If you want to test and fly a helico-pter at an equivalent of 100,000 feet, why not just release it from a weather balloon at that altitude here?
Call me old and grumpy — this idea that we could somehow someday have all the technology, expertise and experience to explore other planets is misguided and a distraction (at best) or a lethal diversion from what really matters, looking after the one we are currently on. Do we really expect that another planet can support us, and will have a benign "ecosystem" to not kill us in days/weeks or even centuries/millennia?
All the countless intertwined systems from bacteria through invertebrates to reptiles & mammals etc... all of which have co-evolved and existed with us, either uncoupled, parasitic or in symbiosis, do we really have the hubris to think that we can create this ourselves, or will magically find a non-lethal match in a goldilocks zone?
TLDR?
why are we doing this on Mars?
"Even if you're on the right track, you'll get run over if you just sit there." -- Will Rogers