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Flying the Shuttle - Entry: Difference between revisions
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→De-orbit and entry planning in the Shuttle devel version
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Here's an example of a good de-orbit burn stared from a 320 km orbit 10.000 miles to range to a perigee of 40 km. | Here's an example of a good de-orbit burn stared from a 320 km orbit 10.000 miles to range to a perigee of 40 km. | ||
[[File:Shuttle coming home01.jpg| | [[File:Shuttle coming home01.jpg|600px|De-orbit planning for the Space Shuttle]] | ||
Pitch up and wait for the atmosphere to grab the shuttle. This will be felt initially by a very slow drift of the attitude, trying to reduce pitch. Apply thrusters to keep the nose up. The thrust level needed to hold the 40 degrees will increase with increasing qbar, and eventually the controls will revert to aerodynamical surfaces for roll (qbar = 10 psf) and pitch (qbar = 40 psf). Using the <b>RCS ROT ENTRY DAP</b> steering characteristics changes quite drastically - initially it is probably easier to make minute thruster adjustments with the keyboard, in the later phase a stick or mouse is a much better option. With the <b>Aerojet</b> DAP, the change will hardly be felt as the rate controller logic adapts automatically to all changes in qbar and Mach number. | Pitch up and wait for the atmosphere to grab the shuttle. This will be felt initially by a very slow drift of the attitude, trying to reduce pitch. Apply thrusters to keep the nose up. The thrust level needed to hold the 40 degrees will increase with increasing qbar, and eventually the controls will revert to aerodynamical surfaces for roll (qbar = 10 psf) and pitch (qbar = 40 psf). Using the <b>RCS ROT ENTRY DAP</b> steering characteristics changes quite drastically - initially it is probably easier to make minute thruster adjustments with the keyboard, in the later phase a stick or mouse is a much better option. With the <b>Aerojet</b> DAP, the change will hardly be felt as the rate controller logic adapts automatically to all changes in qbar and Mach number. | ||