Compressed gas thruster for an orbital launch vehicle?During launch, how is the launch vehicle tracked?Smallest launch vehicle by dry massWhich currently operational orbital launch vehicle achieves highest system-specific impulse?What is the basic optimal trajectory for a launch vehicle?Generating an electric field for a colloid thrusterLaunch Vehicle LM2DWhat are some notable cold gas thruster propellants, and why?Sharp nose or Blunt nose vehicle for higher rentry speeds?Break Away Valves for LaunchLoad Relief of a launch vehicle
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Compressed gas thruster for an orbital launch vehicle?
During launch, how is the launch vehicle tracked?Smallest launch vehicle by dry massWhich currently operational orbital launch vehicle achieves highest system-specific impulse?What is the basic optimal trajectory for a launch vehicle?Generating an electric field for a colloid thrusterLaunch Vehicle LM2DWhat are some notable cold gas thruster propellants, and why?Sharp nose or Blunt nose vehicle for higher rentry speeds?Break Away Valves for LaunchLoad Relief of a launch vehicle
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
$begingroup$
Is it possible for a compressed gas thruster to be used to launch a spacecraft into orbit?
Let's say, it's already moving at 250MPH(111.7 meters/second) relative to the planets surface.
Planets surface has 90% of Earth gravity.
Launch vehicle is 50km above the surface.
Lastly, let's assume that bthe compressed gas in question is CO2, and it's temperature is at least 65C before compression.
Also, would it be possible to design a re-usable space plane, capable of delivering one tonne of CO2 to a larger craft in a low orbit, then returning again? Using a compressed gas thruster?
launch engines thrust design-alternative
edited 10 hours ago
Organic Marble
68.6k4 gold badges197 silver badges295 bronze badges
asked 10 hours ago
mzs.112000mzs.112000
362 bronze badges
$endgroup$
add a comment |
$begingroup$
Is it possible for a compressed gas thruster to be used to launch a spacecraft into orbit?
Let's say, it's already moving at 250MPH(111.7 meters/second) relative to the planets surface.
Planets surface has 90% of Earth gravity.
Launch vehicle is 50km above the surface.
Lastly, let's assume that bthe compressed gas in question is CO2, and it's temperature is at least 65C before compression.
Also, would it be possible to design a re-usable space plane, capable of delivering one tonne of CO2 to a larger craft in a low orbit, then returning again? Using a compressed gas thruster?
launch engines thrust design-alternative
edited 10 hours ago
Organic Marble
68.6k4 gold badges197 silver badges295 bronze badges
asked 10 hours ago
mzs.112000mzs.112000
362 bronze badges
$endgroup$
add a comment |
$begingroup$
Is it possible for a compressed gas thruster to be used to launch a spacecraft into orbit?
Let's say, it's already moving at 250MPH(111.7 meters/second) relative to the planets surface.
Planets surface has 90% of Earth gravity.
Launch vehicle is 50km above the surface.
Lastly, let's assume that bthe compressed gas in question is CO2, and it's temperature is at least 65C before compression.
Also, would it be possible to design a re-usable space plane, capable of delivering one tonne of CO2 to a larger craft in a low orbit, then returning again? Using a compressed gas thruster?
launch engines thrust design-alternative
edited 10 hours ago
Organic Marble
68.6k4 gold badges197 silver badges295 bronze badges
asked 10 hours ago
mzs.112000mzs.112000
362 bronze badges
$endgroup$
Is it possible for a compressed gas thruster to be used to launch a spacecraft into orbit?
Let's say, it's already moving at 250MPH(111.7 meters/second) relative to the planets surface.
Planets surface has 90% of Earth gravity.
Launch vehicle is 50km above the surface.
Lastly, let's assume that bthe compressed gas in question is CO2, and it's temperature is at least 65C before compression.
Also, would it be possible to design a re-usable space plane, capable of delivering one tonne of CO2 to a larger craft in a low orbit, then returning again? Using a compressed gas thruster?
launch engines thrust design-alternative
launch engines thrust design-alternative
edited 10 hours ago
Organic Marble
68.6k4 gold badges197 silver badges295 bronze badges
asked 10 hours ago
mzs.112000mzs.112000
362 bronze badges
edited 10 hours ago
Organic Marble
68.6k4 gold badges197 silver badges295 bronze badges
asked 10 hours ago
mzs.112000mzs.112000
362 bronze badges
edited 10 hours ago
Organic Marble
68.6k4 gold badges197 silver badges295 bronze badges
edited 10 hours ago
Organic Marble
68.6k4 gold badges197 silver badges295 bronze badges
edited 10 hours ago
Organic Marble
68.6k4 gold badges197 silver badges295 bronze badges
68.6k4 gold badges197 silver badges295 bronze badges
asked 10 hours ago
mzs.112000mzs.112000
362 bronze badges
asked 10 hours ago
mzs.112000mzs.112000
362 bronze badges
asked 10 hours ago
mzs.112000mzs.112000
362 bronze badges
362 bronze badges
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
$begingroup$
It would not be feasible. Compressed-gas thrusters have a very low specific impulse (a measure of fuel efficiency), and the ratio of launch mass to payload mass goes up exponentially with lower specific impulse. Achieving the horizontal speed needed for orbit is much harder than just gaining altitude, so the 50km start isn’t enough to make it work. One ton of compressed CO2 could in theory accelerate something like 45 grams to orbital speed, but that 45 grams has to include everything that isn’t propellant, including the tank that holds the pressurized gas — clearly not possible.
I assume you’re thinking about balloon launch from Venus. If you can arrange to bring some hydrogen with you, you could presumably make methane and LOX, which could fuel a powerful and efficient engine.
answered 9 hours ago
Russell BorogoveRussell Borogove
96.3k3 gold badges329 silver badges416 bronze badges
$endgroup$
$begingroup$
I am thinking of something like a plane that flys around Venus on solar power, collecting CO2 and storing it in a tank. Then, once enough is collected, it launches itself into space, docks with a tanker-like spacecraft, and that spacecraft could bring hundreds of tonnes of CO2 somewhere else, where it is useful. Ideally, there should be a way to do this without bringing any resources from elsewhere. Is there any known material on Venus, or in it's atmosphere that could be used to propel a spacecraft into a low orbit?
$endgroup$
– mzs.112000
8 hours ago
$begingroup$
You could electrolyse carbon dioxide to carbon monoxide and oxygen. With enough stages that might get you to orbit
$endgroup$
– Steve Linton
5 hours ago
add a comment |
$begingroup$
As the other answer says, flying to orbit on compressed CO2 is right out. Forget that approach.
However, if you are willing to use the CO2 as propellant in a nuclear thermal reactor, that has at least been looked at and found plausible for Mars applications, so maybe it could work at Venus.
Carbon Dioxide is the most readily accessible of all the candidate
martian propellants. Composing 95% of the atmosphere, it can be
obtained by pumping the martian air into a tank. At a typical martian
temperature of 233 K, carbon dioxide liquifies under a pressure of 10
bars. Under these conditions, assuming an isothermal compression
process, liquid CO2 can be manufactured for an energy cost of just
84 kW-hrs per metric ton. The NIMF engine produces over a thousand MW
(thermal). If an electrical capacity of 1 MWe is built in as well,
then the (2800 K, 40 MT) NIMF would be able to fuel itself for a
flight into a high orbit in less than 14 hours! Liquid CO2 has a
density 1.16 times that of water and is eminently storable under
martian conditions.
(NIMF stands for Nuclear rocket using Indigenous Martian Fuel, dreadful acronym)
NIMF appears to have been conceived as a NERVA-like engine in which a nuclear reactor produces thrust by heating a propellant. Significant changes had to be made to use CO2 as the propellant.
The paper is here.
answered 3 hours ago
Organic MarbleOrganic Marble
68.6k4 gold badges197 silver badges295 bronze badges
$endgroup$
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
It would not be feasible. Compressed-gas thrusters have a very low specific impulse (a measure of fuel efficiency), and the ratio of launch mass to payload mass goes up exponentially with lower specific impulse. Achieving the horizontal speed needed for orbit is much harder than just gaining altitude, so the 50km start isn’t enough to make it work. One ton of compressed CO2 could in theory accelerate something like 45 grams to orbital speed, but that 45 grams has to include everything that isn’t propellant, including the tank that holds the pressurized gas — clearly not possible.
I assume you’re thinking about balloon launch from Venus. If you can arrange to bring some hydrogen with you, you could presumably make methane and LOX, which could fuel a powerful and efficient engine.
answered 9 hours ago
Russell BorogoveRussell Borogove
96.3k3 gold badges329 silver badges416 bronze badges
$endgroup$
$begingroup$
I am thinking of something like a plane that flys around Venus on solar power, collecting CO2 and storing it in a tank. Then, once enough is collected, it launches itself into space, docks with a tanker-like spacecraft, and that spacecraft could bring hundreds of tonnes of CO2 somewhere else, where it is useful. Ideally, there should be a way to do this without bringing any resources from elsewhere. Is there any known material on Venus, or in it's atmosphere that could be used to propel a spacecraft into a low orbit?
$endgroup$
– mzs.112000
8 hours ago
$begingroup$
You could electrolyse carbon dioxide to carbon monoxide and oxygen. With enough stages that might get you to orbit
$endgroup$
– Steve Linton
5 hours ago
add a comment |
$begingroup$
It would not be feasible. Compressed-gas thrusters have a very low specific impulse (a measure of fuel efficiency), and the ratio of launch mass to payload mass goes up exponentially with lower specific impulse. Achieving the horizontal speed needed for orbit is much harder than just gaining altitude, so the 50km start isn’t enough to make it work. One ton of compressed CO2 could in theory accelerate something like 45 grams to orbital speed, but that 45 grams has to include everything that isn’t propellant, including the tank that holds the pressurized gas — clearly not possible.
I assume you’re thinking about balloon launch from Venus. If you can arrange to bring some hydrogen with you, you could presumably make methane and LOX, which could fuel a powerful and efficient engine.
answered 9 hours ago
Russell BorogoveRussell Borogove
96.3k3 gold badges329 silver badges416 bronze badges
$endgroup$
$begingroup$
I am thinking of something like a plane that flys around Venus on solar power, collecting CO2 and storing it in a tank. Then, once enough is collected, it launches itself into space, docks with a tanker-like spacecraft, and that spacecraft could bring hundreds of tonnes of CO2 somewhere else, where it is useful. Ideally, there should be a way to do this without bringing any resources from elsewhere. Is there any known material on Venus, or in it's atmosphere that could be used to propel a spacecraft into a low orbit?
$endgroup$
– mzs.112000
8 hours ago
$begingroup$
You could electrolyse carbon dioxide to carbon monoxide and oxygen. With enough stages that might get you to orbit
$endgroup$
– Steve Linton
5 hours ago
add a comment |
$begingroup$
It would not be feasible. Compressed-gas thrusters have a very low specific impulse (a measure of fuel efficiency), and the ratio of launch mass to payload mass goes up exponentially with lower specific impulse. Achieving the horizontal speed needed for orbit is much harder than just gaining altitude, so the 50km start isn’t enough to make it work. One ton of compressed CO2 could in theory accelerate something like 45 grams to orbital speed, but that 45 grams has to include everything that isn’t propellant, including the tank that holds the pressurized gas — clearly not possible.
I assume you’re thinking about balloon launch from Venus. If you can arrange to bring some hydrogen with you, you could presumably make methane and LOX, which could fuel a powerful and efficient engine.
answered 9 hours ago
Russell BorogoveRussell Borogove
96.3k3 gold badges329 silver badges416 bronze badges
$endgroup$
It would not be feasible. Compressed-gas thrusters have a very low specific impulse (a measure of fuel efficiency), and the ratio of launch mass to payload mass goes up exponentially with lower specific impulse. Achieving the horizontal speed needed for orbit is much harder than just gaining altitude, so the 50km start isn’t enough to make it work. One ton of compressed CO2 could in theory accelerate something like 45 grams to orbital speed, but that 45 grams has to include everything that isn’t propellant, including the tank that holds the pressurized gas — clearly not possible.
I assume you’re thinking about balloon launch from Venus. If you can arrange to bring some hydrogen with you, you could presumably make methane and LOX, which could fuel a powerful and efficient engine.
answered 9 hours ago
Russell BorogoveRussell Borogove
96.3k3 gold badges329 silver badges416 bronze badges
answered 9 hours ago
Russell BorogoveRussell Borogove
96.3k3 gold badges329 silver badges416 bronze badges
answered 9 hours ago
Russell BorogoveRussell Borogove
96.3k3 gold badges329 silver badges416 bronze badges
answered 9 hours ago
Russell BorogoveRussell Borogove
96.3k3 gold badges329 silver badges416 bronze badges
96.3k3 gold badges329 silver badges416 bronze badges
$begingroup$
I am thinking of something like a plane that flys around Venus on solar power, collecting CO2 and storing it in a tank. Then, once enough is collected, it launches itself into space, docks with a tanker-like spacecraft, and that spacecraft could bring hundreds of tonnes of CO2 somewhere else, where it is useful. Ideally, there should be a way to do this without bringing any resources from elsewhere. Is there any known material on Venus, or in it's atmosphere that could be used to propel a spacecraft into a low orbit?
$endgroup$
– mzs.112000
8 hours ago
$begingroup$
You could electrolyse carbon dioxide to carbon monoxide and oxygen. With enough stages that might get you to orbit
$endgroup$
– Steve Linton
5 hours ago
add a comment |
$begingroup$
I am thinking of something like a plane that flys around Venus on solar power, collecting CO2 and storing it in a tank. Then, once enough is collected, it launches itself into space, docks with a tanker-like spacecraft, and that spacecraft could bring hundreds of tonnes of CO2 somewhere else, where it is useful. Ideally, there should be a way to do this without bringing any resources from elsewhere. Is there any known material on Venus, or in it's atmosphere that could be used to propel a spacecraft into a low orbit?
$endgroup$
– mzs.112000
8 hours ago
$begingroup$
You could electrolyse carbon dioxide to carbon monoxide and oxygen. With enough stages that might get you to orbit
$endgroup$
– Steve Linton
5 hours ago
$begingroup$
I am thinking of something like a plane that flys around Venus on solar power, collecting CO2 and storing it in a tank. Then, once enough is collected, it launches itself into space, docks with a tanker-like spacecraft, and that spacecraft could bring hundreds of tonnes of CO2 somewhere else, where it is useful. Ideally, there should be a way to do this without bringing any resources from elsewhere. Is there any known material on Venus, or in it's atmosphere that could be used to propel a spacecraft into a low orbit?
$endgroup$
– mzs.112000
8 hours ago
$begingroup$
I am thinking of something like a plane that flys around Venus on solar power, collecting CO2 and storing it in a tank. Then, once enough is collected, it launches itself into space, docks with a tanker-like spacecraft, and that spacecraft could bring hundreds of tonnes of CO2 somewhere else, where it is useful. Ideally, there should be a way to do this without bringing any resources from elsewhere. Is there any known material on Venus, or in it's atmosphere that could be used to propel a spacecraft into a low orbit?
$endgroup$
– mzs.112000
8 hours ago
$begingroup$
You could electrolyse carbon dioxide to carbon monoxide and oxygen. With enough stages that might get you to orbit
$endgroup$
– Steve Linton
5 hours ago
$begingroup$
You could electrolyse carbon dioxide to carbon monoxide and oxygen. With enough stages that might get you to orbit
$endgroup$
– Steve Linton
5 hours ago
add a comment |
$begingroup$
As the other answer says, flying to orbit on compressed CO2 is right out. Forget that approach.
However, if you are willing to use the CO2 as propellant in a nuclear thermal reactor, that has at least been looked at and found plausible for Mars applications, so maybe it could work at Venus.
Carbon Dioxide is the most readily accessible of all the candidate
martian propellants. Composing 95% of the atmosphere, it can be
obtained by pumping the martian air into a tank. At a typical martian
temperature of 233 K, carbon dioxide liquifies under a pressure of 10
bars. Under these conditions, assuming an isothermal compression
process, liquid CO2 can be manufactured for an energy cost of just
84 kW-hrs per metric ton. The NIMF engine produces over a thousand MW
(thermal). If an electrical capacity of 1 MWe is built in as well,
then the (2800 K, 40 MT) NIMF would be able to fuel itself for a
flight into a high orbit in less than 14 hours! Liquid CO2 has a
density 1.16 times that of water and is eminently storable under
martian conditions.
(NIMF stands for Nuclear rocket using Indigenous Martian Fuel, dreadful acronym)
NIMF appears to have been conceived as a NERVA-like engine in which a nuclear reactor produces thrust by heating a propellant. Significant changes had to be made to use CO2 as the propellant.
The paper is here.
answered 3 hours ago
Organic MarbleOrganic Marble
68.6k4 gold badges197 silver badges295 bronze badges
$endgroup$
add a comment |
$begingroup$
As the other answer says, flying to orbit on compressed CO2 is right out. Forget that approach.
However, if you are willing to use the CO2 as propellant in a nuclear thermal reactor, that has at least been looked at and found plausible for Mars applications, so maybe it could work at Venus.
Carbon Dioxide is the most readily accessible of all the candidate
martian propellants. Composing 95% of the atmosphere, it can be
obtained by pumping the martian air into a tank. At a typical martian
temperature of 233 K, carbon dioxide liquifies under a pressure of 10
bars. Under these conditions, assuming an isothermal compression
process, liquid CO2 can be manufactured for an energy cost of just
84 kW-hrs per metric ton. The NIMF engine produces over a thousand MW
(thermal). If an electrical capacity of 1 MWe is built in as well,
then the (2800 K, 40 MT) NIMF would be able to fuel itself for a
flight into a high orbit in less than 14 hours! Liquid CO2 has a
density 1.16 times that of water and is eminently storable under
martian conditions.
(NIMF stands for Nuclear rocket using Indigenous Martian Fuel, dreadful acronym)
NIMF appears to have been conceived as a NERVA-like engine in which a nuclear reactor produces thrust by heating a propellant. Significant changes had to be made to use CO2 as the propellant.
The paper is here.
answered 3 hours ago
Organic MarbleOrganic Marble
68.6k4 gold badges197 silver badges295 bronze badges
$endgroup$
add a comment |
$begingroup$
As the other answer says, flying to orbit on compressed CO2 is right out. Forget that approach.
However, if you are willing to use the CO2 as propellant in a nuclear thermal reactor, that has at least been looked at and found plausible for Mars applications, so maybe it could work at Venus.
Carbon Dioxide is the most readily accessible of all the candidate
martian propellants. Composing 95% of the atmosphere, it can be
obtained by pumping the martian air into a tank. At a typical martian
temperature of 233 K, carbon dioxide liquifies under a pressure of 10
bars. Under these conditions, assuming an isothermal compression
process, liquid CO2 can be manufactured for an energy cost of just
84 kW-hrs per metric ton. The NIMF engine produces over a thousand MW
(thermal). If an electrical capacity of 1 MWe is built in as well,
then the (2800 K, 40 MT) NIMF would be able to fuel itself for a
flight into a high orbit in less than 14 hours! Liquid CO2 has a
density 1.16 times that of water and is eminently storable under
martian conditions.
(NIMF stands for Nuclear rocket using Indigenous Martian Fuel, dreadful acronym)
NIMF appears to have been conceived as a NERVA-like engine in which a nuclear reactor produces thrust by heating a propellant. Significant changes had to be made to use CO2 as the propellant.
The paper is here.
answered 3 hours ago
Organic MarbleOrganic Marble
68.6k4 gold badges197 silver badges295 bronze badges
$endgroup$
As the other answer says, flying to orbit on compressed CO2 is right out. Forget that approach.
However, if you are willing to use the CO2 as propellant in a nuclear thermal reactor, that has at least been looked at and found plausible for Mars applications, so maybe it could work at Venus.
Carbon Dioxide is the most readily accessible of all the candidate
martian propellants. Composing 95% of the atmosphere, it can be
obtained by pumping the martian air into a tank. At a typical martian
temperature of 233 K, carbon dioxide liquifies under a pressure of 10
bars. Under these conditions, assuming an isothermal compression
process, liquid CO2 can be manufactured for an energy cost of just
84 kW-hrs per metric ton. The NIMF engine produces over a thousand MW
(thermal). If an electrical capacity of 1 MWe is built in as well,
then the (2800 K, 40 MT) NIMF would be able to fuel itself for a
flight into a high orbit in less than 14 hours! Liquid CO2 has a
density 1.16 times that of water and is eminently storable under
martian conditions.
(NIMF stands for Nuclear rocket using Indigenous Martian Fuel, dreadful acronym)
NIMF appears to have been conceived as a NERVA-like engine in which a nuclear reactor produces thrust by heating a propellant. Significant changes had to be made to use CO2 as the propellant.
The paper is here.
answered 3 hours ago
Organic MarbleOrganic Marble
68.6k4 gold badges197 silver badges295 bronze badges
answered 3 hours ago
Organic MarbleOrganic Marble
68.6k4 gold badges197 silver badges295 bronze badges
answered 3 hours ago
Organic MarbleOrganic Marble
68.6k4 gold badges197 silver badges295 bronze badges
answered 3 hours ago
Organic MarbleOrganic Marble
68.6k4 gold badges197 silver badges295 bronze badges
68.6k4 gold badges197 silver badges295 bronze badges
add a comment |
add a comment |
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