By Dana Bell
Air strength colours Vol 1: 1926-42
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36. Characteristic tangents for a profile. 9) the position of the chord is different. 9) by subtracting an angle y' = x/3 from the tangent at the point ~ = O. For a cross-section having an angle of incidence oc, the tangent forms the angle (oc y) and the auxiliary chord lies at the angle, . 18) with the direction of the wind. Here y is the true angle between the tangent and chord, but on account of the uncertainty of the position of the chord it does not belong to the magnitudes which characterize the cross-section.
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. 7) Its point of application is at c/2 when (7. = 0; it approaches c/4 as IY. increases and for negative values of IY. shifts to the right toward co, which it reaches for IY.
389, 1924. - Die Ermittlung von Auftriebsinvarianten vorgegebener Profile. loco cit. Vol. 397, 1924. F. HOHNDORF, Verfahren zur Berechnung des Auftriebes gegebener Tragflachenprofile. loco cit. Vol. 265, 1926. , Theory of Wing Sections of Arbitrary Shape. S. A. Report No. 411, 1931. S. A. Reports Nos. 93, 124, 182, 244, 286, 315, Aerodynamic Characteristics of Airfoils (General Survey). Report 352, Large Scale Aerodynamic Characteristics of Airfoils as Tested in the Variable Density Wind Tunnel (General Survey).