Helios solar plane - photo
The Helios Prototype was a solar-powered unmanned aerial vehicle developed by NASA and built by AeroVironment, Inc.
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More:
https://www.nasa.gov/centers/dryden/...hUpdate/Helios
Previously:
https://www.homemadetools.net/forum/...502#post147152
https://www.homemadetools.net/forum/...301#post126898
https://www.homemadetools.net/forum/...535#post139401
