From The Archives: Helios - The Quest For Perpetual Flight

The cover image shows the first flight of the NASA/AeroVironment Helios prototype that took place on Sep. 8, 1999 from Edwards Air Force Base, California.

Handling and performance were test under battery power before installing millions of dollars worth of solar cells. Read more on page 58. 

Engineers are developing special fuel cells to keep Helios up for months at a time. 

Cover of February 28, 2000 issue. 

Helios feature on page 58. 

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