Human powered flight

> Maybe I should have been more specific about the 'flapjack'.  

Did you mean this one?:
http://www.unrealaircraft.com/wings/cv_flapjack.php

When I saw that it reminded me of experiments I had done with umbrella
shaped discs which catch air very well.  They aren't practical for
planes that move forward at a reasonable speed but what about for a
vertical take off?

Patrick