I read this story about nano antennas that collect solar energy and cost pennies a yard.
https://inlportal.inl.gov/portal/server ... =DA_101047
It might be enough to provide 30lbs of thrust from an electric motor to keep a pilot aloft without adding much weight.
Many pilots I'm sure will use it to power a small refrigerator to keep a few cans of beer cold while waiting for a landing out retrieval.
