OVERALL CLASS RECORDS - TURBOPROP ENGINE
Grob/E-Systems Egrett-1 - Altitude without payload (53,574 ft)
Grob/E-Systems Egrett-1 - Altitude with 1,000 kg payload (51,023 ft)
Grob/E-Systems Egrett-1 - Altitude in horizontal flight (53,276)
So feasible i would think looking at turboprop figures.
Pressurisation is the problem without going onto Oxygen.
Actually probably not.
http://www.c-130j.ca/index.php?page=...d=36#world_alt
Can't see the zero payload height on that page for the J
NEW RECORD Country USA Altitude 40,386 feet Aircraft Lockheed Martin C-130J Date 5/14/99 Details ESTABLISHES these records:
Absolute altitude with following payloads: 0 kg; 1,000 kg; 2,000 kg; 5,000 kg; 10,000 k
Not sure if that is the zero payload height.