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About Externet

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  • Location
    Mideast U.S.
  • Interests
    Old Cadillacs, scuba electronics.
  • College Major/Degree
    Electronics engineer, audio recording engineer.
  • Favorite Area of Science
  • Biography
    Plain old fart tells it all.
  • Occupation
    Retired from electronics and shrimp farming.

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  1. Thanks for your response; appears to be clear and accurate enough. Is this an on-line tool that I can access ?
  2. Hi. Am not good enough and less when as blurry as this... Can someone translate the pharagraps following "14" ? Is that for a motor? 🤔 It is an image and do not know how to get a translation from images Thank you.
  3. Google did changes to the search process and capability a while ago and cannot access some foreign things now. Trying to locate a russian brand/factory of electric bicycles from several years ago, to find if they are still in business or production. From USA, cannot see internal russian sites any more ¿? That manufacturer had also a video of the bicycle; and a full site for the product. Can someone capable of doing such search inside Russia post a link where I could see maaaany results to choose the correct one ?
  4. Thanks ! OK, checking...; one of the 230V conductors in a plain wall outlet is neutral and does not come from a power pole transformer centre tap. The other is earth ground and comes from the utility company street pole. The last is 'live - hot - phase' from the utility company and does not come from a utility pole transformer 😕 and it is the only and single 'phase' electric conductor supplied to a household. And each country in the european community does it the way they want.
  5. Hi. Does wiring in concrete, block, stone walls runs mandatory inside metallic conduit?; with several insulated single conductors or multiple bundled conductors ? Is 'Romex type' multiple conductor wire used there ? Is the 230V two 'live' wires from a centre-tapped utility transformer or is one of the conductors neutral ? Are neutral and earth ground joined somewhere ?
  6. Thanks. 25 litres per minute is the atmospheric air pressure inlet before compression. Like at start of every cycle; 25 atmospheric litres are fed above the oil surface, then compressed and delivered trough a non-return valve and 25 more litres are admitted for the next (1 minute) cycle. 25 l/min is not the flow at 6000psi.
  7. Thank you. 25 litres/minute. Am very aware of dangers for gases under high pressure. Lubrication in an air high pressure piston compressor I had took a very special synthetic oil MIL6085A to avoid it from combusting as diesel fuel when exposed to high pressures and destroying the compressor; and wondered how worse would the similar risk of vegetable oils be.
  8. Thanks, gentlemen. Do you see a convenient way to compress air with no toxic contaminants as from synthetic/mineral oils ? The intention is to explore using a hydraulic pump to compress air above oil surface. Is there such contraption in the market ? Using water could corrode the pump.
  9. Hello. How to find at which pressure, which edible oils ignite/decompose ? Where to look for such data ? Say plain soybean oil; will it withstand being pumped/compressed at 6000 psi / 400 atm ? And other edible oils...
  10. Any reflecting or shading treatment should only be done at the exterior; before sunlight hits the windows glass. That produces a considerable cooling !
  11. Good day to all. If a catastrophic failure in the forum server damages the records of years of posts; is there a backup of all contents ? Is it possible to purchase DVDs with the SFN contents; since day one; or by years; or by subforum contents ? Or what is suggested to obtain/download the history of a subforum content -say Applied chemistry- to save in optical media in a readable format , like we access it normally any day ? What about copyrights, use restrictions, ownership ?
  12. From a years old thread, seems these Tuareg people know how to deal with it better than anyone... I still do not get how they do it. Body temperature is less than ambient Since milennia before hi-tech fabrics... And not always in white : -Images borrowed from the web- If against rules, please delete.
  13. If you call it "the chicken egg" because has a chicken in it; would be different than calling it "the chicken egg" because was laid by a chicken. Which correctly, would be a hen instead. 🤨
  14. Why "fully" hydraulic ? What fluid is in the combustion chambers; and what forces the diaphragms to compress upwards what enough; and what does "cooling" cools ? Reciprocal flow is passed to a full wave rectifier analogy of one -way valves to make it unidirectional.
  15. Is there any relation of this claimed Mpemba thermal behavior with efficiency of melting ice on a windshield preferred done with cold water than using warn water ?
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