Editing GPIS 6: Reentry

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== Acknowledgement ==
 
== Acknowledgement ==
  
This chapter was written for the 3rd edition by Mark Paton, to be inserted after chapter 5. Refer to the page's View History tab to see subsequent changes.
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This material was originally contributed by Bruce Irving from the 2nd edition of Go Play In Space. This chapter was written for the 3rd edition by Mark Paton, to be inserted after chapter 5. Refer to the page's View History tab to see subsequent changes.
  
 
== Reentry ==
 
== Reentry ==
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[[File:GPIS_6_PB_06.png]]  
 
[[File:GPIS_6_PB_06.png]]  
[[File:GPIS_6_PB_07.png]]  
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[[File:GPIS_6_PB_07c.png]]  
  
 
4. Now you need to prepare for the deorbit burn. First zoom out then use the arrow buttons on Map MFD to position Cape Canaveral is the centre of the screen (i.e. so there are six grid squares between the cape and the edge of the MFD screen). When you ship emerges from the left of the MFD screen use the retrograde autopilot to turn your engine facing the direction of motion. Then select Orbit MFD, change the projection so the orbit is shown as a circle. Also change the periapsis to “distance above the surface”. Fire the main engines for about 10 seconds until the periapsis distance is about -20 km. Map MFD should show your trajectory ending somewhere in the south Pacific ocean. We can modify the trajectory during entry so we land at the cape using the lift capability of the shuttle with some fine tunings using its thrusters.
 
4. Now you need to prepare for the deorbit burn. First zoom out then use the arrow buttons on Map MFD to position Cape Canaveral is the centre of the screen (i.e. so there are six grid squares between the cape and the edge of the MFD screen). When you ship emerges from the left of the MFD screen use the retrograde autopilot to turn your engine facing the direction of motion. Then select Orbit MFD, change the projection so the orbit is shown as a circle. Also change the periapsis to “distance above the surface”. Fire the main engines for about 10 seconds until the periapsis distance is about -20 km. Map MFD should show your trajectory ending somewhere in the south Pacific ocean. We can modify the trajectory during entry so we land at the cape using the lift capability of the shuttle with some fine tunings using its thrusters.
  
[[File:GPIS_6_PB_09.png]]  
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[[File:GPIS_6_PB_09c.png]]  
  
 
[[File:GPIS_6_PB_11.png]]  
 
[[File:GPIS_6_PB_11.png]]  
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Figure 3.  Orbital burn location and resulting entry path
 
Figure 3.  Orbital burn location and resulting entry path
  
[[File:GPIS_6_PB_12.png]]  
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[[File:GPIS_6_PB_12c.png]]  
 
[[File:GPIS_6_PB_13.png]]  
 
[[File:GPIS_6_PB_13.png]]  
  
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|style="text-align:right" width="33%" |[[GPIS_7:_Mars_Awaits|Chapter 7: Mars Awaits]]
 
|style="text-align:right" width="33%" |[[GPIS_7:_Mars_Awaits|Chapter 7: Mars Awaits]]
 
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[[Category: Articles|Go Play In Space 07]]
 
[[Category:Tutorials|Go Play In Space 07]]
 
 
{{HasPrecis}}
 

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