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#202 |
Penultimate Amazing
Join Date: Nov 2006
Posts: 14,185
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#203 |
Penultimate Amazing
Join Date: Oct 2012
Location: Nelson, New Zealand
Posts: 23,587
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Nope.
The "entry burn" is peculiar to Falcon 9 first stage boosters. Cold-gas thrusters orient the stage tail first, then as it begins to enter the atmosphere the booster stage accelerates under the pull of gravity. Then, three of the Falcon 9's engines light up for the entry burn, the purpose of which is to keep the booster speed from increasing to the point that the convective and radiative heat of re-entry will damage the engine end of the booster. Starship will begin its entry in much the same way as the Shuttle Orbiter, there will be a retro (oe re-entry) burn in orbit to slow it down enough to fall into a ballistic trajectory for re-entry but that is not the same as the Falcon 9's entry burn, it is for an entirely different reason. |
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What is Woke? It is a term that means "awakened to the needs of others". It means to be well-informed, thoughtful, compassionate, humble and kind. Woke people are keen to make the world a better, fairer place for everyone, But, unfortunately, it has also become a pejorative used by racists, homophobes and misogynists on the political right, to describe people who possess a fully functional moral compass. |
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#204 |
Penultimate Amazing
Join Date: Nov 2006
Posts: 14,185
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So that might be a semantic issue. There is still a burn for both cases but in one case it's just to de-circularize the orbit, in the other case it's to counteract a lot of kinetic energy?
So I'm guessing the current round of tests don't yet include a heat shield. |
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#205 |
Penultimate Amazing
Join Date: Oct 2012
Location: Nelson, New Zealand
Posts: 23,587
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I wouldn't call it semantic - these are genuinely different burns for completely different reasons.
SpaceX are testing heat shield tiles in patches on the hulls of these test articles, not so much for their integrity as heat shields, but to test methods of attachment, and how well they stand up to the forces involved. Unlike the Shuttle Orbiter tiles in which every one of the tiles was unique to the position in which it was located, these are generic and interchangeable. Here some photos (by Mary, a.k.a bocachicagal) showing SN9 and SN10 on the pad - the black patches are the TPS tiles ![]() ![]() |
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What is Woke? It is a term that means "awakened to the needs of others". It means to be well-informed, thoughtful, compassionate, humble and kind. Woke people are keen to make the world a better, fairer place for everyone, But, unfortunately, it has also become a pejorative used by racists, homophobes and misogynists on the political right, to describe people who possess a fully functional moral compass. |
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#206 |
Fiend God
Join Date: Oct 2005
Location: In a post-fact world
Posts: 96,875
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#208 |
Master Poster
Join Date: Oct 2005
Location: Oregon, USA
Posts: 2,258
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__________________
Knowing that we do not know, it does not necessarily follow that we can not know. |
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#210 |
Master Poster
Join Date: Oct 2005
Location: Oregon, USA
Posts: 2,258
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Did you believe you're more than just friends?
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Knowing that we do not know, it does not necessarily follow that we can not know. |
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#211 |
Director of Hatcheries and Conditioning
Join Date: Jul 2002
Location: Waiting for the pod bay door to open.
Posts: 45,249
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The explosion wasn't as spectacular?
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Continually pushing the boundaries of mediocrity. Everything is possible, but not everything is probable. “Perception is real, but the truth is not.” - Imelda Marcos |
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#212 |
Observer of Phenomena
Pronouns: he/him Join Date: Feb 2005
Location: Ngunnawal Country
Posts: 82,020
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I haven't had a chance to see the video yet - was it a full geobraking situation or did it sit for a while before exploding like that other time?
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Слава Україні! Героям Слава! 20220224 - 20230224 |
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#213 |
Penultimate Amazing
Join Date: Nov 2003
Location: Port Townsend, Washington
Posts: 36,519
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__________________
Cum catapultae proscribeantur tum soli proscripti catapultas habeant. |
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#214 |
Philosopher
Join Date: Jul 2011
Location: Colorado
Posts: 5,386
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The only video I've yet seen was nothing. Literally. The cameras on the rocket itself cutout just as the engines were igniting for the landing burn. Everything else obscured by fog. Thick, thick fog, it didn't seem to be visible from the ground.
Maybe other ISF'ers have seen good video, but I have not. |
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#215 |
Penultimate Amazing
Join Date: Nov 2003
Location: Port Townsend, Washington
Posts: 36,519
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A good video of the actual explosion? No, due to the fog. Cameras cut out due to the explosion. But this one from NSF is pretty good in showing the flash and rain of debris.
If I'm the FAA, I won't be allowing them to launch in those conditions again. ETA: Watch the yucca on the left, whose flower spike had not fully opened yet and now never will. |
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Cum catapultae proscribeantur tum soli proscripti catapultas habeant. |
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#216 |
Observer of Phenomena
Pronouns: he/him Join Date: Feb 2005
Location: Ngunnawal Country
Posts: 82,020
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Слава Україні! Героям Слава! 20220224 - 20230224 |
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#217 |
Graduate Poster
Join Date: Dec 2009
Location: UK
Posts: 1,912
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Elon replied to Spacex360 on Twitter:
Quote:
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#218 | |||
Director of Hatcheries and Conditioning
Join Date: Jul 2002
Location: Waiting for the pod bay door to open.
Posts: 45,249
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Spacex chosen for next moon missions. |
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Continually pushing the boundaries of mediocrity. Everything is possible, but not everything is probable. “Perception is real, but the truth is not.” - Imelda Marcos |
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#219 |
Fiend God
Join Date: Oct 2005
Location: In a post-fact world
Posts: 96,875
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#220 |
Director of Hatcheries and Conditioning
Join Date: Jul 2002
Location: Waiting for the pod bay door to open.
Posts: 45,249
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Spacex is cheaper. There that.
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__________________
Continually pushing the boundaries of mediocrity. Everything is possible, but not everything is probable. “Perception is real, but the truth is not.” - Imelda Marcos |
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#221 |
Fiend God
Join Date: Oct 2005
Location: In a post-fact world
Posts: 96,875
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#222 |
Penultimate Amazing
Join Date: Jun 2010
Posts: 43,373
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It's nothing new.
Apollo Lander was designed and built by Grumman. Contracting to a specialist company is a good idea. |
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#223 |
Fiend God
Join Date: Oct 2005
Location: In a post-fact world
Posts: 96,875
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I'm aware of that.
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#224 |
Penultimate Amazing
Join Date: Nov 2006
Posts: 14,185
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#225 |
Fiend God
Join Date: Oct 2005
Location: In a post-fact world
Posts: 96,875
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#226 |
Penultimate Amazing
Join Date: Oct 2012
Location: Nelson, New Zealand
Posts: 23,587
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SN15 due to attempt its 10Km flight and then try to stick the landing in about 11˝ to 12 hours time.
However chances look grim. I've checked LabPadre's NerdleCam and at 4:45 am the weather at Boca Chica looks crap - 15 knot winds (29kph) and its pissing with rain. Unless there is a dramatic improvement, I can't see it happening. |
__________________
What is Woke? It is a term that means "awakened to the needs of others". It means to be well-informed, thoughtful, compassionate, humble and kind. Woke people are keen to make the world a better, fairer place for everyone, But, unfortunately, it has also become a pejorative used by racists, homophobes and misogynists on the political right, to describe people who possess a fully functional moral compass. |
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#227 |
Penultimate Amazing
Join Date: Nov 2006
Posts: 14,185
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What would you have said about the heavy fog they launched in not too long ago?
ETA: Appears to be clear weather now? Another ETA: https://www.youtube.com/watch?v=rXG7W7skekw Clear skies. On second thought, actually looks like high clouds, narrators are expressing concern about weather. |
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#228 |
Penultimate Amazing
Join Date: Nov 2006
Posts: 14,185
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Haven't been following closely, but appears to be scrubbed.
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#230 |
Penultimate Amazing
Join Date: Nov 2003
Location: Port Townsend, Washington
Posts: 36,519
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Not worth a proper poll, but what's your bet?
A) Scrubbed, weather B) Scrubbed, other C) Blows up on launch D) Lands hard, blows up E) Blows up mid-air F) Lands, blows up after G) Lands, mission success! |
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Cum catapultae proscribeantur tum soli proscripti catapultas habeant. |
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#233 |
Penultimate Amazing
Join Date: Nov 2003
Location: Port Townsend, Washington
Posts: 36,519
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Appears to probably have been weather.
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Cum catapultae proscribeantur tum soli proscripti catapultas habeant. |
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#234 |
Penultimate Amazing
Join Date: Oct 2012
Location: Nelson, New Zealand
Posts: 23,587
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__________________
What is Woke? It is a term that means "awakened to the needs of others". It means to be well-informed, thoughtful, compassionate, humble and kind. Woke people are keen to make the world a better, fairer place for everyone, But, unfortunately, it has also become a pejorative used by racists, homophobes and misogynists on the political right, to describe people who possess a fully functional moral compass. |
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#235 |
Penultimate Amazing
Join Date: Oct 2012
Location: Nelson, New Zealand
Posts: 23,587
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Propellant load is happening now, and they are about 7 minutes or so from launch
Tim Dodd (Everyday Astronaut) live feed here https://www.youtube.com/watch?v=htnG_mABtSQ And its away!!! |
__________________
What is Woke? It is a term that means "awakened to the needs of others". It means to be well-informed, thoughtful, compassionate, humble and kind. Woke people are keen to make the world a better, fairer place for everyone, But, unfortunately, it has also become a pejorative used by racists, homophobes and misogynists on the political right, to describe people who possess a fully functional moral compass. |
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#237 |
Penultimate Amazing
Join Date: Oct 2012
Location: Nelson, New Zealand
Posts: 23,587
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And it stuck the landing!!
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__________________
What is Woke? It is a term that means "awakened to the needs of others". It means to be well-informed, thoughtful, compassionate, humble and kind. Woke people are keen to make the world a better, fairer place for everyone, But, unfortunately, it has also become a pejorative used by racists, homophobes and misogynists on the political right, to describe people who possess a fully functional moral compass. |
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#238 |
Philosopher
Join Date: Jul 2011
Location: Colorado
Posts: 5,386
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Still on fire.
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#240 |
Penultimate Amazing
Join Date: Oct 2012
Location: Nelson, New Zealand
Posts: 23,587
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They're detanking, so the fire must be out now
ETA: Musk tweets "Flaming nominal" |
__________________
What is Woke? It is a term that means "awakened to the needs of others". It means to be well-informed, thoughtful, compassionate, humble and kind. Woke people are keen to make the world a better, fairer place for everyone, But, unfortunately, it has also become a pejorative used by racists, homophobes and misogynists on the political right, to describe people who possess a fully functional moral compass. |
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