Page:Aerial Flight - Volume 2 - Aerodonetics - Frederick Lanchester - 1908.djvu/38

§ 9 gliding angle appears to have been excessive. According to the particulars given the model consists of a folded sheet of paper ballasted by a needle that may be adjusted as required, but the one view given by Marey leaves the exact form in doubt.

Fig. 12 is a form due to Weiss, and derived from experiments with models shaped like a bird; it shows complete stability, and is prone to oscillate in its gliding path just as in the

Fig. 11.

case of the ballasted aeroplane. In construction it consists of a sheet of paper cut to the form shown, the front being folded to give some stiffness to the leading edge, and ballasted by a small piece of lead glued in position. The tips of the "wings" are turned up slightly in the manner shown in the