Author Topic: Reentry possible? (Read 3342 times)

Stanley N · « **Reply #25 on:** October 18, 2018, 06:24:16 PM »

Quote from: Struthio on October 17, 2018, 11:56:00 PM

I assume that the heat shield is ideal and emits all friction energy in form of radiation. Doing this, the surface of the heat shield has the Boltzmann-temperature.

Alternatively, part of the energy/power may heat the vehicle. But that would have to be a small fraction of the 62.5MW which does not really make difference.

I believe some early ICBMs and Soviet testing used radiative heat shields, but I believe all manned missions from Gagarin on used ablative heat shields. Part of the heat shield melts and that is where a lot of the heat goes. Much more than goes to radiative heat transfer.

happenby · « **Reply #26 on:** October 19, 2018, 03:25:34 PM »

Quote from: Struthio on October 18, 2018, 04:57:51 PM

What does that have to do with the question whether a reentry from a low orbit is possible?

There is no such thing as "re entry". Especially from low earth "orbit". The firmament sits as a dome over the earth and nothing gets outside of it because there's water on the upper side of it. Low earth orbit suggests there is an "outer space" where rockets go, and moon landings are done, but that has never been proven and is counter to what we know about the upper atmosphere which is an ether and not "space". Much of what NASA and RASA talk about regarding rockets and space is provably garbage.

Neil Obstat · « **Reply #27 on:** October 21, 2018, 01:27:53 AM »

Quote from: Stanley N on October 18, 2018, 06:24:16 PM

I believe some early ICBMs and Soviet testing used radiative heat shields, but I believe all manned missions from Gagarin on used ablative heat shields. Part of the heat shield melts and that is where a lot of the heat goes. Much more than goes to radiative heat transfer.

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They're saying that the vast majority of the heat energy gets dissipated to the atmosphere. Since heat radiating energy takes TIME, and ends up being very SLOW, the melting material leaving the heat shield would make more sense, since it happens quickly. The effect would be a bright streaking light in the sky trailed by a cloud like exhaust, which is exactly what we see when re-entry occurs, similar to a meteor's action in the sky.
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The Space Shuttle lost a measurable thickness off its tiles each time it re-entered.

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Author Topic: Reentry possible? (Read 3342 times)

Stanley N

Re: Reentry possible?

happenby

Re: Reentry possible?

Neil Obstat

Re: Reentry possible?