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  1. zeusfaber

    MV Viking Sky: 2019 TLF and near-grounding.

    Norwegian Safety Investigation Authority report into this accident just published. "In the afternoon of 23 March 2019, the cruise vessel Viking Sky experienced a blackout, causing loss of propulsion and steering, in 24 m/s winds (BF9, strong gale force)31 with gusts to 29 m/s in the Hustadvika...
  2. zeusfaber

    It came from the bathroom

    ... a story even Ed Wood would once have dismissed as too improbable to make a film about. https://www.zdnet.com/home-and-office/smart-home/3-million-smart-toothbrushes-were-just-used-in-a-ddos-attack-really/
  3. zeusfaber

    Miami Pedestrian Bridge, Part XII

    A continuation of our discussion of this failure. Best to read the other threads first to avoid rehashing things already discussed. Part I thread815-436595: Miami Pedestrian Bridge, Part I Part II thread815-436699: Miami Pedestrian Bridge, Part II Part III thread815-436802: Miami Pedestrian...
  4. zeusfaber

    Passenger train run with open doors

    Fortunately, a dangerous occurrence rather than a disaster. RAIB Report 06/2019: Train travelling with doors open on the Jubilee line There's an unusually wide variety of causal and contributory factors in this one, to the extent that it would make a useful teaching example. A
  5. zeusfaber

    Merrily, Merrily, Merrily, Merrily...

    ...over the side we go. http://www.bbc.co.uk/news/av/world-europe-42681305/plane-skids-off-runway-at-trabzon-airport-in-turkey 168 on board and no injuries: Says something for the merits of strapping passengers into their seats (compare recent urban light/heavy rail accidents). I quite...
  6. zeusfaber

    Single phasing or overload?

    I'd be grateful for a quick second opinion (or two). Photos below from the terminal box of a 440 V, 60 Hz, 30 kW, 6 pole TEFC motor (S1 duty, Class F insulation). Apart from the two obviously cooked wires, the rest look and feel normal. It let some (a lot of) smoke out. The rotor turns...
  7. zeusfaber

    Multi speed induction motor

    Bit of a schoolboy question here - but one that's outside my normal territory. Somebody's asked me to look at a three-speed induction motor that's been sitting separately from its partner machine tool for long enough that the identity of the nine terminals on top of the machine has been lost...
  8. zeusfaber

    Manual crosspoint panel for discretes

    Long ago, I remember seeing a little square crosspoint panel in a catalogue - came with a set of diode pins you slid into the holes to patch discrete inputs on the rows to outputs on the columns. Never had any use for the things at the time and now I do, I can't find them. I'm obviously...
  9. zeusfaber

    Identifying stainless bolts

    Apologies if this is an obvious question - but it's an end of engineering I don't normally work in: Been landed with a piece of kit held together with a number of stainless bolts that are far too tatty to put it back together with (some would benefit from still having a head, for starters)...
  10. zeusfaber

    Removal torque

    I suspect too much torque has been used to assemble some pipe couplings. If you know how much torque was required to undo a threaded connection, is there a rule of thumb you can use to get some idea of how much torque was used to do it up in the first place? A.

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