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By William Frederick Durand

Dieser Buchtitel ist Teil des Digitalisierungsprojekts Springer booklet documents mit Publikationen, die seit den Anfängen des Verlags von 1842 erschienen sind. Der Verlag stellt mit diesem Archiv Quellen für die historische wie auch die disziplingeschichtliche Forschung zur Verfügung, die jeweils im historischen Kontext betrachtet werden müssen. Dieser Titel erschien in der Zeit vor 1945 und wird daher in seiner zeittypischen politisch-ideologischen Ausrichtung vom Verlag nicht beworben.

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Extra info for Aerodynamic Theory: A General Review of Progress Under a Grant of the Guggenheim Fund for the Promotion of Aeronautics

Example text

PROPERTIES OF TYPICAL PROFILES The direction of this "null axis" of the profile is obtained by joining the middle of the profile to the back edge (Fig. 31). For the angle of incidence IY. 5) -1 dx Fig. 31. Angle ofincidcnce for an arched plate with lift zero. OLrx = c n V The resultant lift therefore passes through the middle of the cross-section. For an angle of incidence IY. R::2n(7. 2)] and thus acting at a distance of c/4 from the front edge (Fig. 32). The force resulting from these two components is given by OL = OL~ OL(1.

The experiments are performed in the following manner: While the number of revolutions per minute of the suction apparatus, built into the wing, is kept constant, the angle of incidence is increased by intervals of 6° until separation occurs. Since the pumping output is thus kept more or less constant and is usually large in comparison with the profile drag output, the points corresponding to anyone fixed number of revolutions per minute are approximately in a vertical line where Oem is constant.

Flugtechnik u. Motorl. VI, p. 173, 1915. 22 J 1. GENERAL PROPERTIES OF THE WING that at any rate a continuous pressure distribution is to be desired on the upper side, since every irregularity (buckling of the curve) implies an earlier separation at such a point. The pressure gradient can be increased, without separation of the boundary layer, until a limiting value is reached for which the velocitygradient at the surface becomes zero. 0. A further increase of the pressure gradient would produce a reverse current and separation.

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