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"NASA has certified the current version of the SpaceX Falcon 9 to launch some categories of science missions" If I have understood correctly...
I don't think I have called Amos 6 as a launch failure. I know my English is bad, but I am careful with key words. I will be calling it failure...
No I didn't. I don't know much about manufacturing. So I'll try to compare how complex products are. I think Elon said 10* production rate cut...
6 M$ for fairing makes it roughly as expensive as 2.stage. Merlin must be much cheaper than 6 M$, because F9 has 10 Merlins. So I have trouble...
Amos 6 failure happened during preparation for launch not during launch. If I'm hired to move a piano and I break it while backing it for...
As I understand this: Precession rate depends on altitude. Change of altitude will change orbital plane relative to satellites on different...
Acceleration (trust) of ion drive is limited by available power. These satellites might have rather large solar panels anyway. Dawn used ion...
I think they have 2 failures, because they have lost main cargo twice. 25 launches without issues is a reason to celebrate.
I don't see large calculation errors (didn't check small ones:) Are you planning 2. stage with larger propellant tanks? I don't think SpaceX...
After thinking this (and sleeping), I decided my first idea is correct. Change of orbital plane requires change in direction of velocity even if...
My first thought: No, it takes too much delta-v to change between LEO orbital planes. Fully reusable F9 would be good. Before posting I thought...
I did read Technical Attachment:) "Each satellite in the SpaceX System is designed for a useful lifetime of 5 to 7 years." So they need to get...
Extinction causing asteroids are rare. Planet sterilizing even more rare. But city killer size asteroids come once in 100 - 200 years. For...
Of course there is. My purpose was to find order of magnitude. So what is wrong with this: Last change to orbit was made close to Earth, so...
I agree, but I still think 2. stage is much more complex. Aerodynamic forces attacking fairing will be passed to 2. stage. It also has a rocket...
Electric motor might crash to surface of Earth, everything else only to atmosphere with speed about 15 km/s. Unless it comes in almost...
It needs to be strong. It needs to reliably separate from rocket. It is relatively simply compared to 2. stage. Mass in 2. stage is more...
Yes, because they are developing recovery. I don't know why. It is very large. It must be very light and rather strong. Perhaps it is hand made...
Don't wait too long: What now for SpaceX's Mars-bound Telsa Roadster? Very simple calculation shows it will probably crash into Earth in 100 000...
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Not many free parking places. Perhaps 1/3.
Since BFS could reach orbit without booster (and cargo), it could reach Florida also. But would SpaceX get landing permissions? Usually rockets...
From Grendals post: Elon, when asked about improving the second stage: "Under consideration. We’ve already stretched the upper stage once. Easiest...
OK. Give them opposable thumbs and neocortex equivalent. Without space program their civilization would have collapsed anyway. Then small...
If you deliberately spill RP-1 into sea here, you will be fined. With large spill you could end up in prison. I don't think local law even knows...
Kessler syndrome is serious issue on high orbits, but it is not a problem on LEO. Read wiki page you linked.
Since orbit intersects Earths, it will come back eventually. But not soon since Earth is very small target. Very quick calculation: It will come...
What do you think RP-1 - Wikipedia is?
Dinosaurs died because they did not have space program. Extinction size asteroids are of course rare. City killer size asteroids come once in...
Roadster goes 243 / 142.0 = 1.71 times as far as Mars from the Sun. (Using numbers from your post.) I understood that orbit is tilted, so it...
I don't believe it is bulletproof. Difficult part is to recover oil in it.
F9 is not designed to survive force of waves. If fuel tank survives waves, small handgun is enough to sink it. Problem is small amount of fuel...
I liked it. Moon base will be for science, mining and hotel for rich, but it is necessary before any real colonization.
Air pressure at F9 1. stage separation is so low that liquids boil as in vacuum. Extra altitude will make no difference.
Youtuber published on Feb 6, 2015 new version of that car landing video: ______________________******* [MEDIA]
Why did it happen on two engines, but on one? Random event seems unlikely. Perhaps human error: It was prepared for single engine landing.
Weird! Your message claims to quote mine, but quotes ccutrer's message. (406) I thought Roadster's orbit would stay between orbits of Mars and...
Elon in upper video: "It will be coasting for 6 hours" When engine stops last time, orbit cannot be changed. It will travel 6 h away for Earths...
Yes, I admit rocket + wings is not practical. Stratolaunch disagrees: [MEDIA] "We are excited to report all objectives of this test were...
Replies to Discussion of Numerical Punctuation Mg is official SI unit: International System of Units - Wikipedia versions of ton are not. My...
Lack of cargo space limits FH capacity to low orbit. For high orbits, Moon and planets it has enough cargo space. SpaceX has not yet saved...
But it is not dead. Wikipedia: A second airframe with a slightly different configuration[1] was partially built. Its construction was halted in...
I don't see any reason to call FH a weak idea. I can imagine good reasons why it is late: F9 has been developed to carry much heavier loads, so...
That does not prove their idea was bad (perhaps it was, I don't know). They incorrectly assumed they can get more investor money without prototype.
Empty 1. stage of BFR weights about 150 t. Antonov An-225 Mriya - Wikipedia can take 200 t external load. Cargo hold is 6.4 m (21 ft 0 in) wide....
Less propellant is needed. Risk is higher, because burn is started at low altitude. Dry mass: 22.1t Thrust 3*420 kN Over 5 g deceleration...
Lunar eclipse lasted 76 min. That is about 1/500 of a month, so Moon is at perigee during 1 out of 500 eclipses. Partial eclipse lasted 3:23....
Perhaps they tested shorter re-entry burn or none and did not expect it to survive.
Moon at perigee and a total lunar eclipse same time is rare. Moon looks larger at perigee, but difference is not enormous. I haven't checked, but...
Studying google.maps: Houses behind antennas are Boca Chica Village, Texas - Wikipedia Those houses will not be expensive problem for SpaceX.