Space and Science BS Thread

It sure does! I love that place!




last time I was there I picked up some military style dry cases for $49 each!

 

https://arstechnica.com/science/2021/03/nasa-has-begun-a-study-of-the-sls-rockets-affordability/

 

Guess who's in charge of the study?

 

I have been going to Skycraft my entire life. Not many places you can say that about.

 

Oh, cool semi space related story about those blue cases. They were used to ship/store Faro Arm digital inspection equipment. One of the ones I bought had the operators manual inside and an inspection sheet which was for Tesla motors with their Hawthorn CA address!

 

ULA? Boeing?

The level of corruption is amazing.

 

Every part I've made for spacex, they sent their own crates. They're the only customer ive seen do this. Almost like they don't trust the manufacturer to pack them right... I don't blame them.

 

Don't forget EDL testing for the heat shield system - moon return is a good portion of the velocity of mars return, after all.

LEO - 7.8km/s
Lunar - 11.1km/s
Mars - 13-15km/s

 

Woah, neat! Any idea what the proper term for those are? I can't seem to find them on their website.

 

They literally just call them “blue cases” they almost always have a stack of them chained up outside the store. You can see them in the left most side of the pic of the storefront.
I’ve noticed their site doesn’t seem to have all of their inventory on it. They fit nicely in a Taco!

 

Not sure if this link has already been posted earlier or in the Starlink thread, but here’s an interactive map of the current orbit.
https://satellitemap.space/?fbclid=IwAR0Zb60a5PSZQBqwaSaLig-zETRu4V-8B5kbnpk9AnpWuCnw3CHdknN6mxc

 

I kinda assumed they would do like they do with F9, and do a boostback burn and scrub some of that velocity before they hit the atmosphere.

 

Those look like the fit amazingly. Bet someone could make a little profit in the BST section.

 

No boostback or entry burns for the Starship decents. Superheavy might do the F9 thing, though.

https://www.youtube.com/watch?v=LQTnWEHl5qU

(back from the BFR days)

 

With that plummet in altitude on the right hand side of the graph, I would expect a correlating increase in speed. Kinda like you see in the second graph when it does the flip maneuver. Soon as it loses the wind resistance by going vertical, you see a spike in speed. The plummet looks to be happening around the Karman line as well. Need a longer video with a graph going all the way to space.

 

The graph is alt v speed. Alt descends, speed reduces since it's aerobraking via it's belly surface. Alt starts at 100km (karman line, aka SPACE) and it's braking the whole time, see the attitude sim where the belly is windward. Speed decreases at a slower rate when it goes into it's nose-forward pitch change maneuver, until it does it's fin based flip where speed increases, then notice once the engines light speed decreases again.

Your brain wants to read that as an entry profile, but the graph is alt v speed, nothing more.

 

I see what I'm missing now. The graph has no representation of time, and therefore that drop could be taking as long as the rest of the reentry, but with no atmosphere near the karman line there is nothing to slow it down as it descends.

 

Time is on the top-left of the graphic side. But yeah, it's not on the alt/mach graph. t-0 is from the beginning of reentry. It's noted that the beginning was 10x speed accelerated, but the end is real time.

 

We never get to actually see the beginning though. The simulation starts at 60km/640 seconds into reentry. We can tell from the graph though that from 100/90-85KM that Starship neither accelerates or decelerates. It's traveling a steady mach 28. SO its safeish to assume that there is either insufficient atmosphere for braking, they used an engine to decelerate to deorbit, or gravity does not have the power to cause any further acceleration (terminal velocity).

 

Nice SpaceX production of SN10’s short flight.

Spectacular on board views and closer up look at the landing.

https://twitter.com/SpaceX/status/1371984155500773386?s=20