Flying cars and such were the dream of the future when the power usage of the average American was skyrocketing. Futurist figured it wouldn't be long before everyone was burning through jet fuel like it's going out of style just to pick up groceries.
It turns out there the trend wouldn't last forever and that runaway consumption was going to kill us all.
The future of transportation is efficiency. Flying will always be less efficient than going by ground.
>>7817784 Well then what other principle would it work on? If it relied on EM then the ground would have to carry a net charge for the device to work If you wanted to use some form of air pocket like a hovercraft you would need massive motors and liquid fuel, hardly a hover board if you ask me, not to mention that without the multiple contact points of a traditional skateboard It would have no stability
>>7817741 >>7817751 >>7817760 >>7817807 You lot are a bunch of narrow minded virgins, all that is preventing a real hoverboard of similar size is our current battery energy density. A guy did fly on a drone that was no more than 3x as big as Marty's hoverboard and the flight lasted 1 minute. Once this reaches 10 minutes people will probably start selling them. Honestly the military could have done it already with mini-turbojets, probably have in Area-51, but unlike the pleb market who is happy to spend $5,000 in jet fuel whizzing around for 10 minutes the military needs something long lasting in the field. The closest thing they ever declassified was the Williams X-jet so that shows they were working in that direction for years. And then of course there was Lexus' effort, If you really hate reaction thrusters then maglev tech is the closest you are ever going to get. It did manage to work in an extremely similar way to the one in the movie which had zero physics behind it which is quite commendable.
/sci/ has an awful engineering ethos, you think every new problem requires totally new physics, if you had any real skill you would be able to work with what you already have.
>>7817921 >all that is preventing a real hoverboard of similar size is our current battery energy density
Anon about that... We've pretty much reached the maximum of what's achievable. We can maybe bargain on like 10-20% in the future but that's the outlook on it. That's why new phones always get bigger and then advertise with longer battery life. It's not really that the batteries changed they just made them bigger. Actually that was the main reason behind the invention of tablets. I remember when everyone thought Tablets were stupid, but now everyone uses them simply because phones need to be charged all the time
>>7817950 That's not true, tablets came in because people wanted a bigger screen, same reason why phones are getting larger. Nobody gives a shit about battery life anymore, if they did they would keep using a 2005 Nokia because that will last a week on one charge. Plebs today will accept shit battery life for whatever bells and whistles they throw in phones today. Also >We've pretty much reached the maximum of what's achievable. This is another common belief all over /sci/ that I cannot stand. Like honestly why the fuck do any of you go into STEM if you all believe it's already cut and dried?
Guys, I figured it out! I present: the hoverboard! It uses maglev technology. The board on top (hereafter referred to as a "hoverboard") is magnetized, while a second board, on wheels (hereafter referred to as a "rollboard"), carries the opposite polarity. The two boards are joined by non-rigid but taut connectors, and the hoverboard constantly hovers above while the rollboard rolls along the ground.
>>7817950 >we've pretty much reached the limit with chemical based voltage sources
Ftfy While you're right that "batteries" as we know them are about at their limit There are other methods of energy storage which could be explored and MIGHT be able to surpass batteries in the long run.
I actually have an idea for a crystal based system >Inb4 crystals lol Let me explain. From the study of optics we know that crystals refract light at a unique angle based on the elemental structure and geometry of the molecules Based on this it has been known for centuries that, in theory, a crystalline structure can exist such that light entering it will become basically trapped if the angle is correct. Now we also have lasers which are just light that has been polarized to have uniform directionality Also there is no theoretical limit to the amount energy that can be carried by a laser So my idea is that if you had perfectly uniform crystal and you focused a laser beam on it at the right angle you could effectively trap that laser beam in the crystal for use at a later time >but anon crystals in the real world aren't perfectly uniform True, but with modern nanofacturing technology we could get pretty close Of course there would still be some imperfections which lead to "leaking", but modern batteries have the same problem >ok cool you got the laser in there now what? Not sure about this one yet, obviously still a problem, Maybe a controlled method of disrupting the structure to allow light to leak out in a controlled way? >even if you could get the laser back out how are you going to do anything useful with it? This is the easy part, PV cells work literally by converting light into electricity
Also I've heard that one of the most efficient known methods of storing energy is in the magnetic fields of capacitors, but for this to be practical we need room temperature superconductors Otherwise the line losses in the capacitor winding would make it far too inneficient
>>7818063 >Based on this it has been known for centuries that, in theory, a crystalline structure can exist such that light entering it will become basically trapped if the angle is correct. How would that work? I'm having trouble picturing it geometrically.
>>7818101 I read in a book about renewables not to long ago that a collapsing magnetic field in a capacitor has an almost 100% conversion rate from stored energy to electrical energy. Basically the idea the book put forth was that every population center could have a facility that was in essence just a gigantic capacitor. The device would store energy from solar/wind/thermal etc plants during peak generating times, and then release it during peak use times
Because that is actually the biggest problem with renewable energy, it isn't generation, it's the fact that our power grid was designed for immediate use and often times when renewables are the most effective at generating is when that energy is least needed
For example the reason wind turbines suck so hard is that they have to have throttling mechanisms so that they don't generate TOO MUCH energy and blow themselves up However if we had an efficient method of storing their their high burst output... Well that would change things considerably
>>7818163 I'd draw a picture if I could, Basically all matter has what is known as a reflection, and refraction index Reflection is pretty obvious, it is the light that bounces off of a material However not all light is reflected away, some light penetrates the material This light is also deflected by a certain angle This is known as refraction This process of reflection and refraction happens at boundaries between dissimilar materials (surfaces, or like in a mirror the boundary between the glass and the metal coating) So basically the light gets reflected and refracted twice, once when entering and once when leaving. The specific levels of reflection and refraction depend on what the material is made out of, and the geometry of the molecular structure This is why some stuff you can see through and some stuff you can't It is also why when looking through something that is clear the image appears distorted It is also how glasses work Now in theory crystal structures can exist such that a photon of light will be refracted at such an angle that when it is about to leave the matrial it is reflected back into the material also at such an angle that it will be reflected again when it tries to leave again on to infinity. The "leaking" occurs when the the light goes to leave through a part of the crystal that has an imperfection If it isn't reflected at the right angle the light will scatter and leave the crystal This process is also dependent on the wavelength of the light This is why prisms work
>>7818238 That I'm not sure about, I havnt studied QM yet in any detail, As far as I can figure though it seems as if the light is never actually "absorbed" into the structure itself As in the light is simply deflected by the electric fields of electrons, as opposed to being absorbed and increasing their energy states I could be wrong though and even if I'm right there would likely still be some level of absorption This might put a cap on the actual amount of energy which could be stored Exactly what that cap would be I don't know, again I don't know enough yet about the math involved to calculate it. I also know that the wavelength of the light is an important factor, and I know that wavelengths add through superposition. This is why laser beams can theoretically carry infinite energy. And again I don't know the numbers to predict how this would affect things It's possible that it would limited to carrying a very specific energy level, In which case exceeding or going below that level might actually result in a massive explosion as all of the stored energy is released instantaneously due to wavelength decay Still it would be a cool new form of explosive if that is the case
I just don't have the necessary math skill yet to find out the answers
I once had an idea for a society whose primary form of energy storage was compressed springs. You'd have impossibly powerful stationary machines that compressed impossibly strong metal springs into tiny containers. All portable machines would be designed to slowly release the spring force inside the container to power themselves, like a pneumatic system running off of compressed air. Actually, it's a pretty fun physics problem to figure out how an extremely large force acting on a tiny mass over a tiny distance could be used to power various mechanisms.
>>7818265 >As far as I can figure though it seems as if the light is never actually "absorbed" into the structure itself nah that's not true.
I'm not an expert myself but I had QM and condensed matter physics and I don't think it would work in any way you described it. you can maybe go around it by implementing some synthetic shit but that would be more work than just using algae (or bacteria) for batteries
>>7817738 Ok. So this confirms my theory that there exists a population of people here that would rather complain about the state of a world they know nothing about than actually explore it like scientists.
Hendo uses modified arxpax hover engines to make hoverbaords. Right now they work by generating eddy currents in a metalic surface below. The resulting magnetic field is what keeps the thing hovering.
>>7819067 Hyees, I see where you're going with this. Perhaps I we could apply the knowledge from Quantum healing, we could make quantum entangled chakras between the road chakras and hoverboard chakras. We could tweak them by making one repell the other, yet kindly and not harshly, so they don't blow each other away.
>>7818265 So if light is deflected by the electric fields of electrons, because of conservation of momentum the electron must be deflected too, so with enough light the electron gets delfected enough to fly off the atom. At the macroscale this translates to the system going BOOM!
>>7818166 >> a collapsing magnetic field in a capacitor What are you smoking?
You are probably referring to superconducting magnetic energy storage. Where energy is stored in a superconducting coil. You just set up a current in it, and it doesn't decay because it's a superconductor.
Energy density is really low, but it can respond very fast
>>7818268 Except that metal yields under large stresses
Now if you really want crazy energy storage you get some neutronium make it into a disk and spin it really really fast. Because neutronium is held together by strong nuclear force, and the energy stored in a flywheel is proportional to how strong something is, the energy density is really fucking high. like nuclear reactions high. Like a tiny disk could power a car for 100 years high.
Of course bulk matter held together by strong nuclear force does not exist so it's worthless
>>7817921 Except that's not a hoverboard anon. A hoverboard floats silently above the ground. Presumably it exerts some repulsive force against a volume of matter below it, which is necessary to explain why it does not work on water.
IE board repels a column of dirt below it, dirt repels back, hoverboard floats. Board repels column of water, column of water moves, force experienced by board is now proportional to the rate of change of the water's momentum
I remember coming across a paper on how EM fields could generate artificial gravity (theoretically enough to support hovercrafts). The very very basic idea is that if you put enough energy into a field you're gonna warp space-time. The problem is creating a technology that is capable of generating a safe and localized gigantic-ass-motherfucking EM field underneath a vehicle. Other than that I didn't really read into the specifics cuz I don't really care, it's not gonna happen anytime soon.
>>7819096 >So if light is deflected by the electric fields of electrons, because of conservation of momentum the electron must be deflected too, so with enough light the electron gets delfected enough to fly off the atom. At the macroscale this translates to the system going BOOM!
all of the literarue i have read suggests photons have such insignificant mass compared to molecular structures that the desplacement would be infinitessmal
>>> a collapsing magnetic field in a capacitor >What are you smoking? >You are probably referring to superconducting magnetic energy storage. Where energy is stored in a superconducting coil. You just set up a current in it, and it doesn't decay because it's a superconductor. >Energy density is really low, but it can respond very fast
ya my bad, meant to write inducer, i was thinking about it during class today and realized i got those 2 confused
>>7820456 >>all of the literarue i have read suggests photons have such insignificant mass compared to molecular structures that the desplacement would be infinitessmal What I have described is called radiation pressure: https://en.wikipedia.org/wiki/Radiation_pressure
>>7820465 well it's really more due to the magnetic field strength than electron density: https://en.wikipedia.org/wiki/Critical_field The energy density is also low due to the fact you need a large structure to prevent the structure from repelling itself apart
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