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  1. lucky555

    Alaska Airlines flight forced to make an emergency landing...

    Planes good to fly... what use is the NTSB investigation then?
  2. lucky555

    Tourist submersible visiting the Titanic is missing Part 2

    The recovered debris has been dissembled and cut, when you look closely. Bolts missing, frame pieces cut. Nothing is bent or mangled. No sign of any carbon fiber hull pieces. Missing is the titanium rear end bell and ring. I'm not sure how heavy that would be, but likely the ROV attaches lifting...
  3. lucky555

    Denny's Sign Failure

    Rain getting in between the plates and freezing, I have seen icejacking break bolts, it's somewhat common for streetlamps here and a ski tram pole fell over because of it. Now they use a set of extra nuts to give airspace between plates.
  4. lucky555

    Circuit/components to "help" battery through spikes in current draw

    I would do a bit more homework to see if something is making this worse than need be. Is the battery's BMS cutting out, i.e. seeing the overcurrent and disconnecting the pack causing the reboot glitch? What is the undervoltage lockout on the computer's power supply? It might be cutting out when...
  5. lucky555

    Canadian Iron Ring Ceremony Under Review

    I know the ring and ceremony as being from an era (1920's) where many people were falsely claiming to be engineers. So a lot of buildings and structures collapsing. The ring showed you are bonafide. When I graduated we were all really proud to get our iron rings. After 29 years, I can't say I...
  6. lucky555

    Miami Beach, Champlain Towers South apartment building collapse, Part 09

    How is concrete infinitely repairable? Multiple repairs were hammering out spalled concrete, sandblasting rebar and then fill with concrete and oh look at the lovely cold joint. I can't see the strength in "repaired" columns. Original construction contractor Edward L. Nezelek Inc. sure has a...
  7. lucky555

    Miami Beach, Champlain Towers South apartment building collapse, Part 09

    Partial roof area #1 15,496 and #2 1,711 sq.ft = 17,207 sq. ft. for the gray areas. (from preliminary-review-plans-for-40-year-re-certification) called for CCW-500 hot-applied liquid waterproofing membrane. Two layers, I estimate 15,275lbs for 125-mil coating, plus 10,992lbs for 90-mil, plus...
  8. lucky555

    Miami Beach, Champlain Towers South apartment building collapse, Part 08

    There's some expectation a PE is going to hawkeye every step of construction. It's not practical from cost/efficiency to stand around all day on site and is a myth that needs to be dispelled. "...five engineering experts consulted by The Miami Herald said that as the inspecting engineer on the...
  9. lucky555

    Miami Beach, Champlain Towers South apartment building collapse, Part 08

    Structural engineer Sergio Breiterman... seems to have had an aura of um insufficient reinforcement and failed design for waterproofing. Coral Gables 1975 (later housed police and fire dept.) cracks discovered months after completion, missing rebar (half of what the design called for, in areas)...
  10. lucky555

    Crane Collapse in Kelowna, BC, Canada

    On a crane with no hardhat, no steel-toed boots, no fall restraints - and you're worried about a Youtube channel where the guy calls this out, with coarse language? F-bombs are totally appropriate. Engineers who sit at their desk all day will never understand this. When I'm on site and they...
  11. lucky555

    Miami Beach, Champlain Towers South apartment building collapse, Part 06

    I stumbled onto this tour of the Champlain NORTH building's parkade, might be worth a look. Innermost and a few other columns look bigger and the ramp area does have a strange raised slab for the generator room. https://youtu.be/QbjRUvCGRXc?t=574
  12. lucky555

    Miami Beach, Champlain Towers South apartment building collapse, Part 05

    Where are the plumbing chases? I'm wondering if they were a failure node. Fire water supply piping should exit out of the generator room and do a vertical run. The dryer vents, not sure what path they take, where they are. I just wonder if that's a roof-basement weakness or path. Some...
  13. lucky555

    Miami Beach, Champlain Towers South apartment building collapse, Part 03

    The middle part of the building's history is not considered. Major 2002-2003 work by A.T. Designs had a bunch of structural repairs, mostly balconies. Then again they were doing more repairs 2009. Column spall repair pg.172 chipping out concrete at columns was part of it and who knows if they...
  14. lucky555

    Miami Beach, Champlain Towers South apartment building collapse, Part 03

    Engineering as a profession has to stop blaming itself. It started with the Iron Ring to keep us humble but that is being used against us now. We are surrounded by corruption and ineptitude all the while trying to build something safe. We are given all the responsibility and yet have none of...
  15. lucky555

    Miami Beach, Champlain Towers South apartment building collapse, Part 03

    Alright, which one of you guys did it: source "Crestview Towers’ condominium association in North Miami Beach has a report from an engineer saying the building is safe for occupancy and it will be submitted to North Miami Beach officials by Noon on Tuesday according to Mariel Tollinchi, the...
  16. lucky555

    Miami Beach, Champlain Towers South apartment building collapse, Part 03

    For the roof loads, I estimate qty. 150 of 3-ton A/C units (in groups of a dozen) plus a couple cell repeaters and electrical panels. That looks like 33,000lbs of add-ons distributed across the roof. Then there's the penthouse. I did not look at the main rooftop unit weight for cooling the...
  17. lucky555

    Miami Beach, Champlain Towers South apartment building collapse, Part 03

    250kW diesel generator estimate 6,000-7,000lbs plus fuel tank size. A heavy load and I see the slab and columns are ordinary. The collapsed beam looked under that room. I wonder if the diesel was the stubborn fire. Generator uses about 64 gal/hr. and not sure of spec on how long they need to run.
  18. lucky555

    Miami Beach, Champlain Towers South apartment building collapse, Part 03

    Isn't the Generator Room above the garage entrance, it was going to be replaced and the slab reinforced. Over the collapsed section in tiktok video? I wonder if the weight was accounted for in the original design. What's the weight of the new roofing materials? I see one pallet still there on...
  19. lucky555

    Miami Beach, Champlain Towers South apartment building collapse, Part 03

    October 2020 9-page Morabito report obtained by the Miami Herald, concrete testing “yielded some curious results”. But no mention of what it was or numbers etc. “exploratory demolition” in five locations. "Experts said they were struck by what wasn’t said." source: Miami Herald
  20. lucky555

    Miami Beach, Champlain Towers South apartment building collapse, Part 02

    "Looked at south/west planter with manager. Planter has structure crack and would need extensive repair manager wants to patch at this time". permit -02 pg36/178, 09-12-02 (from IEGeezer's links) This is during major repairs, no change to scope by the Board. Yup, engineers have none of the...

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