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X-38 :
Phase 4
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Phase 4
The two main objectives of this phase are to demonstrate free-flight vehicle stability and control characteristics in the supersonic,
transonic, and subsonic flight regimes and to demonstrate the operation of space-qualified systems for the vehicle. Two approaches are
currently being pursued by JSC to achieve supersonic flight: either a high altitude balloon drop or a boost flight after release from the B-52.
More importantly, the vehicle (to be built by JSC using technologies from the Space Shuttle program) will reflect the shape, layout and system
configuration of the eventual space-flight X-38. After delivery to the target conditions (approximately Mach 2 at 80,000 feet) to simulate the
terminal phase of re-entry, flight testing will demonstrate the high altitude supersonic stability including the transition through Mach 1. After
deceleration through the transonic Mach regime, the autonomous vehicle guidance system will maneuver the aircraft into an appropriate
"energy cylinder." While in the cylinder, the parachute will be deployed and the vehicle/parachute will be guided to a soft landing.
Phase 4 Planned Objectives
Demonstrate free-flight vehicle stability and control characteristics in the supersonic, transonic, and subsonic flight regimes.
Demonstrate free-flight vehicle energy management and positioning capabilities.
Demonstrate the operation of space-qualified systems in the vehicle.
Continue the assessment of system reliability.
Refine landing flare techniques.
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Last Modified: February 13, 2001
Responsible NASA Official: Jenny Baer-Riedhart
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