Mike Swift wrote:


In your idea the helicopter seems to me to be one of those difficult
elements. You should lookup information on how lift is generated in
helicopters, and wing theory. Note that you are especially interested
in flight in the very low density air at 30 km. Start with your rocket
weight say 40,000 kg and you assume the helicopter, motors, and wires
etc are made from that miracle material engineers like to specify,
unobtainium. :-) You may find that the blades of the helicopter must be
several hundred meters in length before you add the weight of the weight
of the other items.

As I understand it, helicopters are unable to rescue people off Mount
Everest, K2 or other mountains. It seems that the Pakistani army has
special helicopters that can go up over 6,000 metres.