2016 Scientific Ballooning Technologies Workshop Title The X-Calibur Telescope Truss and Gondola Author François Aubin (UMN/Twin Cities) Abstract During the EBEX2013 long duration flight the payload was free to rotate in azimuth. The observed azimuth motion consisted of a superposition of full rotations with a period of 10-30 minutes and oscillatory motion with an amplitude of tens of degrees and an average period of 79 s and period dispersion of 12 s. We hypothesize that the full rotations represent slow rotations of the balloon and the shorter period oscillatory motion is due to torsional oscillations of the flight line. A simple bifilar pendulum model of the flight-line gives a torsional spring constant of 34 kg m^2 / s^2 corresponding to a period of 60 s.
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From hobby to lucrative app gaming business: How Balloon Island grew with AdMob. In 2011, after 20 years of working a job that didn't tap into his pas-.
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