I flew hang gliders for many years and in the early days got blown over the back of the hill into the "rotor", which is a very violent downdraught. Very lucky to survive!
A kite seat harness is best for soaring dunes, but remember they are not designed for that purpose, and the chance of the harness failing would be very high. Here's a good couple of crossover vids.
www.stokednews.com/?p=46763
stuntnaz said...
I flew RC planes and gliders back in the day and if you flew the plane past the up draft it would disappear behind you and not slowly .Wonder what would happen if you flew your kite to far over the back of the dune.