really high altitude helicopter
one really random question that has really been annoying me for a while is
What is stopping a helicopter (probably unmanned) form achieving a really freakish height,
eg + 45 km - 80km range
im not sure how big it would have to be, but the blades would not be regular and the talk would be have to account for the increases in speed and it probably could not it get itself to a high alttitude to start probaly need a ballon to take it up,
and any ideas for testing?
or any major theroy problems?
and any tips or hint?