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Space Shuttle: Difference between revisions
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→A note on thruster efficiency in the atmosphere
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As of May 2015, none of these effects is modeled in Flightgear. | As of May 2015, none of these effects is modeled in Flightgear. | ||
=== Control cross couplings === | |||
The Shuttle has significant cross couplings between the elevon deflection in pitch and roll mode and the rudder as a function of Mach number, all of which are faithfully modeled in FG. One of the main effects is that upward elevon deflection alters the airflow at the aft fuselage, creating additional suction effects which alter the airstream and aerodynamical forces. | |||
In particular, at supersonic speeds yaw stability is somewhat improved at high upward elevon deflection while the effect reverses at subsonic speeds. At the same time, roll control is significantly reduced at full elevon deflection, with the effect being more pronounced at low than at high Mach numbers. | |||
Control surface effectiveness in general drops with increasing Mach number, however the speed at which this happens is different for elevons and rudder. | |||
== Glossary of acronyms == | == Glossary of acronyms == | ||