NASA NTRS · 19690019483
Heliogyro solar sailer Summary report
Abstract
Large solar sail vehicle to operate in manner of helicopter rotor
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Hedgepeth, J. M., Mac Neal, R. H., Schuerch, H. U.. 1969-06-01. Heliogyro solar sailer Summary report. https://ntrs.nasa.gov/citations/19690019483
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