a flexurally elastic drill rod y% inch in diameter with either a model cambered tail surface or flat rectangular surface swinging about it. (Figs. 2 and 3.) A special spring was provided for producing on the surface a readily variable pitching restoring moment about the rod to correspond to the… … Fig. 2—Rigid plane surface free to pitch and FiG. 3—Rigid cambered surface free to roll pitch and roll the middle of the leading edge of the surface a slender rod projected along the X axis, having a sliding weight on it for varying the position of the center of mass of the system. In the flat-…
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