Generally speaking, however, the machines of the 1909-1912 period relied for what automatic stability they had on the principle of the dihedral angle, or flat V, both longitudinally and laterally. Longitudinally this was obtained by setting the tail at a slightly smaller angle than the main planes.
Maspero: Life in Ancient Egypt and Assyria, London, 1891, p. 119. Maspero: Life in Ancient Egypt and Assyria, London, 1891, p. 118. W. Wreszinski: Die Medizin der alten Aegypter, Leipzig, J. C. Hinrichs, 1909-1912.