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Old 2020-12-09, 20:08   #1024
James Heinrich
 
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Quote:
Originally Posted by KEP View Post
... Now time to watch some SpaceX and hopefully a 12.5KM hop for starship
Did they reschedule that?
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Old 2020-12-09, 20:21   #1025
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Quote:
Originally Posted by James Heinrich View Post
Did they reschedule that?
Currently SpaceX's YT channel is showing 38 minutes until their start.
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Old 2020-12-09, 21:29   #1026
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Quote:
Originally Posted by James Heinrich View Post
Did they reschedule that?
Not that early, as my message could imply and now unfortunantly a delay, so if it happens at 22:40 UTC, it sure will be too late for me to watch. Dang, we were so close
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Old 2020-12-09, 22:55   #1027
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Certainly worth a watch if you missed it!
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Old 2020-12-09, 23:30   #1028
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Link to today's test.
https://youtu.be/ap-BkkrRg-o?t=6445
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Old 2020-12-09, 23:52   #1029
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What was it that this vehicle was supposed to do? It did not turn out very well from the looks of it.
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Old 2020-12-10, 00:25   #1030
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What was it that this vehicle was supposed to do? It did not turn out very well from the looks of it.
It was supposed to land in the same orientation as it took off. It ran into low fuel pressure. The belly first fall was as planned. The flip to tail end down was as planned. It just didn't slow enough.
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Old 2020-12-10, 00:40   #1031
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From what i wrote to someone on my chat regarding starship sn8.

I design CNC machines
i act as if i know something about hardware design
i do not understand why starship sn8 has inside 1 tube 3 rocket engines
1 shuts down and 2 continue to steer it then moveable in the tube
from engineering viewpoint seen that looks clumsy.

Why not use 1 engine that's moveable?
a) much cheaper
b) easier to bugfix
c) more efficient
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Old 2020-12-10, 01:04   #1032
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Quote:
Originally Posted by diep View Post
Why not use 1 engine that's moveable?
Previous tests were 1-engine versions. The final version will be (I believe) a 6-engine design.
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Old 2020-12-10, 01:12   #1033
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Quote:
Originally Posted by James Heinrich View Post
Previous tests were 1-engine versions. The final version will be (I believe) a 6-engine design.
But only the three that you saw today will be steerable. The other 3 will be optimized for vacuum. Having large engines causes them to be more expensive than a straight scaling would lead you to believe. Also, 1 engine with the thrust of those 3, would no be able to throttle down enough to land. With the Falcon9, they use 9 engines to launch, but only 1 during the landing. And even then they have to wait until very late to use it, otherwise the nearly empty booster would start flying up again.
More small engines allow the craft to loose 1 and still make it to orbit.

Last fiddled with by Uncwilly on 2020-12-10 at 01:14
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Old 2020-12-10, 02:48   #1034
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Quote:
Originally Posted by Uncwilly View Post
It was supposed to land in the same orientation as it took off. It ran into low fuel pressure. The belly first fall was as planned. The flip to tail end down was as planned. It just didn't slow enough.
I watched the latter part of the video. The liftoff seemed slow. I wondered what all the engine misbehavior was about. It definitely hit the ground too hard. I have seen a few of the Falcon 9 first stage landings. Amazing stuff considering how fast it falls.
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