SpaceX (Vol. 2)
Discussion
annodomini2 said:
Burn time is comparable, ~169 secs.
Starship should have ~20% more deltaV than F9 2nd stage, but it needs to be capable of landing.
Superheavy mostly empty will have significantly more surface area than an F9 booster, so maybe they can use more drag due to stainless being more stable than carbon fibre at temperature extremes.
So maybe Superheavy can tolerate a higher re-entry velocity than F9.
I believe this is the idea - lots more energy as it's bigger, but also much more surface area and better material to handle it.Starship should have ~20% more deltaV than F9 2nd stage, but it needs to be capable of landing.
Superheavy mostly empty will have significantly more surface area than an F9 booster, so maybe they can use more drag due to stainless being more stable than carbon fibre at temperature extremes.
So maybe Superheavy can tolerate a higher re-entry velocity than F9.
Should be exciting.
As I understand it, the Starship (i.e. upper stage) will be doing proportionately more of the work that a Falcon 9 upper stage does. Consequently the booster will separate, turn itself around and head home earlier and at a lower velocity than a F9 booster.
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Because the booster will be coming in slower than a Falcon 9 and since it’s built from steel, it can handle the temperatures without a reentry burn. With no reentry burn, they don’t need to carry the fuel for it. Thus saving more launch mass.The desire to save weight on the booster is why it won’t have legs. They have offloaded the recovery mechanism to the launch/recovery tower to this end.
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Because the booster will be coming in slower than a Falcon 9 and since it’s built from steel, it can handle the temperatures without a reentry burn. With no reentry burn, they don’t need to carry the fuel for it. Thus saving more launch mass.The desire to save weight on the booster is why it won’t have legs. They have offloaded the recovery mechanism to the launch/recovery tower to this end.
AW111 said:
Beati Dogu said:
The business end a Super Heavy booster is about 6 times larger than of a Falcon 9.
Do you know how the re-entry mass compares?By comparison the SLS booster, which is comparable size wise, is about 94 tons empty. It is of course a one shot deal and mostly made from aluminium alloy.
Meanwhile, the latest cargo Dragon capsule has departed the ISS now. It was delayed a couple of days due to topical storm Elsa riling up the sea off the US east coast.
Splashdown will be at 11.30 pm on Friday, local time. That’s 4.30 am Saturday, UK time.
Also the new west coast landing ship has arrived at the port of Long Beach, California. It'll likely be in use before the month is out.
Meanwhile, the latest cargo Dragon capsule has departed the ISS now. It was delayed a couple of days due to topical storm Elsa riling up the sea off the US east coast.
Splashdown will be at 11.30 pm on Friday, local time. That’s 4.30 am Saturday, UK time.
Also the new west coast landing ship has arrived at the port of Long Beach, California. It'll likely be in use before the month is out.
Beati Dogu said:
By comparison the SLS booster, which is comparable size wise, is about 94 tons empty. It is of course a one shot deal and mostly made from aluminium alloy.
Meanwhile, the latest cargo Dragon capsule has departed the ISS now. It was delayed a couple of days due to topical storm Elsa riling up the sea off the US east coast.
Splashdown will be at 11.30 pm on Friday, local time. That’s 4.30 am Saturday, UK time.
Also the new west coast landing ship has arrived at the port of Long Beach, California. It'll likely be in use before the month is out.
I know you know this but the SLS core stage is hydrolox (less dense) without a common dome (more of it is air). Super-heavy carries more than 3 times as much fuel and has 9 times as much thrust!Meanwhile, the latest cargo Dragon capsule has departed the ISS now. It was delayed a couple of days due to topical storm Elsa riling up the sea off the US east coast.
Splashdown will be at 11.30 pm on Friday, local time. That’s 4.30 am Saturday, UK time.
Also the new west coast landing ship has arrived at the port of Long Beach, California. It'll likely be in use before the month is out.
Talksteer said:
Beati Dogu said:
By comparison the SLS booster, which is comparable size wise, is about 94 tons empty. It is of course a one shot deal and mostly made from aluminium alloy.
Meanwhile, the latest cargo Dragon capsule has departed the ISS now. It was delayed a couple of days due to topical storm Elsa riling up the sea off the US east coast.
Splashdown will be at 11.30 pm on Friday, local time. That’s 4.30 am Saturday, UK time.
Also the new west coast landing ship has arrived at the port of Long Beach, California. It'll likely be in use before the month is out.
I know you know this but the SLS core stage is hydrolox (less dense) without a common dome (more of it is air). Super-heavy carries more than 3 times as much fuel and has 9 times as much thrust!Meanwhile, the latest cargo Dragon capsule has departed the ISS now. It was delayed a couple of days due to topical storm Elsa riling up the sea off the US east coast.
Splashdown will be at 11.30 pm on Friday, local time. That’s 4.30 am Saturday, UK time.
Also the new west coast landing ship has arrived at the port of Long Beach, California. It'll likely be in use before the month is out.
Methalox for Raptor ratio is around 3.5-3.8:1 Oxygen to methane
Hydrolox is 6-8:1 hydrogen to oxygen
Not space x but could not find another thread, Virgin Galactic are going live on Sunday with SirRB as a member of the crew plus 3 other VG senior people as pax.
Youtube linky
https://www.youtube.com/watch?v=RTpWYWIfP7Y
c.2pm BST.
Youtube linky
https://www.youtube.com/watch?v=RTpWYWIfP7Y
c.2pm BST.
red_slr said:
Not space x but could not find another thread, Virgin Galactic are going live on Sunday with SirRB as a member of the crew plus 3 other VG senior people as pax.
Youtube linky
https://www.youtube.com/watch?v=RTpWYWIfP7Y
c.2pm BST.
I think this is the VG thread, the most recent at any rate.Youtube linky
https://www.youtube.com/watch?v=RTpWYWIfP7Y
c.2pm BST.
red_slr said:
Not space x but could not find another thread, Virgin Galactic are going live on Sunday with SirRB as a member of the crew plus 3 other VG senior people as pax.
Youtube linky
https://www.youtube.com/watch?v=RTpWYWIfP7Y
c.2pm BST.
They're taking a Solid Rocket Booster as part of the crew? Youtube linky
https://www.youtube.com/watch?v=RTpWYWIfP7Y
c.2pm BST.
SpaceX’s new landing ship A Shortfall of Gravitas has been out on sea trials.
Looks pretty sleek and futuristic. It's self propelled, unlike the others, which have to be towed.
Video footage:
https://twitter.com/elonmusk/status/14135986703317...
Looks pretty sleek and futuristic. It's self propelled, unlike the others, which have to be towed.
Video footage:
https://twitter.com/elonmusk/status/14135986703317...
Edited by Beati Dogu on Saturday 10th July 09:58
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