12-14-2023, 08:10 PM | #757 |
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Destin from SmarterEveryDay in his lecture to NASA discussed how the engineers from the 60's laid the groundwork and wrote the playbook for going to the moon, but what about mars? I ask because this video seems to show rockets launching fuel tanks into LEO to randevu with the primary ship, which is the plan for the moon, so we can practice for mars, and also so we can get larger payloads to the moon like we need to do for mars. Again, it's complicated because it is going to be complicated when we go to mars.
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12-14-2023, 08:11 PM | #758 | |
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I do understand the orbit a bit better now tough. Thanks for that.
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Visit my Owner's Journal where I wax philosophic on all things FR-S Post your 86 or see others in front of a(n) (in)famous landmark. What fits in your 86? Show us the "Junk In Your Trunk". Last edited by Dadhawk; 12-15-2023 at 08:17 AM. Reason: corrected error on service module |
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12-14-2023, 11:08 PM | #759 | |
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From Destin's video, comment from someone from NASA:
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12-15-2023, 08:20 AM | #760 | |
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So really what I was trying to say is that I get why the made the command module larger, but that doesn't explain why the service module couldn't have grown equally, particularly given there is no LEM and the rocket is more powerful than a Saturn V.
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12-15-2023, 11:33 AM | #761 | |||
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12-15-2023, 12:35 PM | #762 |
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Hyperloop: I've done some quick math, and I haven't done this in years so I could be wrong. Assuming something the size of a 737-700 cabin that weighs half as much as the empty plane, and with no losses to drag/friction/heat/etc, the object would need to be moving at a bit over 1000mph at standard temperature and pressure (sea level, 0°C) to convert enough dynamic pressure into downward static pressure to achieve lift.
Again, 0 factor of safety. 0 losses. 0 payload. Sea level pressure. The math gets way worse when you add reality into the process. PS, that's about Mach 1.3. Good luck with shockwaves. Edit, something seems fishy, I will look back into this tonight.
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12-15-2023, 03:27 PM | #763 |
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I have a minute to list assumptions:
Object is a cylinder 5m diameter 30m length 20,000kg mass G=10m/s^2 Atmosphere is assumed Earth at STP 273K Temperature 101kpa Pressure 1.2kg/m^3 air density 340m/s speed of sound Let's assume all moving air from the front of the object is redirected to a series of perpendicular holes along the bottom half of the object, increasing the static pressure against a near wall. We will ignore the classic form of Bernoulli's equations because that would just reduce the pressure around the outside of the object and be counterproductive. Probably not the easiest way to do it, but welcome to my head. Total pressure of the inlet (TPI) is equal to total pressure of the perpendicular outlet (TPO). Losses and compressible flow properties are ignored. Atmospheric pressure is also ignored in this configuration. TPI = TPO 1.2*(v^2)/2 + 0 = 0 + 20,000*10/(5*30) v = 47m/s which is ~ 100mph I was indeed off by a 10 factor somewhere. However, that's 100mph against a sealed wall, with no airflow going out. The second a crack forms is a different regime with different assumptions. I'll be back...
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12-15-2023, 08:06 PM | #764 | |
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12-15-2023, 08:30 PM | #765 | |
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Meanwhile, there a few different projects using vacuum tubes. The RAND article says achieving 0.5 bar with air pumps would not be a challenge. The loading doc could extend out like airplanes do and create an air tight junction to board. How much PSI is needed for lift, and how much is available using a turbine at say 1000 mph. The theoretical limit proposed by RAND and others is multiples of Mach speeds. Maybe Spuds will figure this out, but lots of money is pouring into these projects worldwide, so I don’t think we can dismiss the idea of a low pressure tube concept so frivolously. Knowing China, the will likely do it first. BTW, there are tunnels under oceans. Subways and underground tunnels do far better than massive structures swaying above ground. There is little mass and a lot of structural support with few things to toss about. Unless it is directly on a fault line that shears, it should be fine. Underground tunnels would be much better than above ground for simplicity, safety, permitting, and so on. https://innovationorigins.com/en/hyp...-in-operation/ https://www.scmp.com/news/china/scie...land-transport
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12-15-2023, 09:02 PM | #766 | |
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12-15-2023, 09:28 PM | #767 |
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Where would one dispose of the tailings from a 5meter x 1000kilometer hole in the ground?
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12-16-2023, 02:39 AM | #768 | |
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I feel like I am the only one here that has actually seen this document. Seems like the critics have only watched interviews and read news headlines and not this document below because all I have heard is the most exaggerated or basic explanations for this concept (a la ThunderF00t et al). Yes, he is not the origin of this idea like the critics like to remind everyone, but this document seems specific enough, even though it is simple enough, that it seems like a creation from him and his team. I mean, I read the RAND document, which is also sighted in the document below, and this setup seems very much like a Tesla product with induction motors, batteries, solar, etc. https://www.tesla.com/sites/default/...loop-alpha.pdf
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12-16-2023, 04:17 AM | #769 | |
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5 meter hole is pi x 2.5^2 x 1000 x 1000 = roughly 20 million cubic meters. Sounds like a lot until you realize that it is equivalent to 0.02 cubic kilometers, which is a square 0.27 km x 0.27 km x 0.27 km, or it is equivalent to 5 trillion US gallons, and then for reference, Lake Tahoe has an average of 35 trillion gallons in it, so you could build seven tunnels and dump it all in Lake Tahoe, and from the perspective of looking down on the whole country, you might not notice a dot went from blue to brown.
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12-16-2023, 12:31 PM | #770 |
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Yeah, Virgin Hyperloops is just streaming along, eh?
Honestly, I've given it no more than 15 minutes of consideration to decide it is a stupid idea that is going nowhere. Others have invested years and 100s of millions of dollars to get us where? I'm open to being surprised but so far I will stand by my for-free initial assessment. It is a dumb idea that won't work. |
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