SpaceX is going for its 75th Falcon 9 launch today. https://www.youtube.com/watch?v=pIDuv0Ta0XQ&feature=emb_logo …
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By some measures, the Falcon 9 v1.2 rocket is now tied with the Atlas V booster as the most reliable rocket in the world. http://www.spacelaunchreport.com/log2019.html
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Antwort an @SciGuySpace
How do you figure that? Two F9s have blown up.
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Antwort an @cbs_spacenews
The Space Launch Report methodology is on their site. Basically, v 1.2 hasn't blown up in flight.
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Antwort an @SciGuySpace @cbs_spacenews
Yeah, if you count only v1.2 onwards it's 68 of 68 successes (with Heavy). On the other hand the last 70 Atlas 5s have been 100% successful too. Overall I rate F9 as 98.5% successful over 78 launches and Atlas5 as 99.7% successful over 80 launches.
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Also it would be 58/58 launches of v1.2 on, so even better for Atlas V by count I guess if you go that route.
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Yes, I failed to subtract 20 correctly. Sigh.
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Antwort an @planet4589 @immabed und
My ad hoc methodology if there hasn’t been a failure in a while is to look at number of sequential successes. Also, I don’t count the Cygnus hiccup against AV for purposes of crew safety (altho it’s a “near miss”). By that count, F9 hasn’t exceeded Atlas V yet but will in ~2 yrs.
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Antwort an @Robotbeat @planet4589 und
Also in my informal method, since launch vehicles are supposed to get better w/ time, I assume if a launch vehicle has had 50 consecutive successes, it’ll likely be another 50 before a failure, so rate is ~99%. If a vehicle has never failed, it still therefore gets half a failure
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Antwort an @Robotbeat
Remind me what the 'Cygnus hiccup' was?
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Cygnus CRS OA-6 in March 2016; the Atlas V 1st stage shut down early and the Centaur barely managed to compensate.
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Antwort an @Cosmic_Penguin @Robotbeat
Right, I forgot. Yeah, I don't count that against Atlas - because you don't know how many other 'near misses' rockets had that didn't manifest so visibly.
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Antwort an @planet4589 @Cosmic_Penguin
A lot of folks consider it a partial failure, which I think is fair. If it had been a geosynchronous satellite, it would’ve been toast. But for crew safety, I think it would’ve been safe.
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