Do simulator games use a realistic trajectory to get into orbit?What are the orbital-mechanical advantages of a long (100+ second) sub-orbital coast phase?What are the orbital-mechanical advantages of a long (100+ second) sub-orbital coast phase?

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Do simulator games use a realistic trajectory to get into orbit?


What are the orbital-mechanical advantages of a long (100+ second) sub-orbital coast phase?What are the orbital-mechanical advantages of a long (100+ second) sub-orbital coast phase?













5












$begingroup$


In videogames (such as KSP or Spaceflight simulator) people put rockets in orbit with the following procedure:



  • Turn on the engines and move vertically for a bit.


  • Start a roll program to turn the vertical trajectory into a ballistic one.


  • Keep going until the Apoapsis of the trajectory reaches the desired height.


  • Turn off the engine and wait until the rocket (almost) reaches Apoapsis.


  • Burn prograde to increase periapsis until orbit is achieved.


I understand the reasons behind each of this manouveurs, however I'm wondering if this is how real rockets get into orbit.



Cutting off the engine and letting the rocket loose vertical speed looks counter-intuitive to me (you basically spend a lot of fuel to accelerate and then you let the rocket slow down).



So my question is: how do real rockets go in orbit? Is there somewhere an explanation of the manouveurs and trajectory the they follow to get in orbit?










share|improve this question









New contributor



Sembei Norimaki is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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$endgroup$







  • 2




    $begingroup$
    Minor correction; the turn is a "pitch program", not a roll program. Roll is rotation around the long axis of the launcher, and does not itself change the course of the rocket.
    $endgroup$
    – Russell Borogove
    7 hours ago















5












$begingroup$


In videogames (such as KSP or Spaceflight simulator) people put rockets in orbit with the following procedure:



  • Turn on the engines and move vertically for a bit.


  • Start a roll program to turn the vertical trajectory into a ballistic one.


  • Keep going until the Apoapsis of the trajectory reaches the desired height.


  • Turn off the engine and wait until the rocket (almost) reaches Apoapsis.


  • Burn prograde to increase periapsis until orbit is achieved.


I understand the reasons behind each of this manouveurs, however I'm wondering if this is how real rockets get into orbit.



Cutting off the engine and letting the rocket loose vertical speed looks counter-intuitive to me (you basically spend a lot of fuel to accelerate and then you let the rocket slow down).



So my question is: how do real rockets go in orbit? Is there somewhere an explanation of the manouveurs and trajectory the they follow to get in orbit?










share|improve this question









New contributor



Sembei Norimaki is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






$endgroup$







  • 2




    $begingroup$
    Minor correction; the turn is a "pitch program", not a roll program. Roll is rotation around the long axis of the launcher, and does not itself change the course of the rocket.
    $endgroup$
    – Russell Borogove
    7 hours ago













5












5








5





$begingroup$


In videogames (such as KSP or Spaceflight simulator) people put rockets in orbit with the following procedure:



  • Turn on the engines and move vertically for a bit.


  • Start a roll program to turn the vertical trajectory into a ballistic one.


  • Keep going until the Apoapsis of the trajectory reaches the desired height.


  • Turn off the engine and wait until the rocket (almost) reaches Apoapsis.


  • Burn prograde to increase periapsis until orbit is achieved.


I understand the reasons behind each of this manouveurs, however I'm wondering if this is how real rockets get into orbit.



Cutting off the engine and letting the rocket loose vertical speed looks counter-intuitive to me (you basically spend a lot of fuel to accelerate and then you let the rocket slow down).



So my question is: how do real rockets go in orbit? Is there somewhere an explanation of the manouveurs and trajectory the they follow to get in orbit?










share|improve this question









New contributor



Sembei Norimaki is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






$endgroup$




In videogames (such as KSP or Spaceflight simulator) people put rockets in orbit with the following procedure:



  • Turn on the engines and move vertically for a bit.


  • Start a roll program to turn the vertical trajectory into a ballistic one.


  • Keep going until the Apoapsis of the trajectory reaches the desired height.


  • Turn off the engine and wait until the rocket (almost) reaches Apoapsis.


  • Burn prograde to increase periapsis until orbit is achieved.


I understand the reasons behind each of this manouveurs, however I'm wondering if this is how real rockets get into orbit.



Cutting off the engine and letting the rocket loose vertical speed looks counter-intuitive to me (you basically spend a lot of fuel to accelerate and then you let the rocket slow down).



So my question is: how do real rockets go in orbit? Is there somewhere an explanation of the manouveurs and trajectory the they follow to get in orbit?







orbit launch-trajectories






share|improve this question









New contributor



Sembei Norimaki is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.










share|improve this question









New contributor



Sembei Norimaki is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.








share|improve this question




share|improve this question








edited 4 hours ago









DrSheldon

7,69122973




7,69122973






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asked 8 hours ago









Sembei NorimakiSembei Norimaki

1262




1262




New contributor



Sembei Norimaki is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.




New contributor




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Check out our Code of Conduct.









  • 2




    $begingroup$
    Minor correction; the turn is a "pitch program", not a roll program. Roll is rotation around the long axis of the launcher, and does not itself change the course of the rocket.
    $endgroup$
    – Russell Borogove
    7 hours ago












  • 2




    $begingroup$
    Minor correction; the turn is a "pitch program", not a roll program. Roll is rotation around the long axis of the launcher, and does not itself change the course of the rocket.
    $endgroup$
    – Russell Borogove
    7 hours ago







2




2




$begingroup$
Minor correction; the turn is a "pitch program", not a roll program. Roll is rotation around the long axis of the launcher, and does not itself change the course of the rocket.
$endgroup$
– Russell Borogove
7 hours ago




$begingroup$
Minor correction; the turn is a "pitch program", not a roll program. Roll is rotation around the long axis of the launcher, and does not itself change the course of the rocket.
$endgroup$
– Russell Borogove
7 hours ago










2 Answers
2






active

oldest

votes


















5












$begingroup$


I understand the reasons behind each of this manouveurs, however I'm wondering if this is how real rockets get into orbit.



Cutting off the engine and letting the rocket loose vertical speed looks counter-intuitive to me (you basically spend a lot of fuel to accelerate and then you let the rocket slow down).




In most real launches to low Earth orbit, the burn continues from liftoff until orbital insertion, without a coasting phase. Some (like Antares) do coast between the first stage and second stage burn; the exact design of the launcher determines which approach is more efficient.



In flights to higher orbits, for example geosynchronous orbit, a coast phase is always used; this approximates a Hohmann transfer orbit.



In KSP, neither the trajectory nor the rocket design, typically, is optimal, and the planet is much smaller than Earth, so the tradeoffs are different.






share|improve this answer









$endgroup$












  • $begingroup$
    This is intriguing, so I've asked What are the orbital-mechanical advantages of a long (100+ second) sub-orbital coast phase?
    $endgroup$
    – uhoh
    6 hours ago


















1












$begingroup$

That is how real rockets go into orbit, and for orbit you need to lose vertical speed or it would be a spiral. Orbit is about horizontal speed though not vertical.






share|improve this answer








New contributor



user25300 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





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    2 Answers
    2






    active

    oldest

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    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    5












    $begingroup$


    I understand the reasons behind each of this manouveurs, however I'm wondering if this is how real rockets get into orbit.



    Cutting off the engine and letting the rocket loose vertical speed looks counter-intuitive to me (you basically spend a lot of fuel to accelerate and then you let the rocket slow down).




    In most real launches to low Earth orbit, the burn continues from liftoff until orbital insertion, without a coasting phase. Some (like Antares) do coast between the first stage and second stage burn; the exact design of the launcher determines which approach is more efficient.



    In flights to higher orbits, for example geosynchronous orbit, a coast phase is always used; this approximates a Hohmann transfer orbit.



    In KSP, neither the trajectory nor the rocket design, typically, is optimal, and the planet is much smaller than Earth, so the tradeoffs are different.






    share|improve this answer









    $endgroup$












    • $begingroup$
      This is intriguing, so I've asked What are the orbital-mechanical advantages of a long (100+ second) sub-orbital coast phase?
      $endgroup$
      – uhoh
      6 hours ago















    5












    $begingroup$


    I understand the reasons behind each of this manouveurs, however I'm wondering if this is how real rockets get into orbit.



    Cutting off the engine and letting the rocket loose vertical speed looks counter-intuitive to me (you basically spend a lot of fuel to accelerate and then you let the rocket slow down).




    In most real launches to low Earth orbit, the burn continues from liftoff until orbital insertion, without a coasting phase. Some (like Antares) do coast between the first stage and second stage burn; the exact design of the launcher determines which approach is more efficient.



    In flights to higher orbits, for example geosynchronous orbit, a coast phase is always used; this approximates a Hohmann transfer orbit.



    In KSP, neither the trajectory nor the rocket design, typically, is optimal, and the planet is much smaller than Earth, so the tradeoffs are different.






    share|improve this answer









    $endgroup$












    • $begingroup$
      This is intriguing, so I've asked What are the orbital-mechanical advantages of a long (100+ second) sub-orbital coast phase?
      $endgroup$
      – uhoh
      6 hours ago













    5












    5








    5





    $begingroup$


    I understand the reasons behind each of this manouveurs, however I'm wondering if this is how real rockets get into orbit.



    Cutting off the engine and letting the rocket loose vertical speed looks counter-intuitive to me (you basically spend a lot of fuel to accelerate and then you let the rocket slow down).




    In most real launches to low Earth orbit, the burn continues from liftoff until orbital insertion, without a coasting phase. Some (like Antares) do coast between the first stage and second stage burn; the exact design of the launcher determines which approach is more efficient.



    In flights to higher orbits, for example geosynchronous orbit, a coast phase is always used; this approximates a Hohmann transfer orbit.



    In KSP, neither the trajectory nor the rocket design, typically, is optimal, and the planet is much smaller than Earth, so the tradeoffs are different.






    share|improve this answer









    $endgroup$




    I understand the reasons behind each of this manouveurs, however I'm wondering if this is how real rockets get into orbit.



    Cutting off the engine and letting the rocket loose vertical speed looks counter-intuitive to me (you basically spend a lot of fuel to accelerate and then you let the rocket slow down).




    In most real launches to low Earth orbit, the burn continues from liftoff until orbital insertion, without a coasting phase. Some (like Antares) do coast between the first stage and second stage burn; the exact design of the launcher determines which approach is more efficient.



    In flights to higher orbits, for example geosynchronous orbit, a coast phase is always used; this approximates a Hohmann transfer orbit.



    In KSP, neither the trajectory nor the rocket design, typically, is optimal, and the planet is much smaller than Earth, so the tradeoffs are different.







    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered 7 hours ago









    Russell BorogoveRussell Borogove

    93.1k3313400




    93.1k3313400











    • $begingroup$
      This is intriguing, so I've asked What are the orbital-mechanical advantages of a long (100+ second) sub-orbital coast phase?
      $endgroup$
      – uhoh
      6 hours ago
















    • $begingroup$
      This is intriguing, so I've asked What are the orbital-mechanical advantages of a long (100+ second) sub-orbital coast phase?
      $endgroup$
      – uhoh
      6 hours ago















    $begingroup$
    This is intriguing, so I've asked What are the orbital-mechanical advantages of a long (100+ second) sub-orbital coast phase?
    $endgroup$
    – uhoh
    6 hours ago




    $begingroup$
    This is intriguing, so I've asked What are the orbital-mechanical advantages of a long (100+ second) sub-orbital coast phase?
    $endgroup$
    – uhoh
    6 hours ago











    1












    $begingroup$

    That is how real rockets go into orbit, and for orbit you need to lose vertical speed or it would be a spiral. Orbit is about horizontal speed though not vertical.






    share|improve this answer








    New contributor



    user25300 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.





    $endgroup$

















      1












      $begingroup$

      That is how real rockets go into orbit, and for orbit you need to lose vertical speed or it would be a spiral. Orbit is about horizontal speed though not vertical.






      share|improve this answer








      New contributor



      user25300 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.





      $endgroup$















        1












        1








        1





        $begingroup$

        That is how real rockets go into orbit, and for orbit you need to lose vertical speed or it would be a spiral. Orbit is about horizontal speed though not vertical.






        share|improve this answer








        New contributor



        user25300 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
        Check out our Code of Conduct.





        $endgroup$



        That is how real rockets go into orbit, and for orbit you need to lose vertical speed or it would be a spiral. Orbit is about horizontal speed though not vertical.







        share|improve this answer








        New contributor



        user25300 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
        Check out our Code of Conduct.








        share|improve this answer



        share|improve this answer






        New contributor



        user25300 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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        answered 8 hours ago









        user25300user25300

        111




        111




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        New contributor




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