per or cardboard interfered with their independent flexure and tended to prevent oscillations of the structure, while any slack in the cloth covering caused it to flutter and precipitated violent oscillations of the structure for all spar stiffness ratios. On account of these and other indefinite… … Fig. 4.—Warpable two-spar surface general, the observations in- dicated that the stiffer the spars for a given relative stiffness, the higher the speed required to precipitate the resonant vibration. The relative stiffness of the two spars, however, did not seem to influence materially the wind…
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
