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Recent content by VEBill

  1. VEBill

    Using Ethernet hubs in an ATC system

    We've worked with very expensive famous brand Ethernet switches where the device management and settings were, by design, only available through an old fashioned serial port (only connected when setting up). Once such a switch is safely located in a secure room, the "exposed surface" gets very...
  2. VEBill

    Boeing 737 Max8 Aircraft Crashes and Investigations [Part 6]

    An inch in the UK over the years. 1895 - 25.399978 mm 1922 - 25.399956 mm 1932 - 25.399950 mm 1947 - 25.399931 mm 1959 - 25.4 mm exactly Ref. NIST The Gauge Block Handbook Link might be something like: https://www.nist.gov/document/mono180pdf Easier to google the title. Probably below the...
  3. VEBill

    Fuel centrifuge

    A lab centrifuge for separating fluids for testing in a lab? Look at the famous $1 Malaria Test. The centrifuge part is $0.20. https://news.stanford.edu/2017/01/10/whirligig-toy-bioengineers-develop-20-cent-hand-powered-blood-centrifuge/ More practically, try eBay.
  4. VEBill

    Will current feed back through ground on a marina circuit?

    The safety issue can be this (an example): A given boat has locally connected the Neutral and Ground (at their boat). One likely cause is their on-board inverter, where they switch off only the Hot when on Shore Power, leaving Neutral and Ground tied. This in itself perhaps doesn't cause any...
  5. VEBill

    Will current feed back through ground on a marina circuit?

    If the Neutral to Ground connection was only at the shore transformer (at the associated service panel), and if every boat maintained strict isolation of their Neutral (not tied to Ground at their boat), then that should eliminate AC ground return currents. Does that align with boat Shore Power...
  6. VEBill

    Will current feed back through ground on a marina circuit?

    Fresh or salt water? Which location? Local electrical Codes and practices vary. --- Related to boats sharing a common ground, consider also marine galvanic isolator devices.
  7. VEBill

    Blue Origin Lunar Lander technology

    "...and returning him safely to the Earth."
  8. VEBill

    Using Ethernet hubs in an ATC system

    I recommend remedial viewing of "hacker" presentations on these topics as found on, for example, the CCC.de conferences. One need only to watch a few of such ~40m presentations to begin to see the topic in an entirely different light. It's like having someone that denies the existence of...
  9. VEBill

    Pressure transmitter terminology

    When the spec sheet for an instrument states "0.025% span accuracy", they're obviously referring to the span of their instrument. (Obviously the instrument supplier wouldn't know anything about your intentions.) If this is written in some other context, such as a contract specification, then...
  10. VEBill

    Making Device Wireless

    How about using an IR LED to transmit the data? I assume you're only going a meter or several meters. The signal acquisition board would be redesigned to A/D, buffer the data, build packets, and intermittently IR blast them out once or twice using a suitable format (with some error correction)...
  11. VEBill

    The CIA 'owned' a Swiss company which was the world's largest supplier of encryption machines...

    Anyone using or paying for a VPN should think about this news item.
  12. VEBill

    Solar Panels on roof's do they actually bother checking before Installing?

    My house has about 24m2of glass facing essentially south (for passive solar gain), shaded by the roof overhang in summer (when the Sun is higher in the sky); so it comes with a roof that is naturally facing essentially south. The south facing roof has 24-inch deep parallel chord roof trusses...
  13. VEBill

    Leap technology combustor discussion

    There doesn't seem to be a lack of basic info all over the 'net concerning 'Twin Annular Premixing Swirler' technology (if that's what you're referring to). It's presumably patented, probably decades ago and likely expired by now. Obviously such patents are on-line, if you have time to find them.
  14. VEBill

    Low maintenance engine

    Coolant-free engines are common. Air cooled VW, small engines, etc. Using fuel to carry away heat might result in cooked fuel. Better to stick to air. Lubricant-free (sort of) engines are common in the form of two-strokes. If you can point to an air-cooled, two-stroke diesel engine, it might...
  15. VEBill

    Making Device Wireless

    It would be extremely challenging, but you've not provided enough information to be more specific than that. Presumably it's presently wired? How does the cable relate to the 4g weight? What distance to span? Does it need a power source (battery), or can RFID technology provide power? As a...
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