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  1. Frank

    Any creative smart suggestions ?

    Your post reminded me of that tragedy and I thought it was important to mention, especially on an open forum. How would you avoid heating above the auto-ignition point? I'm thinking maybe not a blowtorch? I've been wondering how to do this safely for a while.
  2. Frank

    Any creative smart suggestions ?

    Full of water would be best - no fumes. A kid died using a plasma torch on a recycled empty drum despite it being rinsed out.
  3. Frank

    Rainwater collection

    Musk wants to use his boring company TBM for sewers. Maybe rainwater/storm sewers could also work? Might be a way to retrofit where no separate storm sewers exist.
  4. Maybe look for visual programming for python? Seems there are a bunch of options there.
  5. OK. Not sure exactly what the node is representing - a group of files that were pre-selected (or chosen) by hand? So it would create a sort of meta-hierachy or graph for the filesystem?
  6. Looks like you already found it, so is this promotion?
  7. Frank

    Giant solar collectors in space?

    One problem with hydrogen is it is cheaper to strip carbon from methane than to do water electrolysis! Not a problem (for profits) until there is a carbon tax. I just read that a nuclear plant in California isn't renewing their license, not because there is a push against nuclear there, but because they can't make money. Renewables are cheaper and there is a dip in demand between 9 and 5 which is bad for base-load power. They could produce hydrogen in the lull, but I guess it's not profitable either, or maybe within the lifetime of the plant, renewables will start producing the hydrogen more cheaply - who knows.
  8. Frank

    Giant solar collectors in space?

    Built in a mining pit, collects water too. Not for deserts I guess. Solar power tower - Wikipedia:
  9. Frank

    Giant solar collectors in space?

    Sandstorms damage panels, no water to clean the panels, not close to where people live, generally. Seems like these problems can be overcome, but the $ is probably not there (yet).
  10. Frank

    Giant solar collectors in space?

    One artificial moonlit test city, maybe - it's not a great idea. Solar panels in deserts can power the world. Some projects already exist.
  11. Frank

    Giant solar collectors in space?

    This might interest you: China May Soon Have a Second (Artificial) Moon: Downside: even from LEO, reflection is about 30 km wide (IIRC) because of Etendue - Wikipedia: which means to get 1:1 sunlight, the mirror would need to match that size! Also, rain and clouds means no light. There are also ideas about solar panels in space with energy beamed to earth using microwaves.
  12. Frank

    Rainwater collection

    So "pumped"? Good point but a bit pedantic.
  13. Frank

    Rainwater collection

    Fine if it rains. Need to keep the sides of the reservoir above sea waves, like by flotation. I was told Australian pools by the ocean sometimes get sharks in them. "Because in Australia, sometimes you have to pick a shark out of a pool" So the sides might need to be high enough to keep out marine life. For the ocean rise part, it seems unlikely the mass of antarctic glaciers plus volume expansion caused by temperature increase would equal what is siphoned off and never returned to the ocean (somehow). That would be a lot of very large reservoirs.
  14. Frank

    Quick Electric Machines

    Since planetary gears are used in turboprop engines and/or turbofan engines, I think yes. Also, I've noticed a sort of upper limit to existing permanent magnet motors of ~400 Hz or so, is there an induction resonance or high power electronic switching limit, or in other words, what limits the top frequency of electric motors?
  15. Frank

    Am I in the right place...???

    Yeah, very close, maybe suggest a "painting" or "wet paint" filter to highlight subtle colour differences, might help to turn on the flashlight too.