the camber on the aerodynamic properties of airfoil sections.
AIRFOILS - S T AE 13A (S C 96-104) (ROYER) - CHARA↗
Lecture on aerodynamics
This lecture deals with four main subjects: methods of studying air resistance, experimental aerodynamics, propellers and stability of airplanes.
AIR RESISTANCE↗
Evolution of modern aviation and experimental and technical researches in aerodynamic laboratories
The evolution of construction techniques and the use of metal in wings is presented. Drag is discussed along with the fuselage and tail. The interaction of these parts is also investigated.
RESEARCH AERODYNAMICS↗
Note on the Resistance of Polished Cylinders (and Cylindrical Wires) with Generatrices Perpendicular to the Airstream
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AIR↗
Drag or negative traction of geared-down supporting propellers in the downward vertical glide of a helicopter
Discussed here are computations of drag or negative traction of geared down supporting propellers in the downward vertical glide of a helicopter. By means of Frounde's Theory, the maximum value of the drag of a windmill is calculated. For wooden propellers, the author finds that the difference between the drag and the weight is proportional to the number of blades and is larger for propellers of small diameter; thus it is 25 kg. for a six blade propeller with a diameter of 2 m. 50. The author notes that if we are to adopt large propellers, we must have recourse to a different method of construction, resulting in large dimension propellers much lighter than those made of wood. In discussing insufficient drag, the author notes that the question of the drag of geared down supporting propellers can only be decided by experiment.
HELICOPTERS↗