rbanffy

✨ Seasoned software developer, proficient in Python, Java. Less proficient in Ruby and Lisp. A bit rusty in C and C++. Learning Erlang very slowly. Also a computer collector and restorer, lover of 8-bit computers, mainframes and interesting Unix workstations.

email: username at that google mail thing

http://about.me/rbanffy

https://linkedin.com/in/ricardobanffy

[ my public key: https://keybase.io/rbanffy; my proof: https://keybase.io/rbanffy/sigs/HtF1uAf_RNpwIkNP1-YGWP_-3doWV6S5Cc1KywXeLYo ]

πŸ“… Joined in 2008

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✍️ 62,052 posts

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(Replying to PARENT post)

As it is with any box, there is only so much material you can remove from the corners before it disintegrates into disconnected surfaces.
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(Replying to PARENT post)

I actually like the new one better, but that's not saying I like either.

I would just love if my workplace let me use the normal Apple apps, but there are regulatory constrains Apple tools don't meet (such as spying on me to prevent data exfil)

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(Replying to PARENT post)

> I don't understand how the coupling between Orion and Falcon Heavy would be done (can't just put it inside the fairing).

A mechanical coupling is not that difficult to design. There needs to be no communication between FH and Orion for this use case. It could be mounted with the shield on top to simplify the mechanism. Separation could be purely mechanical, with springs.

> I also don't understand how you plan to re-light the engines on the 3 falcon cores for a second burn (required for the delta-v you propose) and the fuel economics.

Reignite only the second stage. Instead of putting the payload in orbit, put it on a suborbital trajectory with a high apogee, then boost down to hit the atmosphere at the desired speed and angle.

> I also don't understand the trajectory you envision. Even if you could re-light the FH engines and couple Orion to it, I don't understand how you would get the re-entry angle correct.

You have the delta-v - just use it in the right orientation. An Orion is lighter than the payload to LEO of the FH, so there will be a lot of propellant for the boost up and the boost down.

> Regarding the mass simulator, it's not clear by your description how the shields would be tested in that scenario.

The shield doesn't care what's inside the Orion - it cares about mass. You might need some attitude control (you can use flywheels) and parachutes if you want to recover anything, but all the rest is optional.

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(Replying to PARENT post)

It can carry an Orion capsule to a suborbital trajectory and achieve the same reentry speeds the capsule experiences returning from the Moon. The trick is doing a second burn pointing down. If you don't use an actual Orion but just a mass simulator, you can even do some very off-nominal reentries to test limits.

There is ample delta-v for that.

πŸ‘€rbanffyπŸ•‘1dπŸ”Ό0πŸ—¨οΈ0

(Replying to PARENT post)

Thank you. I'll check as soon as I can. I remember having asked that in the Ask Different Stack Exchange forum, but I couldn't even find my question.
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(Replying to PARENT post)

They might have found a way of having two versions of Outlook and at least one of them working.

A lot of it is relearning what was forgotten after the Apollo and shuttle programs. The technologies changed so much it’s a whole new spacecraft that looks like what existed only because that’s the best possible shape.

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(Replying to PARENT post)

That NASA’s budget is so influenced by politics is why they can’t take the rapid iteration process of SpaceX - NASA can never fail in public. Any failure (even launch delays, as happened with Challenger) gets blown out of proportion and fuels the risk of further budget cuts, which push them to a β€œsafer”, incremental, but very costly process of refining what is already proven rather than researching the less proven technology.
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