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SpaceX

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Re: THE Laws of Thermodynamics Thread (merged)

Unread postby radon1 » Tue 27 Aug 2019, 07:51:18

Liquid rocket fuels have historically been lethally poisonous and quickly vaporizing, and thus required regular re-fueling with lots of special equipment at the stationary silos. Possibly, this has changed now.
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Re: THE Laws of Thermodynamics Thread (merged)

Unread postby dissident » Tue 27 Aug 2019, 13:17:06

radon1 wrote:Liquid rocket fuels have historically been lethally poisonous and quickly vaporizing, and thus required regular re-fueling with lots of special equipment at the stationary silos. Possibly, this has changed now.


You are implicitly talking about hydrazine. But the point of using this toxic fuel was precisely to not have to refuel ICBMs all the time. This liquid fuel could sit inside the silo ICBM tanks for decades. By contrast cryogenic fuels such as LOX and LH cannot be used until just before the rocket flight. This is especially true of LH since it leaks like there is no tomorrow through nanofractures and even "tight" valves. Other gases do not have this problem.

Ilon Musk is a snake oil salesman and all the focus this showboater gets is unwarranted. I would rather pay attention to Blue Origin.
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Re: THE Laws of Thermodynamics Thread (merged)

Unread postby GHung » Tue 27 Aug 2019, 17:44:35

dissident wrote:
radon1 wrote:Liquid rocket fuels have historically been lethally poisonous and quickly vaporizing, and thus required regular re-fueling with lots of special equipment at the stationary silos. Possibly, this has changed now.


You are implicitly talking about hydrazine. But the point of using this toxic fuel was precisely to not have to refuel ICBMs all the time. This liquid fuel could sit inside the silo ICBM tanks for decades. By contrast cryogenic fuels such as LOX and LH cannot be used until just before the rocket flight. This is especially true of LH since it leaks like there is no tomorrow through nanofractures and even "tight" valves. Other gases do not have this problem.

Ilon Musk is a snake oil salesman and all the focus this showboater gets is unwarranted. I would rather pay attention to Blue Origin.


Wow! You are WAY behind on that one. I just watched (about 15 minutes ago) the SpaceX Star Hopper do what NASA and just about every other space agency/company has only dreamed of for decades: Launch a rocket in controlled flight, hover, move to a landing pad, and set down gently as pretty as you please.
https://www.youtube.com/watch?v=bYb3bfA6_sQ
(Watch the last 3 minutes for the money shot)

Who else is launching rockets to orbit while bringing back first stages to perfect landings at the Cape so they can be easily reused. Who has by far the lowest cost to do so?

Image

Who also has the most powerful operational rocket on the planet?

Image

Who????? SpaceX has successfully launched for governments and private customers. Its latest ISS resupply "Dragon" just departed the space station today, and Spacex is set to put the US back into the business of flying people to space after years of relying on the Russians. Maybe you should take some time to look at their accomplishments before you make yourself look utterly uninformed and/or biased.
When it comes to space flight, SpaceX is kicking just about everybody else's butts. That's not my biased opinion. It's reality.
Who else is also being so open about their failures; not just their accomplishments. It's all here:
https://www.youtube.com/channel/UCtI0Ho ... b67FeUjDeA
Watch every one of these videos and tell me again how "all the focus this showboater gets is unwarranted".

List of past, current and future customers (that's a LOT of "snakeoil" eh?):
https://www.spacex.com/missions
Blessed are the Meek, for they shall inherit nothing but their Souls. - Anonymous Ghung Person
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Re: SpaceX

Unread postby Newfie » Wed 28 Aug 2019, 06:21:52

Following.
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Re: SpaceX

Unread postby dissident » Sat 31 Aug 2019, 12:44:38

Musk fanbois are tiresome. His crew capsule was an epic fail that SpaceX tried to spin as something minor for a few months and then gave up. Landing on barges is not the high tech it is painted to be. Rockets aren't fireworks and can be designed with extremely precise control capability. That is why they can be used to shoot down satellites. The real issue is the longevity of the engines and the tanks. Due to weight savings, they have been historically designed as disposable. For example, landing the tanks several times subjects them to enough stress to create problems from fractures. The metal used is very thin. The same goes for the engines which are not over-designed to reduce weight. So far SpaceX has talked a big deal, but we know nothing about the economics of their "reusable" rockets.

SpaceX (and other companies) is a government welfare project to bootstrap private orbital rocket industry. The taxpayer is going to have to shell out billions of dollars in subsidies for many more years. And nepotist Musk (who bought Solar City because it was run by his relatives) will be taking advantage of this welfare giving the taxpayers much less bang for the buck than is possible.
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