NASA NTRS · 19800000549
Drop tower with no aerodynamic drag
Abstract
Cooling air accelerated to match velocity of falling object eliminates drag. 3 meter drop tower with suction fan and specific geometry causes air to accelerate downward at 1 g. Although cooling of molten material released from top is slow because surrounding air moves with it, drop remains nearly spherical.
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Kendall, J. M., Jr.. 1981-04-01. Drop tower with no aerodynamic drag. https://ntrs.nasa.gov/citations/19800000549
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