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Published on Oct 26, 2013
North Texas Near Space 4 was successfully flown on 19 October 2013. The plane attained an altitude of 101k feet and commanded separation from the weather balloon very close to predictions. Several roll autopilot issues were evident in the initial part of the flight resulting in a extended dive. The maximum velocity attained was approximately 493 mph. Level flight was attained by 54k feet and the vehicle hit all waypoints and loitered down over the landing location. The vehicle was landed manually using FPV. Update 11/9: 2 major and several minor issues with software have been run to ground. Roll autopilot capture was delayed due to a coordinate system issue with pitch and roll rate feedbacks. Navigation bearing hunts around the waypoint bearing due to lack of pressure-altitude correction in wind estimate and bearing correction code.