Comments by "kazedcat" (@kazedcat) on "Scott Manley" channel.

  1.  @ThePrisoner881  The scary part is the tank that store all those salt water propellant. If something happens to you neutron absorbent lining. You have a spaceship size nuke.
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  2. @NaN Go unsubscribe we don't need you to spread your idiocy here. Have you seen "How not to land a rocket video"? Count how many failures Spacex have to deal before they have a successful landing. But now they have successfully landed 50 booster. Now how many rockets have you launch into orbit and then landed with out any failure? Spacex don't need to prove their method because they have already proven that their method work and it works while achieving large cost reduction. If you think they are doing it wrong then it is you who needs to prove how to do it right. Go build a rocket and show us your superior methodology. I will only accept that your method is superior if you are able to launch and land 50 rockets at lower cost. Prove to me that you are not just a keyboard monkey who has not built anything significant in your life. Where is your rocket company building rockets with your superior methods?
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  3. The satellite is put exactly in a phase so they line up. You can also put the satellite out off phase so they don't line up but that would be a pointless thing to do.
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  4. I was just hoping they could get aerospike airborne even if nothing pan out after that.
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  5. @NaN You need to show your company doing 50 landing at a cheaper price. Nasa burns money and can't even send their own astronaut to the space station. I am sure great people in Nasa did great things in the past given unlimited budget. But you on the other hand have neither unlimited budget nor a rocket company. You keep calling Falcon 9 and Dragon Capsule as snake oil when you have only farts and toxic gas coming from your mouth. You are wasting the oxygen you are breathing in your mouth spewing toxicity and negativity. Prove your words and steal Spacex business with your superior methods? But you can't you are just a keyboard monkey that will not do anything significant or noteworthy in your life.
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  6. This LEO constellation are required to completely disintegrate during deorbit. Being flimsy is a license requirement.
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  7. Pluto : You can have a curve 2d space. Just like the curve 3d space near massive object predicted by general relativity. Dimensionality does not determine curvature. Also the universe is flat but the earth is not.
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  8.  @nuclearmedicineman6270  You refuel with premium weapons grade propellant.
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  9. Adora Basil Winterpock Spacex is currently testing new modified versions of Starship every month. Stainless steel allows you to just weld your modification to the base structure.
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  10. Yeah the probe probably interfered with the magnetic field lines and produce a tiny sun spot that should have not existed without the probe.
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  11. Rocket motor for solid propellant rocket. Rocket engine for liquid propellant rocket.
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  12. Epoxy don't work on cryo temperature they used cryo rated binder.
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  13. PTNLemay you can fly a plane with solar power. I don't think power will be a problem. You just need the deltaV produce by the ion engine equal to the negative deltaV of drag.
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  14.  @Jona69  They already did that on parker solar probe. The shield was a sandwich of carbon carbon panels and in between is a carbon aerogel.
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  15. Urho Drinks Water space is distorted by presence of mass and energy. So it has wrinkles and it does not matter if it is 2d or 3d. Overall the universe is as flat as we can measure but around the sun and the earth space is not flat it is curve. Holographic principle does not matter because even in 3d the universe is flat but even if the universe is flat the earth and the space arround it is not flat.
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  16. ​ @Kremithefrog1  Testing is faster than calculating. Go try it calculate the dynamic force of a rocket exhaust and it's interaction with solid concrete. Even with a warehouse full of GPU to simulate the physics you will be going nowhere with it. Navier Stokes Equation is still an unsolved mathematical problem. If you have a solution there is a 1 million dollar prize for you.
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  17. If it was carbon fiber issue then they should have gone back to lithium aluminum structure like the falcon 9 instead of going for a much heavier steel structure. The only way it makes sense to use steel on a rocket is thermal issue.
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  18.  @Urgelt  There is zero evidence of carbon fiber structural issue. It is clearly evident that the choice of steel is a thermal protection issue. They have built carbon fiber structure and even conducted destructive testing of prototype structures. They only switch materials when they reach the stage of prototyping thermal protection system. Prior to that they are fully committed on carbon fiber and even bought a large scale mandrel for it. The switch happen when they are conducting development of TPS and the canceled falcon upper stage TPS test vehicle point to Spacex conducting preliminary TPS study that results to them switching on structural material.
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  19. Greg Ewing far away galaxy violates newtonian conservation of momentum. They accelerate away from us without need of a reaction mass.
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  20. So momentum is conserve except when it is not. Also Dark Energy violates conservation of energy and they also have this annoying property of having negative value.
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  21. A millimeter wave microwave and then turn the rocket tank into an antenna that directly dump the energy into the water inside. You can then use a phase array transmitter to beam microwave into the rocket using beamforming to reduce the losses as much as possible.
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  22. Not the same. Maximum aerodynamic pressure happens when the rocket have not expended most of it's fuel. The problem here is unbalance loading where the top tank is full and very heavy while the bottom tank is not pressurized enough to support the top tank. During reentry both tanks will be mostly empty so the tanks need only to support itself.
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  23. Guy Jones slowing down takes a lot of fuel which means you need an even larger rocket. By using the atmosphere to slow down you save a lot of fuel. Apollo is already a gigantic rocket so something bigger will be truly monstrous.
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  24. So Thunderbolt for 12hour period Tundra for 24hour period that means 48hour period is Tunduraga.
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  25. PTNLemay the energy needed is 1/2mv². The v is the deltaV you need to counter drag. Power is just energy/time. You don't need high power because drag is very low
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  26. When a photon is absorbed it stops existing. When a photon is re-emitted that is a new photon. But the atom that absorbers a photon changes it's energy state to a higher level and when it re-emits the photon it drops back to it's previous lower energy state.
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  27. Danilo Oliveira Let us consider a steady state operation. The mass flow rate at the nozzle exit should be equal to the mass flow in the nozzle intake. Because if not then either the mass inside the nozzle drops below critical or the mass inside is increasing causing it to explode. The mass going in is equal to the mass going out but the intake opening is smaller than the exit opening so in order to maintain the mass inside the nozzle either the intake flow velocity is faster or the intake flow is at higher pressure. The nuclear reaction is adding energy to the propellant inside the nozzle so the exit flow velocity should be faster than the intake flow velocity. That is also the main purpose of having nuclear reaction to accelerate the propellant in the nozzle. That means the intake flow velocity must be slower than the exit flow velocity so the only way that the mass inside the nozzle is maintain is to have higher pressure at the intake. Now the pressure at the nozzle exit is equal to engine thrust divided by the opening area. We know the engine have crazy high thrust so the pressure at the nozzle exit must also be crazy high this means the intake pressure must be even higher and the pump must be able to generate an even higher pressure.
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  28. cmilkau You are just saying technology will solve all their problem. We have abandon nuclearthermal because chemical rockets are much easier tech to solve. They have a much more difficult problem and what ever tech they needed to solve it will be much more difficult to develop. If they need nuclearthermal rockets to deliver GEO sats then they already are on a much more difficult tech path compared to us.
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  29. ​ @simonmultiverse6349 Kilometre, Centimetre, Millimetre, Micrometre, Nanometre.
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  30. No you want all the exhaust confine in a small area to maintain criticality and burn as much uranium as possible. Also aerospike engine actually lost it's efficiency advantage in the vacuum of space.
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  31. William Mitchem hydrogen is the best propellant because it has the atomic mass of 1. There is nothing better. For electric propulsion it migth be possible to use something better than xenon but that is only useful when you are already in orbit.
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  32.  @Baerchenization  Spacex won government contracts because they are the cheapest bidder. If you consider their bid overpriced what would you call the bid of the other contractors that is 5 to 10 times higher than Spacex bid.
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  33. I don't think you will see mach diamonds on clustered engine. I have never seen mach diamonds on falcon 9 launch.
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  34.  @rofflestomp684  Spy photos of the tooling use on previous CF tank prototype indicate some sort of pressurize bag system. Speculation on the process is that the tooling is wrap first with vacuum bag then that is wrap with pressurize bag. Then the tooling itself is heated with gas burner.
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  35. You would use more energy than you extract. If their explanation about pushing on the vacuum virtual particle is right then at some point the virtual particle would limit your speed. Vacuum would then give you a preferred frame of reference but isn't cosmic microwave background already giving you that you can measure your absolute velocity against CMB so we already have a preferred frame of reference.
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  36. They load warmer helium and let LOX to chill it in the tank. It is a much slower procedure but with warm helium there is no chance for your LOX to solidify. The problem was chilled helium expanding into the COPV will rob heat from the surrounding LOX causing solidification.
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  37. Highly unlikely the previous failure happens much slowly. Orders of magnitude slower. The latest failure all happen within 96 millisecond. In previous failure they have enough time so that acoustic triangulation is possible to pinpoint failure point.
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  38. Jett Quasar It is not similar. It's like describing firecracker exploding and soda can popping similar and wondering if soda can pops because there is a firecracker inside.
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  39. or they could be using aneutronic fusion like proton-boron reaction which produces a lot less neutron. And can be reduce a lot more if you are dumping your plasma at the back as propellant.
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  40. Your rocket engine will fire 10% longer and 10% harder. So if you work out the rocket equation even with the 10% more mass it is actually a net gain.
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  41. Spacex will probably switch to no liner carbon fiber tanks that they are developing for ITS.
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  42. How are you concerned about the photons when entire galaxies accelerate away from us without reaction mass. Dark energy violates conservation of momentum and conservation of energy without a problem the question now is it possible to convert microwave into dark energy and if not why not?
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  43. Probably microscopic scale. LOX is known to act like pressure sensitive high explosive when combined with organic material.
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  44. BenGman Millimeter wave radio. That is the frequency band use by event horizon telescope. This band is the latest in advance high resolution radio technology. But EHT is upgrading into sub millimeter band so we can assume military tech is already using sub millimeter SAR satellites.
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  45. L1 & L2 is unstable so satellite is put in an orbit that hangs around the L point. L4 & L5 is stable but it is not a point but a region of space that object naturally hangs around. This means that there are plenty of space to place satellites near L points. L1 and L2 needs station keeping to maintain precise orbit. L4 and L5 don't need it objects tend to stay on the region.
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  46. So the reason most nuclear power plant is not critical safe is because safe design is expensive?
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  47. The second stage cannot be fully tension because they need compression strength so that the engine can push the payload.
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  48. Its what RocketLab did use green monopropellant on their test launch of the electron rocket to test it.
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  49. The structural integrity field emitter is yet to be attach. Seriously the last stainless steel rocket don't have structural integrity. It's a balloon tank design and the propellant pressure is what stop it from collapsing on itself. This at the very least have structural integrity to stand on it's own unpressurized.
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  50. Why don't we have those advance techs. Galactic survey says we are one of the early civilization in the galaxy. We are the advance civilization rigth now.
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  51. hcI legeek if the orbit is high enough. The TESS satellite was put in a specific high orbit to take advantage of the moons gravity. Even with the high orbit it take weeks to have significant effects.
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  52. Jack Vernian you don't need the exhaust to be at orbital velocity because you are just topping off the lost deltaV.
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  53. They are using carbon fiber tanks. Scaling up production is not straight forward. Getting skilled employee just to layout the fibers will be hard. Then they need additional giant autoclave this alone is what force spacex to try their complicated fairing recovery. And then you factor in the number of reusability. Yes reusing twice may not be cheaper than doubling your factory but if you can reuse twice there is a possibility of reusing three times. And three times reuse will definitely be cheaper than tripling your factory.
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  54. Live The Future It happened because Spacex is big enough now to basically say we accept credits Nasa can pay us whenever it is convenient for NASA.
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  55. That only happens if the wormhole is twisted. If the shape of the wormhole is some sort of 5 dimensional version of a Klein bottle.
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  56. It is feasible. Elon says his 6.5 serious so he must have a written proposal about it. Maybe some spreadsheet calculation of it's feasibility.
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  57. von nobody no the problem is velocity you need twice the velocity to reach orbit which means you need four times the energy. What ever tricks you use will not get you out of needing that much energy. The best way is to get out of the atmosphere as fast as possible and then start accelerating immediately. Lingering in the atmosphere will just waste energy from drag and gravity loss that you should be using to increase velocity. Now if the atmosphere is 90% oxygen then there migth be a point in staying longer in the atmosphere to extract oxygen. But using it purely for lift is just wasting energy.
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  58. I don't know if they are using it but pulsar navigation has an accuracy of a couple kilometers.
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  59.  @MrTomyCJ  I am more worried on the neutron absorbent lining on the tanks. You need them to be strong enough to survive the intense vibrations. Also the pump needed to feed the reaction nozzle needs to produce higher pressures than nozzle pressure. High pressure also brings the salt water closer to criticality so there is a limit to the size of your pump.
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  60.  @danilooliveira6580  In order to create the fuel flow you need pressure gradient from the pump to the nozzle. The direction of the flow is from high (pump) to low (nozzle) pressure. The nozzle is going to be at very high pressure near the neck to generate the high exit velocity of the propellant. The pressure at the pump will be even higher than the pressure on the nozzle neck.
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  61. ​ @bjw0007 You are assuming homogeneous stress. In a non homogeneous stress there will be a torsional component.
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  62. ​ @lolilollolilol7773 Rockets require more longitudinal strength.
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  63. ​ @GOP_Fascism_vs_DNC_Hypocrisy carbon fiber is not a string it is very stiff more like a steel wire than a string.
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  64. There is a slider that restrict how wide the strings can open. The length of the unrestricted string will be the radius of the opening. Sliding the restriction down will lengthen the unrestricted string increasing the opening radius.
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  65. The same thing but bigger. The resolution is limited by aperture. Sar extend that limit so having bigger satellites with bigger aperture combine with sar gives higher resolution.
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  66. Mountains does not help you get to orbital velocity. What actually helps is use the planets rotation to add more velocity to your rockets that is why luanching near the equator is preferred.
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  67. Brane 2 First thing 5nm is not 5nm detail it is 20~30nm detail. Yes process node number is a marketing lie. Second multi patterning technique allows them to draw details smaller than the wavelength they are using. So starting with 140nm the resolution limit for that is half the wavelength or 70nm. Using double patterning allow them to draw lines at half of 70nm which is 35nm. Using quad patterning allow them to draw at a quarter of 70nm which is 17.5nm. There you go drawing features between 17.5nm~35nm using 140nm UV for "5nm" process node.
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  68. Brane 2 The difference is drawing vs. imaging. With drawing things you can draw guide lines and then erased them after. This is what multi patterning is drawing multiple guide lines then erasing the lines not needed. Imagine you have a marker that has 10mm tip but you want to draw a 5mm line. So you use two markers one yellow and the other cyan. First you draw a 10mm yellow line with the yellow marker then you draw a 10mm cyan line with cyan marker but it is shifted 5mm to the side. What you get is a 15mm multi colored line which is 5mm yellow, 5mm green from overlapping yellow and cyan, then 5mm cyan. You then erased the cyan and yellow leaving a 5mm green line done using markers with 10mm wide tip. Now I challenge you to adopt that technique when taking a picture.
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  69.  @brane2379 You are asking for someone to explain things for you. Now you are angry because someone did the explanation on how microchip fabrication works. I follow this industry closely so I know exactly the technology being implemented as the industry drives to build smaller and smaller transistor. You can call bullshit and stay ignorant or you can do research on this topic. There is a wikipedia article on multi patterning lithography. Learn or stay dumb I don't really care your opinion is irrelevant.
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  70. Upgraded wind turbine should be ducted counter rotating many bladed fans
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  71. Wings are stupid but dragon wings are awesome. Elon is just obeying the rule of cool.
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  72. thetafarmer You can but it will take a lot of effort because this satellites will be broadcasting radio wave at a very low power level.
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  73. Rockets are usually built to material limits. Any other way will be inefficient. If you shrink rockets down to the diameter of a soda can. Then the tank walls are thinner than that of the soda can.
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  74. No Dark Energy produce negative pressure. Normal energy including gravitational waves produce positive pressure.
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  75. It is fully 3d printed. It is pressure fed so it is actually possible to 3d print everything.
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  76. If it is possible to update oneweb's satellite firmware so that they are compatible to starlink's system then they might buy them out to get starlink into service faster. I doubt that will be possible and the window where the extra satellite will help accelerate starlink into service is fast going out with the rate spacex is launching starlink satellite. It would be cheaper for spacex to put their own satellite into orbit compared to buying oneweb's satellite.
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  77. otto von ottsville You collect them on Jupiter's magnetic fields.
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  78. It make sense if you think about how expansion ratio have direct effect on the ISP. ISP is the particle velocity of your exhaust. Bigger expansion results into higher velocity.
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  79. @NaN No radiation fallout means not a nuke. But how did nuke becomes part of the discussion in rocket construction methodology. And you said you are going to unsubscribe yet you are still here talking gibberish and random things just to be able to keep talking. That is the exact opposite of going away. You can't even bring coherent argument go unsubscribe already. The value of your comments is negative anyway. Getting rid of you will only improve the comment section. So go away already.
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  80. @NaN Go away you can't even distinguish which are you arguing with what. My last comment is about you bringing nuke in a rocket construction discussion now you are talking about energy density which has nothing to do with construction method And lastly you are still here clinging in the comment section when you said you are going to unsubscribe. So I will repeat myself go away already.
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  81. William Mitchem Any unkown compound will have molecular mass >1 which means it is automatically worst than hydrogen. Rockets effeciency ISP is affected by the propellants molecular mass. Earth is lucky we can use propellant other than hydrogen. Superearth will have more limited choice of propellant.
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  82.  @Patchuchan  That is why you pre deliver a solid tungsten telephone pole into orbit with deorbiting system so that you can drop a "rod from god" anytime anywhere.
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  83.  @AIM54A  Nope in the future planet as a category will be deprecated. There will be a new term for a circumstellar spheriod object that will include objects now classified as planets. Since majority of the data for classification will be from exoplanets and exomoons. There will be no point for a separate classification for circumsolar objects because extra solar object will offer rigorous statistical classification.
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  84.  @khj5582  2 billion is what they need for paper work and 0.9 is what they really needed to build the hardware.
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