Stability in aviation : an introduction to dynamical stability as applied to the motions of aeroplanes (1911)
Bryan, George Hartley, 1864-1928 · London : Macmillan · leaf 74
GRAPHIC STATICS 58 CHAP. The first condition of equilibrium is that these three forces must pass through one point. Siqypose H ^^assfs through the centre of gravity G, then R will also pass through G (Fig. 12). The other condition of equilibrium is that the three forces W, R, H are parallel and… … Fifi. I. — A Chanute Glider. The two superposed planes constitute a "single lifting system," the tail plane being in general " neutral " (§ 36). Being used as a glider, the longitudinal stability would be greater than in a similar aeroplane propelled hori- zontally {§ 55). The photograph was given…
Stability of aeroplanes
Internet Archive · Gerstein - University of Toronto · Public domain (published before 1931). Free to use for anything.