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Launching and landing rockets: A comparison between Blue Origin and SpaceX

82 pointsby kamilszybalskiover 9 years ago

14 comments

benjaminlover 9 years ago
This graphic aptly shows the differences in complexity between the two flight plans, but it doesn&#x27;t show the biggest difference between the two rockets. When the Falcon 9, enters space at the height of 100 km, it is traveling at 5000 km&#x2F;h with 125 metric tons of payload[0]. Blue Origin&#x27;s New Shepard, the best I can tell was traveling at ~0 km&#x2F;h at that height, as it reached apogee at the height of 100.5 km and began falling back to Earth.<p>According to Musk[0], a first stage of a rocket is judged by the energy it can impart to its payload at the standardized height of 100 km. Merely getting to 100 km is the easy part. The Falcon 9 is able to deliver 120 giga-joules to its payload at the height of 100 km, while performing a return to launch site landing. While it appears the New Shepard had ~0 joules left at 100 km.<p>[0] - <a href="http:&#x2F;&#x2F;www.spacex.com&#x2F;news&#x2F;2015&#x2F;12&#x2F;21&#x2F;background-tonights-launch" rel="nofollow">http:&#x2F;&#x2F;www.spacex.com&#x2F;news&#x2F;2015&#x2F;12&#x2F;21&#x2F;background-tonights-la...</a><p>[1] - <a href="https:&#x2F;&#x2F;www.blueorigin.com&#x2F;news&#x2F;news&#x2F;blue-origin-makes-historic-rocket-landing" rel="nofollow">https:&#x2F;&#x2F;www.blueorigin.com&#x2F;news&#x2F;news&#x2F;blue-origin-makes-histo...</a>
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nanofortnightover 9 years ago
A more apt comparison is this: A single SpaceX F9 rocket can lift <i>three</i> Blue Origin New Shepards <i>into orbit</i> at 200km altitude (vs merely touching space at 100km) and then <i>come back to land</i>.
cowkingdeluxeover 9 years ago
Here&#x27;s a size difference comparison as well: <a href="http:&#x2F;&#x2F;i.imgur.com&#x2F;g2VIKVC.jpg" rel="nofollow">http:&#x2F;&#x2F;i.imgur.com&#x2F;g2VIKVC.jpg</a>
smackfuover 9 years ago
So it turns out that guy messed up the SpaceX plot (the distance downrange was doubled), and posted a corrected one to reddit: <a href="http:&#x2F;&#x2F;i.imgur.com&#x2F;Z81NgAk.png" rel="nofollow">http:&#x2F;&#x2F;i.imgur.com&#x2F;Z81NgAk.png</a>
hiccupover 9 years ago
Jeff Bezos: &quot;... Welcome to the club!&quot; <a href="https:&#x2F;&#x2F;twitter.com&#x2F;jeffbezos&#x2F;status&#x2F;679116636310360067" rel="nofollow">https:&#x2F;&#x2F;twitter.com&#x2F;jeffbezos&#x2F;status&#x2F;679116636310360067</a>
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exabrialover 9 years ago
I&#x27;m curious, why does the falcon reverse course after having so much lateral velocity? Why not launch somewhere in Arizona and land in Texas or Florida?
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bryanlarsenover 9 years ago
It&#x27;s also a great illustration why SpaceX landing on land requires substantially more reserve fuel than a barge landing. (look at the length of the burn at apogee)
bobalouie1-_over 9 years ago
For those trying to figure out the importance of who did what first please read . <a href="http:&#x2F;&#x2F;www.theverge.com&#x2F;2015&#x2F;11&#x2F;24&#x2F;9793220&#x2F;blue-origin-vs-spacex-rocket-landing-jeff-bezos-elon-musk" rel="nofollow">http:&#x2F;&#x2F;www.theverge.com&#x2F;2015&#x2F;11&#x2F;24&#x2F;9793220&#x2F;blue-origin-vs-sp...</a>
bobalouie1-_over 9 years ago
Please read this Trisell and others who are so concerned about who did what first. <a href="http:&#x2F;&#x2F;www.theverge.com&#x2F;2015&#x2F;11&#x2F;24&#x2F;9793220&#x2F;blue-origin-vs-spacex-rocket-landing-jeff-bezos-elon-musk" rel="nofollow">http:&#x2F;&#x2F;www.theverge.com&#x2F;2015&#x2F;11&#x2F;24&#x2F;9793220&#x2F;blue-origin-vs-sp...</a>
Shish2kover 9 years ago
A somewhat tangential question I&#x27;ve had since seeing the landing -- why are these rockets trying to land by themselves, which seems really difficult, compared to say getting the rocket <i>roughly</i> in the right place and then having a robotic arm attached to the ground reach out and grab them?
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anovikovover 9 years ago
What about hard numbers? Anyone has delta-v figures for first stage ascent, velocity both vertical and lateral components at meco, and delta-v for boostback, entry, and landing burns?
IshKebabover 9 years ago
This is pretty cool. Is the first stage trajectory to scale here?
Overtonwindowover 9 years ago
Dear Jeff Bezos: Suck it.<p>Sincerely, Science
Trisellover 9 years ago
The problem that SpaceX has is that Blue Origin did it first. Even if the technical challenges were larger for SpaceX then Blue Origin.<p>In the mind of the general public that cares, it&#x27;s all the same thing. The technicalities of a suborbital flight of a small capsule verses an orbital flight carrying a payload is meaningless. They just saw the Blue Origin rocket do it, and then the SpaceX rocket do it, and they looked about the same.
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