Facebook open sourcing design tools tools to crate solar powered aircraft[1][2]
[1] https://code.fb.com/connectivity/open-s ... ign-tools/
[2] https://github.com/facebookexperimental/FBHALE
[3] http://web.mit.edu/drela/Public/web/aswing/
[4] http://web.mit.edu/drela/Public/web/xrotor/