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Space Shuttle: Difference between revisions
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→RCS DAP schemes
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: A 'stick controls thrust' scheme in which the OMS pod modules are not used. This causes significant mode mixing and has no roll control available (it would have some very limited roll control in reality). | : A 'stick controls thrust' scheme in which the OMS pod modules are not used. This causes significant mode mixing and has no roll control available (it would have some very limited roll control in reality). | ||
; | ; RCS ROT ENTRY | ||
: A 'stick controls rates' DAP designed for entering the atmosphere which enforces a 'no sideslip' attitude in which the nose module is not used. This has very strict deadbands and aggressive gains to combat the yaw instability of the Shuttle upon entry, significant mode mixing and is very propellant-consuming. Do not use in orbit and only activate at the entry interface once the shuttle has the correct attitude! | : A 'stick controls rates' DAP designed for entering the atmosphere which enforces a 'no sideslip' attitude in which the nose module is not used. This has very strict deadbands and aggressive gains to combat the yaw instability of the Shuttle upon entry, significant mode mixing and is very propellant-consuming. Do not use in orbit and only activate at the entry interface once the shuttle has the correct attitude! | ||
; RCS translation | |||
: The only implemented translational DAP in which the stick controls translational thrust along the spacecraft x, y and z axes. Stick to idle commands no thrust, but the Shuttle will of course retain its relative velocity to a fix point until counter-thrust is used. RCS translation can be used for emergency de-orbit burns if the OMS is not available. | |||
<b>Note:</b> In orbit, 'attitude hold' refers to inertial attitude, not to attitude relative to Earth or the horizon. The orbiting Shuttle in an attitude hold mode thus has an apparent slow attitude drift with respect to the horizon. If a fixed attitude relative to Earth is desired, this needs to be actively managed. | |||
== Glossary of acronyms == | == Glossary of acronyms == | ||