Patrick Mac Cann - Communication visuelle, web-design et photo It works perfectly well for me using TH-cam app on mobile. You can always click to see the description
I know how much stress you are in Tim, you are practically doing a triathlon (forget marathon. Tim is definitely doing much more than that, for a longer period of time) between the live streams, launches, static fires, OLD and the execution of this video. well done Tim! thanks for all of your hard work!
@@joeyknight8272 Stress is a funny thing though, it's not just about how much you are doing. I think Tim's at the top of his game right now and it probably feels pretty invigorating. He's probably pretty exhausted though. Before long he will need to treat himself to a nice holiday or the pressure of sustaining this output will turn into stress and become a problem.
3:57 Tim, 25 dBz refers to the intensity of the reflection in the Doppler radar. It's a logarithmic scale that represents the volume of precipitation per volume of air.
There's a pretty hilarious movie from the 80s called Strange Brew . It's main characters are named Bob and Doug. Every time I hear their names I think of that move lol.
I've always loved the "simplicity" of slightly-off-center capsule reentry, where the vehicle remains naturally stable and only roll control is available, yet that roll control has a surprising amount of authority by pointing the lift vector anywhere around the full 360. Thinking about reaching a precise splashdown point, though, I'm curious just how much capability they have to affect cross-range and track-length.
Here's the actually tricky part, you can't just let it 'go forward', there will always be lift (which is 'lift' in that it imparts a force perpendicular to the drag) due to the off-center nature of the center of mass. So if you were actually on point, you'd have to do some weird little loop to swoop back to your current trajectory. They must have a default orbital trajectory including incidental lift and then make small adjustments to that profile as conditions require.
I have just found my new favourite You Tube channel, you are a star! I thought, THOUGHT, that I was quite knowledgeable but after spending the entire day over here in the UK watching back to back Tim Dodd videos I realised that I actually knew very little. You are an excellent, amusing and very informative educator Tim. I never, ever watch videos that are longer than about three minutes, until today that was, I've not even used the time stamps once. Superb.
How to get down from orbit: throw a dice... ...check for dice roll after landing under the seat because of the nessesarity for gravity and being stationary to complete. Then proceed with disregarding the result.
I was honestly surprised when I learned that they're de-orbiting using the tiny Draco RCS thrusters, instead of the huge Super-Draco motors. Especially since now that they're splashing down, the only thing they have the Super-Draco's doing is abort contingencies. That said, I do appreciate your explanation on the "why" of that answer - it makes sense!
@nuff sed In fairness, the way they designed the system both the RCS Draco and the massive SuperDraco use the same fuel reserve. So I gotta commend them for that. But still the weight of the engines themselves counts - although it ALSO counts in the competing designs which also use large abort motors that are carried into orbit. So they went from "really cool idea" to "just like everyone else", which is still a bit of a shame.
As an ABSOLUTE HUGE fan of everything that has to do with space, other planets, stars, black holes, neutron stars and just the universe in general, how am I just finding this channel?
Although i knew all the orbital mechanics watching your and scott Manley's video over the past 1 and 1/2 year ,i still watched this video till end because space is fun and watching the same thing over and over isn't boring.thanks for this video
Don't forget Tremor, the space dinosaur ;) Seriously though, praying Bob and Doug get back down to earth, and home to their families, safely and happily!!!!
1:06 that amazing shot Tim on the left, falcon 9 with crew dragon making history in the middle. and a Tesla on the right. one picture carrying some great stuff
"Theres also an article version of this video" My boy, it just got real. Always. Always make a written overview of your videos. With the time you spend on them, it will be verrrry beneficial to you in the future as you reference back, and leave us super nerds to find the info ourselves :)
GRAPHIC NEEDED! (Maybe the graphic I propose below already exists, and someone can simply point me to another of Tim's videos.) Hey Tim, One thing that I believe isn't generally understood by many of us viewers is the relationship between altitude and orbital velocity. I watched this video after seeing your coverage of the landing of DM-2. Over and over you would talk about how decreasing velocity causes the capsule to come closer to the surface of the Earth without explaining why in an easily understandable way. I think if you created a graphic that shows altitude vs. orbital velocity - rings of different altitudes that show each with a different stable orbital velocity - it would show how decreasing velocity causes the capsule to 'fall" into a lower stable orbit. And that eventually the decreased altitude places the capsule into the thicker parts of the Earth's atmosphere, causing more slowing, causing more falling, etc. This could save a lot of potentially confusing words. As is often said, a picture is worth a thousand words. I think a well constructed graphic could really decrease a lot of verbal explanation that loses us in the weeds, or in this case, the vacuum of space. Thanks Tim, for listening, and for all your efforts to keep us in the know about space! :))
I live in portugal, and as of about an hour ago the crew dragon passed over me, i actually got just a frame of crew dragon during THE DAY using my nikon p1000
"Dragonriders" ... I like that! You should @ Elon, asking him to make a custom patch for all astronauts who will ride on Crew Dragon, a patch that proudly declare "Dragonriders"...
Tim, your presentation in this video was exponentially superior to anything that NASA TV has done on this subject. Please keep up the good work! You should be the one on NASA TV.
You definately deserve more views on this video. This is an awesome explanation of something that people don't really think about, and my opinion is that you've done an awesome job. I really love these kinds of videos.
Maybe the ship can't move fast enough to be at the right spot in the right time (that still can't catch fairings every time, and Dragon would have to land at most a few meters from the center to not make the ship roll), maybe the vertical speed is too high and Dragon would break the net, maybe it would be just too much work to certificate this... idk
The man did a bloody 30 minute video about what's happening today in no time at all and RELEASED IT THE DAY IT'S HAPPENING. You're a wizard, Tim. Truly.
If not too much effort can you flash all the metric tech specs in common English specs (exp MPH vs Ft/S). Just a suggestion, I appreciate and respect all your work as presented. Your one the best at what you do. Keep up the excellent work.
When the scrubbed SN5 hop attempts have almost 10x the views of this super cool video :( I mean, I'm super exited for the SN5 hop, but this video is pure gold of work !
Thank u for the video!!! I was wondering why the time it takes to land can vary so much and why they arent landing using the super dracos instead of splashing down- so this video really helped answer the questions I had about it -Can’t wait for the stream later
I never knew the heat shields were designed with an off-center center-of-mass to provide lift and directional control by spinning the dragon. Really interesting.
Timbo... making complicated science simple for the rest of us. I started watching the video in that, I just woke up, condition. After some coffee went in the gullet, I understood orbital mechanics better, thank you! Mike
Another really great video, Tim! The only thing I'd like to have seen more of was how exactly the phasing burns affect the orbit, but I also get that it's a bit more detail than the scope of this video. Maybe an idea for its own video, or as part of one about interesting orbital mechanics.
I really appreciate the effort you put into these videos if I have a question about something eventually you will answer it period and you have the gift of making it easy to understand. Some videos go into these mathematical formulas of orbital mechanics and most people just don't have the math to do that. You don't feel it's necessary to watch every little thing that happens at Boca Chica period And I totally concur with that him to put it in down-to-earth terms so, you da man
Question! I understand the Draco thrusters are used during the phasing burn. But is that what's actually getting the Dragon to start its downward trek toward earth? Because I see that at some point the Dragon flips so that the heat shield is what burns. But when the heat shield is down,, what's actually creating the momentum for the Dragon to deorbit and fall into the earth's atmosphere?
So about 10:10 p.m. EST last night I got a notification from my phone that the ISS was passing overhead. I went out to look and it was very bright (magnitude -4 according to the app I was using). What's cool is that there was a little dot In front of the ISS perfectly matching its trajectory. I am fairly sure that this was the SpaceX Dragon capsule that had just undocked from the ISS a short while before.
Like you said it takes 15 minutes to de-orbit the capsule. That's why they jettisoned the trunk first because now it lowers the total mass of the vehicle that the thrusters have to deorbit. If they did not jettison the trunk it would require more fuel and more time to do the deorbit burn. If it takes too much time they might have to do another phasing burn
LIVED IN ORLANDO FOR 20 YEARS, SEEN HUNDREDS OF LAUNCHES. SEPT 4 2023...12 AM.. SAW MY FIRST CAPSULE COME BACK THROUGH THE ATMOSPHERE COOLEST THING IVE EVER SEEN.
Exactly. If they dropped the trunk afterwards, and the explosive bolts failed, the craft is now unstable in the heatshield first orientation, subjecting the craft to a nose/hatch first reentry. That capsule would begin breaking up due to thermal stress after just a few seconds of this. With their current methodology, if the stage separation fails, they have time to do a number of things, including an EVA to manually separate the service module, or return to the ISS and await rescue.
Great program Tim, perfectly explaining everything relating to Re-entry. I feel as if I am now a semi-expert. Great work and thanks. Hope you can do many, many more such programs. Cheers, Brian
I love this channel and can’t get enough, I have questions, what is this craft made of, I’m well aware of metal kindling temperatures - steel 1600 degrees - aluminum 660 degrees - Magnesium 650 degrees How is this craft resisting 1900 degrees for over 6 minutes without melting into molten metal? Also how does this craft plot a route back to Earth as is clearly spinning at approximately 1000 miles per hour? Please excuse my ignorance on the subject, I don’t know much about it, but fascinates me. Keep up the great work. Cheers!
So why did SpaceX choose a splash down style landing over a ground landing like Boeing? Sorry if you've answered this in another video. I've been looking for an answer and haven't quite found it yet. Thanks man, keep up the great work!
Ads: I know that your shows need sponsors to be sustainable, and normally the ads that can be cancelled after a few seconds do not seem a burden to me. I sometimes even watch them. However, the “cancel all ads” offer that came on near the end of the show (just before the kerbal part) was not user friendly, and I got lost trying to get back to the show. This caused me to miss about 5 minutes of the show, and I was so frustrated that I did not watch the rest. Normally, I love your shows, so I want to give you this feedback in hopes that you can get this algorithm back to a normal user experience for me. I’ll get over it, and I still give you a thumbs up for this show. Please keep up the good work.
Superb video. Please do not quit. Question for you is what is happening to the parachute after recovery? Will they be reuses? Thanks for the great video again
Every space video I see so special I cannot get enough. Even watch it sometimes and enjoy music while I immerse. New rock and legend rock like deltaparole tool foofighters nirvana and other.
I recall reading that the Apollo capsule had it’s capsule angle shape because had it had been any taller, heat during reentry would have burned the upper half because of entry airflow.
Tim, Nice episode, great graphics as usual. Tangents can be distracting but they did not go too long. Clearly, the ability to have scheduled space flight will be dependent upon having shuttle type vehicles with good cross-range flight characteristics and less strenuous passenger g-loads. Maybe in a 100 years.
I enjoyed that presentation/explanation of the process of getting back to earth from near-earth orbit. It does leave me with a question, though: If the capsule is entering the atmosphere at about 10 times the speed of a bullet, why not use the super-dracos to do a deceleration burn prior to the de-orbit burn, thus decreasing the dynamic pressure/heat load as the capsule reenters the atmosphere? It seems you would still be able to maintain enough speed to control the capsule's trajectory on reentry, and if the heat/plasma buildup was somewhat lessened, the heat shield would also have a longer lifespan. Not to mention the fact that less heat buildup on reentry would significantly improve the odds of survivable reentry and landing (i.e. shuttle Columbia). Thoughts?
The level of safety that SpaceX and the Orion capsule are being held to is eye opening. Makes me wonder what else NASA was kinda deciding not to check or change on the shuttle just to keep the budget.
Note that prior to STS 107, the space shuttle was used for crew changes to Mir and later ISS, with astronauts or cosmonauts returning from long-duration missions needed assistance to disembark.
Timestamps:
00:00 - Intro
03:10 - Re-Entry Criteria
05:30 - Crew Dragon Re-Entry Timeline
12:35 - Hardware Overview
25:10 - Orbital Mechanics Rundown
29:30 - Summary
Legend
It’s in the video description but okay...
@@peterwmdavis yep it totally is but I'm watching on mobile like the majority of viewers and description timestamps don't work on mobile 😉
@@xtojump they do? What are you watching on
Patrick Mac Cann - Communication visuelle, web-design et photo It works perfectly well for me using TH-cam app on mobile. You can always click to see the description
When he said he'd make a video for today I thought just a 7 minute explanation not a 30 MINUTE BREAKDOWN!!!! I LOVE YOU TIM
It's Tim 😂 go big or go home.
@@vanillaswirl87 you're not wrong
Honestly, what did you expect? It's Tim. 30 min is the shrotest he can do
It’s tim he doesn’t do short
I didn't realize that the video was about 30 minutes long till I read your comment.
I know how much stress you are in Tim, you are practically doing a triathlon (forget marathon. Tim is definitely doing much more than that, for a longer period of time) between the live streams, launches, static fires, OLD and the execution of this video.
well done Tim! thanks for all of your hard work!
Stress my dude is a killer
@@joeyknight8272 Stress is a funny thing though, it's not just about how much you are doing. I think Tim's at the top of his game right now and it probably feels pretty invigorating. He's probably pretty exhausted though. Before long he will need to treat himself to a nice holiday or the pressure of sustaining this output will turn into stress and become a problem.
I'm just surprised he wasn't in one of those boats loitering around the landing site. LOL
Where's this man's Patreon??
@@barakathiongo4835 linked in the description :)
3:57 Tim, 25 dBz refers to the intensity of the reflection in the Doppler radar. It's a logarithmic scale that represents the volume of precipitation per volume of air.
Not Dragon Ball Z Episode 25?
@@ilyaholt8607 it logs rhythm with a volume scale on his radar
I was pretty sure he knew that but was just wondering what the "z" refers to. Anybody know?
@@IDoNotLikeHandlesOnYT It really just distinguishes this use of "dB" against other uses of "dB".
@Roger Walker can't tell if this is legit or broscience
"Bob & Doug", sounds like a burger space corp.
Lmao 🤣
It does
They should name the food place near starship Bob & Doug.
There's a pretty hilarious movie from the 80s called Strange Brew . It's main characters are named Bob and Doug. Every time I hear their names I think of that move lol.
@@goose32373 That's it. I remember now. I knew this name combination wasn't strange to me.
I live in Pensacola and we're pretty excited that they'll be splashing down on our side of the state and in our "backyard" ❤
Wow! Im super exited for you guys, have a good one!
I can already tell this comment will get a crap ton of likes
Yeah, I lived in Pensacola for a year as a Latter-day Saint missionary. Y'all have some beautiful beaches, especially over towards Navarre.
Lucky
@@middletnpyro I thought it was closer to Foley. Hm. Cool anyway that it's in the neighborhood. I went to Mobile a couple times too.
I like how your globe changes depending on what you are talking about
When you talked about the mars rovers it was mars
And now its earth :)
Morten Vajhøj srsly? I never notice xD
It’s a great little Easter egg
It's called a Mova Globe and they're pretty awesome :)
It even faces with the landing site to the camera
They spin, it looks really cool
I've always loved the "simplicity" of slightly-off-center capsule reentry, where the vehicle remains naturally stable and only roll control is available, yet that roll control has a surprising amount of authority by pointing the lift vector anywhere around the full 360. Thinking about reaching a precise splashdown point, though, I'm curious just how much capability they have to affect cross-range and track-length.
Knowing SpaceX it's probably pretty good, I expect the Parachutes present the most accuracy error, simply by there nature
Here's the actually tricky part, you can't just let it 'go forward', there will always be lift (which is 'lift' in that it imparts a force perpendicular to the drag) due to the off-center nature of the center of mass. So if you were actually on point, you'd have to do some weird little loop to swoop back to your current trajectory. They must have a default orbital trajectory including incidental lift and then make small adjustments to that profile as conditions require.
I deeply appreciate the technical depth of your videos. I am a science geek and I am starved for this information. Thank you so much.
same here
Yeah.. the amount of research he is doing for all these vedios are fantastic
Same
I have been watching your vids for 2 years you have helped me through a lot
Omg
I have just found my new favourite You Tube channel, you are a star! I thought, THOUGHT, that I was quite knowledgeable but after spending the entire day over here in the UK watching back to back Tim Dodd videos I realised that I actually knew very little. You are an excellent, amusing and very informative educator Tim. I never, ever watch videos that are longer than about three minutes, until today that was, I've not even used the time stamps once. Superb.
How to get down from orbit:
throw a dice...
...check for dice roll after landing under the seat
because of the nessesarity for gravity and being stationary to complete.
Then proceed with disregarding the result.
I was honestly surprised when I learned that they're de-orbiting using the tiny Draco RCS thrusters, instead of the huge Super-Draco motors.
Especially since now that they're splashing down, the only thing they have the Super-Draco's doing is abort contingencies.
That said, I do appreciate your explanation on the "why" of that answer - it makes sense!
They totally should use super Draco for splash down/ landing softening like on soyuz
@nuff sed In fairness, the way they designed the system both the RCS Draco and the massive SuperDraco use the same fuel reserve.
So I gotta commend them for that.
But still the weight of the engines themselves counts - although it ALSO counts in the competing designs which also use large abort motors that are carried into orbit.
So they went from "really cool idea" to "just like everyone else", which is still a bit of a shame.
I can really recommend the Scott Manley video Tim referred to at the beginning.
I suspect that the overlap between Tim's viewers and Scott's viewers is massive! :)
Thanks Scott.
So much that you can't link it?
@@stonefish98 Not in a youtube comment
The video is called "The Accidental Spacecraft Splashdown Which Almost Killed Its Crew"
1. Click Retrograde
2. Press Z
3. Press Spacebar
4. Wait
But why aren't you thrusters already on??
Great job getting this out on time!
Based on the wikipedia article "dBZ (meteorology)" 25dBZ equates to 1.3mm/h of rain.
I like one of the funny ksp loading screen messages where it says, “Calling orbital mechanic” 😂
Dude hopefully im earlier enough for you to see my comment, i just wanted to say i love your videos!!!! Thank you so much man!!!! 🌎🔥❤
Well he does see your comment
Tim, this was excellent--could be used as an intro at the college level. An ideal mix of science, engineering and enthusiasm!
This video helped answered and explained my questions involved with all the orbital mechanics. Thanks Tim !
As an ABSOLUTE HUGE fan of everything that has to do with space, other planets, stars, black holes, neutron stars and just the universe in general, how am I just finding this channel?
Love rockets, almost as much as i love this channel
Same
Same. I LOVE ROCKETS! USA 🇺🇸
Awww 🥰
Although i knew all the orbital mechanics watching your and scott Manley's video over the past 1 and 1/2 year ,i still watched this video till end because space is fun and watching the same thing over and over isn't boring.thanks for this video
Don't forget Tremor, the space dinosaur ;) Seriously though, praying Bob and Doug get back down to earth, and home to their families, safely and happily!!!!
1:06 that amazing shot Tim on the left, falcon 9 with crew dragon making history in the middle. and a Tesla on the right. one picture carrying some great stuff
is that their names dragon riders i wanna be called a dragon rider
Dragon riding astronauts or Dragonauts!
@Yai Garcia but being a dragon rider sounds so awesome!
Dragon rider is Donkey from Shrek
The capsule was ORIGINALLY called Dragon Rider
@@crugleberryandfriends4740 I didn't know that. Thanks for the nugget of info.
"Theres also an article version of this video"
My boy, it just got real. Always. Always make a written overview of your videos. With the time you spend on them, it will be verrrry beneficial to you in the future as you reference back, and leave us super nerds to find the info ourselves :)
You got it up before the reentry. With only 5 hours to spare
Tim, you have become a must need for any inexperienced scientific person who loved space travel! Thanks !!
These videos are getting ever more professional; all that work on the new studio has paid off.
Point retrograde, fire engines, open parachutes at 3000 and there you go xD
i see your a man of culture as well
@@leriku2270 indeed I am
@@avap0n459 The space capsule equivalent of "pulling at the mastheads"... Nice.
That was right and wrong
Don't forget to eva in the air
GRAPHIC NEEDED!
(Maybe the graphic I propose below already exists, and someone can simply point me to another of Tim's videos.)
Hey Tim,
One thing that I believe isn't generally understood by many of us viewers is the relationship between altitude and orbital velocity. I watched this video after seeing your coverage of the landing of DM-2. Over and over you would talk about how decreasing velocity causes the capsule to come closer to the surface of the Earth without explaining why in an easily understandable way. I think if you created a graphic that shows altitude vs. orbital velocity - rings of different altitudes that show each with a different stable orbital velocity - it would show how decreasing velocity causes the capsule to 'fall" into a lower stable orbit. And that eventually the decreased altitude places the capsule into the thicker parts of the Earth's atmosphere, causing more slowing, causing more falling, etc. This could save a lot of potentially confusing words.
As is often said, a picture is worth a thousand words. I think a well constructed graphic could really decrease a lot of verbal explanation that loses us in the weeds, or in this case, the vacuum of space.
Thanks Tim, for listening, and for all your efforts to keep us in the know about space! :))
I live in portugal, and as of about an hour ago the crew dragon passed over me, i actually got just a frame of crew dragon during THE DAY using my nikon p1000
Wow that's cool! I would love to see that picture (you could post it to reddit ;-)
I would love to see that picture
Ill maybe post it on r/spacex
@@kerbal_madness do that! You'll get my upvote! :)
Thanks!
My first job at Douglas MSSD involved re-entry dynamics and orbital mechanics. The math was really challenging, and very fun.
"Dragonriders" ... I like that! You should @ Elon, asking him to make a custom patch for all astronauts who will ride on Crew Dragon, a patch that proudly declare "Dragonriders"...
Tim, your presentation in this video was exponentially superior to anything that NASA TV has done on this subject. Please keep up the good work! You should be the one on NASA TV.
LOVE your Channel thanks for this amazing content.
So glad you added the small triangle thing next to the timeline, it makes it so much easier to follow
It thought this was an old live stream based off of the thumbnail, I didn't realise it was a video till I checked twitter
This presentation was pure "space- tech" candy to me. Good stuff.
Oh boi,my man is safe.
🥰
You definately deserve more views on this video. This is an awesome explanation of something that people don't really think about, and my opinion is that you've done an awesome job. I really love these kinds of videos.
Why don't they catch Dragon with a ship like Ms.Tree or Ms.Chief?
Maybe the ship can't move fast enough to be at the right spot in the right time (that still can't catch fairings every time, and Dragon would have to land at most a few meters from the center to not make the ship roll), maybe the vertical speed is too high and Dragon would break the net, maybe it would be just too much work to certificate this... idk
11:52 there is such joy in her eyes.
first
(=
GAY
Thanks for the return to making videos again Tim!!
Thank you I was having trouble landing my Capsule on my backyard pool.Appreciate the help!
Can’t get enough of Tim’s space-explanation videos. Love it! Go on !
This channel has been an awesome find for a space nut like me. I love how you break down all the concepts in a simple, easy to understand way. Big up?
I just wanna say that I love aviation and your channel got me into space as well
truly astonishing and comprehensive description, well done, and thanks to your patreon supporters too!
The man did a bloody 30 minute video about what's happening today in no time at all and RELEASED IT THE DAY IT'S HAPPENING.
You're a wizard, Tim. Truly.
Great video, Tim! You answered the questions I had about Dragon 2’s thrusters. Thanks!
If not too much effort can you flash all the metric tech specs in common English specs (exp MPH vs Ft/S). Just a suggestion, I appreciate and respect all your work as presented. Your one the best at what you do. Keep up the excellent work.
the interconnection of the draco and superdraco thrusters is genius... it's safe, efficient, and just slick tbh :)
Great stuff. Don’t forget that you can also steer cross range (sideways) with a blunt body/off center CoM setup. That’s maybe even cooler. :)
When the scrubbed SN5 hop attempts have almost 10x the views of this super cool video :(
I mean, I'm super exited for the SN5 hop, but this video is pure gold of work !
Looking back at this is wild...you will know Exactly what this feels like Tim. Awesome.
I really like that you use metric values
Thank u for the video!!! I was wondering why the time it takes to land can vary so much and why they arent landing using the super dracos instead of splashing down- so this video really helped answer the questions I had about it -Can’t wait for the stream later
I never knew the heat shields were designed with an off-center center-of-mass to provide lift and directional control by spinning the dragon. Really interesting.
Apollo and many others do it too, it's a rather clever but simple strategy to maneuver, it's old but very reliable
@@UNSCPILOT Old but very reliable. Could be the title of my auto-biography.
I'm an Apollo-era kid, so I quickly recognized the F1 engine on your T-Shirt. Now, I must own one. Great video!
Timbo... making complicated science simple for the rest of us. I started watching the video in that, I just woke up, condition. After some coffee went in the gullet, I understood orbital mechanics better, thank you! Mike
Another really great video, Tim! The only thing I'd like to have seen more of was how exactly the phasing burns affect the orbit, but I also get that it's a bit more detail than the scope of this video. Maybe an idea for its own video, or as part of one about interesting orbital mechanics.
I really appreciate the effort you put into these videos if I have a question about something eventually you will answer it period and you have the gift of making it easy to understand. Some videos go into these mathematical formulas of orbital mechanics and most people just don't have the math to do that. You don't feel it's necessary to watch every little thing that happens at Boca Chica period And I totally concur with that him to put it in down-to-earth terms so, you da man
Question! I understand the Draco thrusters are used during the phasing burn. But is that what's actually getting the Dragon to start its downward trek toward earth? Because I see that at some point the Dragon flips so that the heat shield is what burns. But when the heat shield is down,, what's actually creating the momentum for the Dragon to deorbit and fall into the earth's atmosphere?
So about 10:10 p.m. EST last night I got a notification from my phone that the ISS was passing overhead. I went out to look and it was very bright (magnitude -4 according to the app I was using). What's cool is that there was a little dot In front of the ISS perfectly matching its trajectory. I am fairly sure that this was the SpaceX Dragon capsule that had just undocked from the ISS a short while before.
Super awesome informative video. You're the best.
Like you said it takes 15 minutes to de-orbit the capsule. That's why they jettisoned the trunk first because now it lowers the total mass of the vehicle that the thrusters have to deorbit. If they did not jettison the trunk it would require more fuel and more time to do the deorbit burn. If it takes too much time they might have to do another phasing burn
LIVED IN ORLANDO FOR 20 YEARS, SEEN HUNDREDS OF LAUNCHES. SEPT 4 2023...12 AM..
SAW MY FIRST CAPSULE COME BACK THROUGH THE ATMOSPHERE COOLEST THING IVE EVER SEEN.
They drop the trunk before deorbit burn because if the trunk doesn't detach properly they'll lose the capsule on re-entry.
That makes sense. I would have guessed slowing it down would just cost additional fuel.
Exactly. If they dropped the trunk afterwards, and the explosive bolts failed, the craft is now unstable in the heatshield first orientation, subjecting the craft to a nose/hatch first reentry. That capsule would begin breaking up due to thermal stress after just a few seconds of this. With their current methodology, if the stage separation fails, they have time to do a number of things, including an EVA to manually separate the service module, or return to the ISS and await rescue.
So glad you are focusing on metric units nowadays.
Great program Tim, perfectly explaining everything relating to Re-entry. I feel as if I am now a semi-expert. Great work and thanks. Hope you can do many, many more such programs. Cheers, Brian
I love this channel and can’t get enough, I have questions, what is this craft made of, I’m well aware of metal kindling temperatures
- steel 1600 degrees
- aluminum 660 degrees
- Magnesium 650 degrees
How is this craft resisting 1900 degrees for over 6 minutes without melting into molten metal? Also how does this craft plot a route back to Earth as is clearly spinning at approximately 1000 miles per hour? Please excuse my ignorance on the subject, I don’t know much about it, but fascinates me. Keep up the great work. Cheers!
First time here Tim and I need to say that I loved your video. You have a new subscriber. Great Job!
So why did SpaceX choose a splash down style landing over a ground landing like Boeing? Sorry if you've answered this in another video. I've been looking for an answer and haven't quite found it yet. Thanks man, keep up the great work!
Released just in time, you guys are ambitious!
One question: it's geo-stationary reentry possible? At low speed? To avoid extreme heat. Or you'd bounce in atmospheric layers?
How nice it was to watch today, I'll never forget it
Great job Tim!! Very informative and really makes the de-orbit process easier to understand.
I am humbled and amazed by all you do. Nerd to expert in no time.
Thank you I've been stuck up here in space for a long time now I can land!
Ads: I know that your shows need sponsors to be sustainable, and normally the ads that can be cancelled after a few seconds do not seem a burden to me. I sometimes even watch them. However, the “cancel all ads” offer that came on near the end of the show (just before the kerbal part) was not user friendly, and I got lost trying to get back to the show. This caused me to miss about 5 minutes of the show, and I was so frustrated that I did not watch the rest. Normally, I love your shows, so I want to give you this feedback in hopes that you can get this algorithm back to a normal user experience for me. I’ll get over it, and I still give you a thumbs up for this show. Please keep up the good work.
The Scott Manley video (mentioned at 2:47) is called "The Accidental Spacecraft Splashdown Which Almost Killed Its Crew"
Superb video. Please do not quit. Question for you is what is happening to the parachute after recovery? Will they be reuses?
Thanks for the great video again
Hey Tim, great job as always, also saw your live stream of the DM2 landing. Well done!
Love the new studio Tim! Video’s awesome too :D can’t wait for SN5 hop
Why is it necessary to keep the nose cone open until just before re-entry?
Every space video I see so special I cannot get enough. Even watch it sometimes and enjoy music while I immerse. New rock and legend rock like deltaparole tool foofighters nirvana and other.
I missed this in my sub feed, glad you mentioned it in the splashdown stream!
I recall reading that the Apollo capsule had it’s capsule angle shape because had it had been any taller, heat during reentry would have burned the upper half because of entry airflow.
So much info in your video I can't wrap my head around it.. Thank you for all your work
Tim, Nice episode, great graphics as usual. Tangents can be distracting but they did not go too long. Clearly, the ability to have scheduled space flight will be dependent upon having shuttle type vehicles with good cross-range flight characteristics and less strenuous passenger g-loads. Maybe in a 100 years.
I enjoyed that presentation/explanation of the process of getting back to earth from near-earth orbit. It does leave me with a question, though: If the capsule is entering the atmosphere at about 10 times the speed of a bullet, why not use the super-dracos to do a deceleration burn prior to the de-orbit burn, thus decreasing the dynamic pressure/heat load as the capsule reenters the atmosphere? It seems you would still be able to maintain enough speed to control the capsule's trajectory on reentry, and if the heat/plasma buildup was somewhat lessened, the heat shield would also have a longer lifespan. Not to mention the fact that less heat buildup on reentry would significantly improve the odds of survivable reentry and landing (i.e. shuttle Columbia). Thoughts?
I just love this man and how he explains things so simply
The level of safety that SpaceX and the Orion capsule are being held to is eye opening. Makes me wonder what else NASA was kinda deciding not to check or change on the shuttle just to keep the budget.
Hey Tim, I really think you should do a video about Lunar Gateway, that would be pretty interesting!
Note that prior to STS 107, the space shuttle was used for crew changes to Mir and later ISS, with astronauts or cosmonauts returning from long-duration missions needed assistance to disembark.
Seeing tim answer comments makes me happy.
I learned alot from your video. Especially regarding orbital mechanics. Thank you and enjoy the slash down.