Could Jet Engines Be Used for Space Travel?

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SUMMARY

The discussion centers on the feasibility of using jet engines for space travel, specifically in low Earth orbit (LEO). Participants conclude that traditional jet engines cannot function effectively at altitudes above 70 miles due to insufficient atmospheric density for combustion. Alternative propulsion methods, such as ion engines, are suggested as viable options for space travel, as they do not rely on atmospheric oxygen. The consensus is that while jets may produce some thrust in sparse atmospheres, they are not practical for sustained space travel.

PREREQUISITES
  • Understanding of low Earth orbit (LEO) dynamics
  • Knowledge of jet engine mechanics and limitations
  • Familiarity with ion propulsion technology
  • Basic principles of atmospheric density and its effects on propulsion
NEXT STEPS
  • Research the mechanics of ion engines and their applications in space travel
  • Study the principles of atmospheric drag and its impact on satellite orbits
  • Explore alternative propulsion systems for spacecraft, such as electric or mechanical engines
  • Investigate historical proposals for orbital propulsion systems, including ramjets and conductive tethers
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Aerospace engineers, space enthusiasts, and researchers interested in propulsion technologies and the challenges of space travel.

  • #31
BoeingJet said:
I think you are talking about the Buzzard Ramjet.
I think I would very much like to see this Buzzard Ramjet.
:woot:
 
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  • #32
DaveC426913 said:
I think I would very much like to see this Buzzard Ramjet.
Buzzard rams jet?
"An aircraft over the Ivory Coast collided with a Rüppell's vulture at the altitude of 11,300 m (37,100 ft), the current record avian height."
 
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  • #33
jbriggs444 said:
Buzzard rams jet?
"An aircraft over the Ivory Coast collided with a Rüppell's vulture at the altitude of 11,300 m (37,100 ft), the current record avian height."
Holy cow, that's high! And what did he win for his effort...?
 
  • #34
jbriggs444 said:
"An aircraft over the Ivory Coast collided with a Rüppell's vulture at the altitude of 11,300 m (37,100 ft), the current record avian height."
No way. That unlucky bird was sleeping in the intake when the jet was launched. It hung on as long as possible at the intake, but passed out at altitude and got the record for the highest bird "hit". o0)
 
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  • #35
Can't help but wonder what kind of natural selection pressure leads to birds capable of existing at that extreme altitude.
Well above the highest mountains and no food there.
Can get a really long distance glide from that height maybe?

Edit:
Berkeman's explanation noted.
 
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  • #36
Perhaps all the bird wanted was a jetstream hike...
 
  • #37
DaveC426913 said:
its orbit doesn't decay in a matter of mere hours?

The enterprise typically is not in orbit (contrary to what Kirk et al. say) but simply hovering using its impulse engines. Which are reaction-less drives thus nonsense (pending NASA investigation) and not relevant to scientific discussion.

BoB
 
  • #38
rbelli1 said:
The enterprise typically is not in orbit (contrary to what Kirk et al. say) but simply hovering using its impulse engines.
Yeah. No one's ever provided a satisfactory explanation.

Not having discovered orbital velocity in the 23rd centry is about as silly as any other explanation.
 

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