On Tue, 7 Aug 2007 18:09:36 -0400, "Morgans"
wrote in :
I think I recall seeing someone do the calculations of how much solar energy
hits the top surface of a sailplane and wing, and it was still not enough to
motor without thermals, if it was all converted to electrical energy.
Here's one that flew across the US seventeen years ago:
http://www.solar-flight.com/sslink.html