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Post by dan1 on Dec 8, 2020 22:25:44 GMT
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Post by dan1 on Dec 8, 2020 22:45:00 GMT
Scrubbed for the day
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registerme
Member of DD Central
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Post by registerme on Dec 9, 2020 10:17:29 GMT
1.03 seconds from launch.
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Post by dan1 on Dec 9, 2020 12:03:03 GMT
1.03 seconds from launch. Understandable for an experimental engine & platform. The Raptor engines are the first full flow staged combustion engines to see flight and they're attempting to control three of them in this particular Starship (SN8). I'm enthused by the engineering as I am by the electric pump design (3D printed IIRC) on the Rutherford engines used in the Rocket Lab Electron rockets. Rocket Lab are currently experimenting with reusing their first stage Electron by deploying a parachute which is then snagged by a waiting helicopter - all to avoid salt water ingress. A nice diversion from the reality of Covid & Brexit Hope they will try again today (launch window closes at 11pm tonight).
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Post by dan1 on Dec 9, 2020 20:59:54 GMT
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Post by dan1 on Dec 9, 2020 23:03:31 GMT
It actually launched Whizz to the end...
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littleoldlady
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Running down all platforms due to age
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Post by littleoldlady on Dec 10, 2020 8:23:54 GMT
Went great until the end. Was it supposed to land - or just crash as it did?
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registerme
Member of DD Central
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Post by registerme on Dec 10, 2020 10:57:50 GMT
Went great until the end. Was it supposed to land - or just crash as it did? It was supposed to land, and that's what the test was for. Ahead of time Musk put the odds of success at 1/3. It's an expensive hobby!
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Post by dan1 on Dec 10, 2020 15:21:17 GMT
Went great until the end. Was it supposed to land - or just crash as it did? This was the explanation for the Rapid Unplanned Disassembly (RUD): Header tanks for propellant/fuel (liquid methane) and liquid oxygen supply the engines on descent (not enough propellant by the sounds!). The main CH4 + LOX tanks require gravity to provide the pressure on ascent I believe. A very cool video of the landing burn, flip + bust:
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littleoldlady
Member of DD Central
Running down all platforms due to age
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Post by littleoldlady on Dec 10, 2020 16:49:41 GMT
The commentator on the link given above seemed to think that the ascent burn went on much longer than he thought it would. If that is the case it might explain why there was not enough fuel for a soft landing.
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Post by dan1 on Dec 10, 2020 17:12:12 GMT
The commentator on the link given above seemed to think that the ascent burn went on much longer than he thought it would. If that is the case it might explain why there was not enough fuel for a soft landing. As far as I know the header tanks used for the landing burn are isolated from the main tanks used for the ascent (obviously connected to the same engines via valves/diverters and wot not). I assume the rocket reached terminal velocity on the freefall so the fact it may have flown higher should make no difference. I think the comment about the longer ascent burn may be because they didn't switch all three engines off at once but throttled back by shutting down one engine then another and finally the third prior to reaching apogee. That takes a little longer.
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Post by Ton ⓉⓞⓃ on Dec 11, 2020 22:30:55 GMT
The commentator on the link given above seemed to think that the ascent burn went on much longer than he thought it would. If that is the case it might explain why there was not enough fuel for a soft landing. As far as I know the header tanks used for the landing burn are isolated from the main tanks used for the ascent (obviously connected to the same engines via valves/diverters and wot not). I assume the rocket reached terminal velocity on the freefall so the fact it may have flown higher should make no difference. I think the comment about the longer ascent burn may be because they didn't switch all three engines off at once but throttled back by shutting down one engine then another and finally the third prior to reaching apogee. That takes a little longer.
It was falling "sideways" so that must've created a lot of drag, so perhaps not as fast as it might have fallen. But the retro rockets seemed to only work on the lowest side(?) so yes gravity looks to be paying it's part.
When it was ascending there seemed to be a fairly bad case of "kangaroo juice" at 50secs. followed by what looked like a flame out at around 1min and another later on. The engines centred up nicely though after each. (All technical terms)
One controller seemed to say awhile after it RUDded, " ##### incredible work ### nice work ####"
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Post by dan1 on Dec 24, 2020 9:31:42 GMT
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ozboy
Member of DD Central
Mine's a Large One! (Snigger, snigger .......)
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Post by ozboy on Dec 24, 2020 11:56:28 GMT
Anyone else noticed it's not a sleek "NASA" type rocket, but shaped more like something out of an old Flash Gordon movie?!!
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Post by spareapennyor2 on Dec 24, 2020 12:17:58 GMT
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