Do simulator games use a realistic trajectory to get into orbit?What are the orbital-mechanical advantages of...
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Do simulator games use a realistic trajectory to get into orbit?
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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?
$begingroup$
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?
orbit launch-trajectories
edited 5 hours ago
DrSheldon
7,69122973
asked 9 hours ago
Sembei NorimakiSembei Norimaki
1362
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.
$endgroup$
add a comment |
$begingroup$
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?
orbit launch-trajectories
edited 5 hours ago
DrSheldon
7,69122973
asked 9 hours ago
Sembei NorimakiSembei Norimaki
1362
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
8 hours ago
$begingroup$
@RussellBorogove - NASA calls it turn a "roll program", or at least it did for Saturn V (Apollo) and the Shuttle.
$endgroup$
– David Hammen
28 mins ago
add a comment |
$begingroup$
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?
orbit launch-trajectories
edited 5 hours ago
DrSheldon
7,69122973
asked 9 hours ago
Sembei NorimakiSembei Norimaki
1362
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
orbit launch-trajectories
edited 5 hours ago
DrSheldon
7,69122973
asked 9 hours ago
Sembei NorimakiSembei Norimaki
1362
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.
edited 5 hours ago
DrSheldon
7,69122973
asked 9 hours ago
Sembei NorimakiSembei Norimaki
1362
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.
edited 5 hours ago
DrSheldon
7,69122973
edited 5 hours ago
DrSheldon
7,69122973
edited 5 hours ago
DrSheldon
7,69122973
7,69122973
asked 9 hours ago
Sembei NorimakiSembei Norimaki
1362
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.
asked 9 hours ago
Sembei NorimakiSembei Norimaki
1362
asked 9 hours ago
Sembei NorimakiSembei Norimaki
1362
1362
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
Sembei Norimaki is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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
8 hours ago
$begingroup$
@RussellBorogove - NASA calls it turn a "roll program", or at least it did for Saturn V (Apollo) and the Shuttle.
$endgroup$
– David Hammen
28 mins ago
add a comment |
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
8 hours ago
$begingroup$
@RussellBorogove - NASA calls it turn a "roll program", or at least it did for Saturn V (Apollo) and the Shuttle.
$endgroup$
– David Hammen
28 mins 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
8 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
8 hours ago
$begingroup$
@RussellBorogove - NASA calls it turn a "roll program", or at least it did for Saturn V (Apollo) and the Shuttle.
$endgroup$
– David Hammen
28 mins ago
$begingroup$
@RussellBorogove - NASA calls it turn a "roll program", or at least it did for Saturn V (Apollo) and the Shuttle.
$endgroup$
– David Hammen
28 mins ago
add a comment |
2 Answers
2
active
oldest
votes
$begingroup$
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.
answered 8 hours ago
Russell BorogoveRussell Borogove
93.2k3313400
$endgroup$
$begingroup$
This is intriguing, so I've asked What are the orbital-mechanical advantages of a long (100+ second) sub-orbital coast phase?
$endgroup$
– uhoh
7 hours ago
add a comment |
$begingroup$
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.
answered 9 hours ago
user25300user25300
111
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.
$endgroup$
add a comment |
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2 Answers
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$begingroup$
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.
answered 8 hours ago
Russell BorogoveRussell Borogove
93.2k3313400
$endgroup$
$begingroup$
This is intriguing, so I've asked What are the orbital-mechanical advantages of a long (100+ second) sub-orbital coast phase?
$endgroup$
– uhoh
7 hours ago
add a comment |
$begingroup$
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.
answered 8 hours ago
Russell BorogoveRussell Borogove
93.2k3313400
$endgroup$
$begingroup$
This is intriguing, so I've asked What are the orbital-mechanical advantages of a long (100+ second) sub-orbital coast phase?
$endgroup$
– uhoh
7 hours ago
add a comment |
$begingroup$
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.
answered 8 hours ago
Russell BorogoveRussell Borogove
93.2k3313400
$endgroup$
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.
answered 8 hours ago
Russell BorogoveRussell Borogove
93.2k3313400
answered 8 hours ago
Russell BorogoveRussell Borogove
93.2k3313400
answered 8 hours ago
Russell BorogoveRussell Borogove
93.2k3313400
answered 8 hours ago
Russell BorogoveRussell Borogove
93.2k3313400
93.2k3313400
$begingroup$
This is intriguing, so I've asked What are the orbital-mechanical advantages of a long (100+ second) sub-orbital coast phase?
$endgroup$
– uhoh
7 hours ago
add a comment |
$begingroup$
This is intriguing, so I've asked What are the orbital-mechanical advantages of a long (100+ second) sub-orbital coast phase?
$endgroup$
– uhoh
7 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
7 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
7 hours ago
add a comment |
$begingroup$
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.
answered 9 hours ago
user25300user25300
111
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.
$endgroup$
add a comment |
$begingroup$
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.
answered 9 hours ago
user25300user25300
111
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.
$endgroup$
add a comment |
$begingroup$
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.
answered 9 hours ago
user25300user25300
111
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.
answered 9 hours ago
user25300user25300
111
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.
answered 9 hours ago
user25300user25300
111
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.
answered 9 hours ago
user25300user25300
111
answered 9 hours ago
user25300user25300
111
111
New contributor
user25300 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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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.
add a comment |
add a comment |
Sembei Norimaki is a new contributor. Be nice, and check out our Code of Conduct.
Sembei Norimaki is a new contributor. Be nice, and check out our Code of Conduct.
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$begingroup$
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
8 hours ago
$begingroup$
@RussellBorogove - NASA calls it turn a "roll program", or at least it did for Saturn V (Apollo) and the Shuttle.
$endgroup$
– David Hammen
28 mins ago