While the craft is yaw-stable at subsonic speeds, at supersonic and hypersonic speeds the high AoA places the vertical stabilizer essentially outside the airstream, making the craft dynamically unstable in the yaw axis. The entry into the atmosphere is flown at a high AoA of 40 degrees, creating a detached shockwave of hot plasma which limits the direct heat transfer to the fuselage, while at lower Mach numbers the AoA is gradually reduced, leading to a more aircraft-like behavior. ![]() ![]() Through this range, the aerodynamical properties change drastically. Spanning the full range of a rarified atmosphere rushing by at Mach 27 to the dense low atmosphere through which the Shuttle glides at subsonic speeds on final approach, the orbiter probes a huge variety of conditions. The main platform for the aerodynamical, orbital motion and systems simulation is JSBSim, a sophisticated Open Source multi-platform flight dynamics engine which is also used in research and professional applications.įor the 3.6 release, the Shuttle is a beta version - the modeling of aerodynamics, flight controls and systems is in a fairly advanced state, but the visuals (both outside and in-cockpit) and the avionics displays are work in progress. The Space Shuttle model for Flightgear, released together with version 3.6, aims to re-create this experience by a detailed modeling of all aspects of the spacecraft's operations, ranging from sophisticated aerodynamical modeling to a comprehensive simulation of the Shuttle's systems and the effect of their failures.
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