I may have asked this, but I guess never got proper answer.
What is the exact actual meaning when media mention a spacecraft may
skip on the atmosphere and be thrown out in space if it isn't precisely
aimed for re-entry?
Is this just a case of aircraft failing to aim towards atmpsphere dense enough to slow it down for re-entry and instead entering very elliptical orbit?
Or are there actual aerodynamics involved where spacecraft would
generate lift in thin atmosphere and gain altitude (and then get ito elliptical orbit?)
And if the capsule has its het shield oriented to be perfectly
perpendicular to direction of travel, would it still generate lift when
it hits atmosphere?
It's not going to bounce off as if the atmosphere were some kind of trampoline, because there's nowhere to store the energy temporarily in
the atmosphere (unlike a trampoline, which has springs)
On 2022-12-10 18:26, Sylvia Else wrote:
It's not going to bounce off as if the atmosphere were some kind of
trampoline, because there's nowhere to store the energy temporarily in
the atmosphere (unlike a trampoline, which has springs)
On CNN , former NASA head Jom Brindenstine (sp?) says Orion will do
that. Start to penetrate atmosphere, then roll 180° and rise back up
into space to cool down and then re-enter a second time.
https://youtu.be/jvYU1F6wtk0?t=90
I take it they'll just skim upper atmosphere on first shot, not enough
to "go down" and remain in elliptical orbit and on second fall back will
hit enough atmosphere to "go down" ? So when Brindenstine says it will
go back up, this isn't aerodynamic lift, but just orbital mechanics of
an elliptical orbit?
Assuming equatorial orbit for sake of discussion, If it does the "aerobraking" say over latititude 0, would re-entry happen at 180°?
Would such an orbit have 2 perigee and apogees? how would such be
called? (can such orbits exist ?)
On 2022-12-10 18:26, Sylvia Else wrote:
It's not going to bounce off as if the atmosphere were some kind of
trampoline, because there's nowhere to store the energy temporarily in
the atmosphere (unlike a trampoline, which has springs)
On CNN , former NASA head Jom Brindenstine (sp?) says Orion will do
that. Start to penetrate atmosphere, then roll 180° and rise back up
into space to cool down and then re-enter a second time.
https://youtu.be/jvYU1F6wtk0?t=90
I take it they'll just skim upper atmosphere on first shot, not enough
to "go down" and remain in elliptical orbit and on second fall back will
hit enough atmosphere to "go down" ? So when Brindenstine says it will
go back up, this isn't aerodynamic lift, but just orbital mechanics of
an elliptical orbit?
On CNN , former NASA head Jom Brindenstine (sp?) says Orion will do
I think it's aerodynamic lift. All the articles I've found so far (not
many) use the term "lift", and during the re-acquisition after the
first blackout, the track chart shown indicated the path was to descend
to 200000 (ft?) and then increase to about 290000; I'm not sure that
can be accounted for by a tangential path.
If teh capsule has such lift abilities, does that imply it could also
have cross range (left or ight) capabilities too at that stage?
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