Angel Technology HALO-Proteus
Proteus is a twin turbofan high altitude multi mission aircraft powered by Williams International FJ44-2E engines first flown in July 1998. It is designed by Burt Rutan to carry payloads in the 2000-pound class to altitudes above 60,000 feet and remain on station up to 14 hours. Heavier payloads can be carried for shorter missions. It is intended for piloted as well as for UAV missions. Missions for Proteus include telecommunications, reconnaissance, atmospheric research, commercial imaging, and space launch.