Brazillian businessman built a giant perpetual engine
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However, if you can generate free energy then you are like a god. You can use chains of even the most crappy perpetual motion machine to generate infinite energy and construct the most fantastical machines, who cares how much energy they consume! You could conquer planets and command your own vast galactic empire. You are only limited by your imagination since infinite energy is available to do whatever you desire.
Peak HN.
I can create a device, which will harvest 1W of power from starlight infinitely. Good luck with your ambitions.
I connect many of these together and eventually I have 1.1 W from my 1 W input. I can keep going in this manner, at some expense sure, but now I’m producing 2 W per 1 W input. The effect must be cumulative if the device is truly a perpetual motion machine.
It will cost me less to mine resources giving me economic advantage. Eventually as I build more energy production capacity it will cost me nothing. I can harvest as much raw material as I need and fabricate whatever machines I want at zero cost. Currently this only limited by wealth but in my free energy utopia I’m unconstrained except by availability of material resources, I have infinite energy.
So I build a lumbering ship unconstrained by the limitations of mere rockets and mine the planets. I can build a planetary civilisation from this. I have enough energy, mechanical and computational power to do this easily. I now need to devise a means to achieve interstellar travel. But I have infinite energy, therefore infinite compute and near limitless material resources across the solar system.
Because of the promise of perpetual motion and free energy the effect snowballs at every step.
Reductio ad absurdum
Gravity can generate motion and one can extract energy from it. But in general some effort is required prior (like sun energy that fills up dams which later use gravity to generate hydroelectricity.
Gravitational motion is not perpetual, either. Water flows towards the center of the massive object curving space-time and that's it. It won't flow in a cycle. Unless some other factor spends energy making it flow, i.e. the Sun.
So a stationary generator that has no external energy input to keep motion flowing connected to gravity cannot generate energy.
I was invited in 2006/7 to a discussion of the company's technology hosted by the CEO. I was there with a small group of journalists and potential investors. I was there because a publisher I was involved with was contemplating a book about them.
What amazed me was how low the bar is for people to discuss something seriously. There were glaring inconsistencies in their presentation and in the associated materials. The back story they told was completely different to the story which the author of the book had outlined to us.
Even quite basic questions were deflected in the most obvious way.
I am absolutely not a scientist but there were very simple and obvious gaps in what they described.
Nevertheless people's politeness and/or credulity prevented any serious discussion taking place.
So you just quietly sit through their presentation, poke a couple holes that the audience already knows exist, and watch them fail to answer it. Done.
There’s an article on Hackaday about this beast of a machine [1]. A comment there got me wondering if you could build an art piece that breaks gravitational symmetry with the moon. A metric ton on earth would experience ~.03mN (~1 sugar cube) of force towards the moon. In the extreme if you floated a one ton granite sphere in liquid mercury, you would likely see some displacement (edit: actually no b/c plane of mercury would be normal to net gravity vector). Building something even remotely acceptable to demonstrate the concept would be tricky. My aforementioned Steorn interest taught me that ferrofluid can make an extremely low stiction bearing. You could potentially ’float’ a mass on a ferrofluid film and let the moon drag it over an exquisitely flat and leveled (1ppm) surface. You’d need to maintain the oil film but it should otherwise just ’work’.
1 - https://hackaday.com/2013/11/30/gravity-powered-generator-re...
Would be nice to see more of these physically feasible, but futile, mechanisms to extract energy. Just recently came to know about Atmos'clocks, for instance, and wondered if you could use something similar to power one light of your house or w/e.
Betavoltaics are another cool one. You wrap a beta emitter (like tritium) with a solid state 'betavoltaic' that works like a photovoltaic but for beta particles. These are commercially available and will provide microwatts of power at 1-2v for for 30+ years. (With the downside of a bunch of possible health/waste/regulatory implications)
https://en.wikipedia.org/wiki/Betavoltaic_device
https://citylabs.net/products/
RTGs are their bigger/badder cousins, used for space probes and super-remote monitoring/military applications - https://en.wikipedia.org/wiki/Radioisotope_thermoelectric_ge...
Even if it does not violate any of the three guidelines of thermodynamics I think it might be quite pretty to watch, much like a kinetic sculpture.
Perhaps connect it to some solar panels so it starts undulating on sunny days.
So any device that at some point reaches it's starting configuration cannot work because the potential energy is the same. If you put ball on flat plane it will not move sideways because potential energy is the same there.
Before this bloke spent his money building this thing, he should have called them up and asked them a few questions.
It was dismissed on the grounds of the sun being "eternal" and gravity being an energy that can be "harvested" in the same way solar energy can.
There’s also kinetic energy. The Earth rotates, and we have the Moon. It’s theoretically possible to build a machine which harvests energy from that rotation. Tides are powered by that energy, it’s obvious one could build a machine to extract energy from tidal waves in the ocean. It should be possible to build a machine which extracts that energy directly, without the water.
Probably not practical because the energy density is too low, and the machine needs to be prohibitively massive.
Wikipedia entry: https://tr-m-wikipedia-org.translate.goog/wiki/Erke_D%C3%B6n...
Company website and their list of patents: http://www.erketurk.com/faaliyetlerimiz-en.asp
I found some surprisingly open-minded English-language coverage, also from 2013:
https://e-catworld.com/2013/09/28/brazilian-company-building...
https://will.illinois.edu/news/story/new-gravity-driven-gene...
> One blogger with a Brazilian radio station dismisses the project as an impossible perpetual motion machine. Even if it’s not quite that, University of Illinois Electrical Engineering Professor Peter Sauer said he’s never seen a gravity-driven device work without some additional energy input.
Didn't see any coverage after 2013. I wonder what the idea was. You can't announce a perpetual motion machine without being aware that there's no such thing.
General relativity does not preserve energy!