goneill wrote:

That is what the Perlan project is trying to explore,
flight in thin air equal to Mars air density,a world glider height record

There's not really much to explo Stall speed is very high, so you
need a huge runway to take off and land, and there will be some
implications concerning the radius of turns. The smaller gravitation has
some influece, too, but I can't tell off hand which.

Stefan