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Metric tons, so about 110% of the weight
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Mar 26, 2024 22:50
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mobby_6kl posted:Jeez do people really report every post they don't like You'd be surprised (or not!)
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Mar 26, 2024 23:03
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Idle speculation: A maintenance regime that you can charitably call "neglectful", leaving out the "criminal" only because of a technicality of jurisdiciton. Engine failure at an inopportune time leading to loss of rudder control, and away it went. That's how they keep destroying the locks of the canal I live at, I assume it's universal…
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Mar 26, 2024 23:06
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They did a terror on it
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Mar 26, 2024 23:07
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Crazypoops posted:I'm dying of curiosity to find out what happened on the ship legion of incompetent fishmen sabotaged the wrong boat, invasion postponed.
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Mar 26, 2024 23:14
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The ship did an automatic update and a vestigial stuxnet infection crashed, killing the power infrastructure
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Mar 26, 2024 23:17
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Can't be something simple, they clearly tried turning it off and on again.
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Mar 26, 2024 23:19
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Sentient Data posted:The ship did an automatic update and a vestigial stuxnet infection crashed, killing the power infrastructure That's silly, Windows XP isn't receiving updates anymore.
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Mar 26, 2024 23:29
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Lmao
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Mar 26, 2024 23:34
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Why don't they just raise the bridge?
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Mar 26, 2024 23:39
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Humbug Scoolbus posted:. which is why the ship when it lost power and steerage looked like it was aiming to ground itself by heading outside the dredged center channel. (It's about 20' deep in the shallows). I've cooled on this theory a little bit. The person who runs the Casual Navigation YouTube channel pointed out that Dali turned to starboard around the time it was passing the entrance to the Curtis Bay channel, and the initial turn to starboard might have been bank effect. Once they regained power, I imagine the thick black smoke was the engines going crash astern. We'll know more once the NTSB finishes up with the VDR. One of the bulk carriers my last company worked with struck a jetty in Canada one day. I did some math on the forces involved, and to accelerate a ship of that size from 8 knots to 0ish in that short a period of time was equivalent to 10 or so 747s at full thrust.
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Mar 26, 2024 23:40
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https://i.imgur.com/rOmNdKC.mp4
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Mar 26, 2024 23:47
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Big Mac posted:equivalent to the thrust of 82 solid rocket boosters from the Space Shuttle. Those darn Kerbals.
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Mar 26, 2024 23:48
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https://i.imgur.com/eytOqhm.mp4
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Mar 27, 2024 00:09
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Okay, one of those is obviously fake.
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Mar 27, 2024 00:20
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I've read that those big rear end container ships are direct drive, from the engine crankshaft to the propeller, so how do they reverse? Can they change the pitch on the proppeller?
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Mar 27, 2024 00:27
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Wait, we've all been asking the wrong question. Why was a container ship leaving a harbor?
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Mar 27, 2024 00:32
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wesleywillis posted:I've read that those big rear end container ships are direct drive, from the engine crankshaft to the propeller, so how do they reverse? Can they change the pitch on the proppeller? They simply run the engine backwards Scholtz posted:Wait, we've all been asking the wrong question. Because, you see, ships are safe in a harbor, *~but that's not what they're built for~*
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Mar 27, 2024 00:33
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Bad Munki posted:Okay, one of those is obviously fake. I think the Nokia phone one was one of the play-doh creations they crush at the end of videos
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Mar 27, 2024 00:34
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Oh so that’s what reverse engineering is!
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Mar 27, 2024 00:35
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Scholtz posted:Wait, we've all been asking the wrong question. The footage was reversed
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Mar 27, 2024 00:35
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Scholtz posted:Wait, we've all been asking the wrong question. It was filled with ambulances.
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Mar 27, 2024 00:37
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Bad Munki posted:Okay, one of those is obviously fake. Yeah, they used playing cards instead of real money.
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Mar 27, 2024 00:38
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That's how you cut the deck.
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Mar 27, 2024 00:40
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Container ships are made for going forward. Anything fancier than going forward is usually left to tugs.
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Mar 27, 2024 00:40
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NoWake posted:Because, you see, ships are safe in a harbor, *~but that's not what they're built for~*
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Mar 27, 2024 01:01
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wesleywillis posted:I've read that those big rear end container ships are direct drive, from the engine crankshaft to the propeller, so how do they reverse? Can they change the pitch on the proppeller? They actually have a second set of cams that slide into place to run the engine in reverse. If I recall correctly, the crash astern procedure involves slowing the engine way down, sliding the reversing cams into place, and using pressurized air or steam to get the engine spinning backwards until it can start dieseling on its own. Edit: here it is, copied from a chemical tanker I did some work on once. quote:Procedure: CARRY OUT THIS PROCEDURE ONLY IN REAL EMERGENCY Some ships do have variable pitch propellers, but I think they're less common as dwt gets larger. Safety Dance fucked around with this message at 01:09 on Mar 27, 2024 |
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Mar 27, 2024 01:04
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Big Mac posted:doing some quick loving around with Wolfram Alpha, I'm seeing that 115,000 tons, moving at 5 knots, is equivalent to the thrust of 82 solid rocket boosters from the Space Shuttle. Humbug Scoolbus posted:Well, the Locust Point Marine Terminal which is now blocked because of the accident, is the largest RORO port on the Eastern Seaboard and is tied into the rail and road network that needed to use that bridge. The harbor speed, I believe, is 4-6knots max (I seem to remember that from when I lived in Fells Point), and at over 100K tons, even at 4 knots that's a fuckton of kinetic energy that will vaporize pretty much any structure that it hits head on. Xerol posted:I think it's 6 but the governor said it was moving at 8 when it collided. Either way it's a fuckload of momentum. I punched these numbers in based on what was said at that press conference and yeah I don't think they designed it to handle a 788887. Compared to the WTC that pillar was a toothpick, and you're throwing about 4 times as much energy into it? i did some quick loving around calculations at work but for energy absorbed, which based on my loving around research is the main way these bridge dolphins/protections systems are rated. the sunshine skyway bridge in florida has a protection system rated for a hit from a 87,000 ton ship at 10 knots. the ship that hit the key bridge in baltimore was reportedly 117,000 tons and traveling at 8 knots. calculating the kinetic energy of each, the ship in baltimore had 86% of the kinetic energy as the skyway bridge protection system was rated for. so it does seem like a protection system can withstand a direct hit from a ship this size. but key point, it has to be direct hit, not oblique like in baltimore, which looks like the ship dodged any protection system in place. this seems to be the place on the forums that this accident is getting the most technical discussion, so if any nerds know more about these systems than i do (basically just what i could learn today) then please correct me.
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Mar 27, 2024 01:17
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Safety Dance posted:They actually have a second set of cams that slide into place to run the engine in reverse. If I recall correctly, the crash astern procedure involves slowing the engine way down, sliding the reversing cams into place, and using pressurized air or steam to get the engine spinning backwards until it can start dieseling on its own. Almost every ship that size is using a fixed gear with fixed prop, the only time you have something different is for things like cruise ships which have aziothrusters so they can crab into and out of various ports 6 times a week. Or it's a steam plant with reduction gearing, but those are getting rarer.
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Mar 27, 2024 01:23
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Safety Dance posted:They actually have a second set of cams that slide into place to run the engine in reverse. If I recall correctly, the crash astern procedure involves slowing the engine way down, sliding the reversing cams into place, and using pressurized air or steam to get the engine spinning backwards until it can start dieseling on its own. Where's the part about shooting nitromethane into the ship's engine for quick horsepower?
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Mar 27, 2024 01:51
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Pigsfeet on Rye posted:Where's the part about shooting nitromethane into the ship's engine for quick horsepower? Real ships use nitromethane plus Hydrazine for that added boost
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Mar 27, 2024 02:02
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Karate Bastard posted:They did a terror on it They got it stuck in the Arctic ice and killed the crew with a vengeful polar bear spirit?
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Mar 27, 2024 02:11
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Karate Bastard posted:They did a terror on it I do have to say that as soeone who spent too much of my 40s drinking my way through the Bush & co response to 9/11, it is incredibly refreshing to not see TERROR ALERT bullshit being flogged across every mass media outlet in the US every time a school bus has a flat tire. I'm amazed that my liver & kidneys survived it. Me & my neighbor were kicking a half-keg every week.
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Mar 27, 2024 03:02
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PainterofCrap posted:I do have to say that as soeone who spent too much of my 40s drinking my way through the Bush & co response to 9/11, it is incredibly refreshing to not see TERROR ALERT bullshit being flogged across every mass media outlet in the US every time a school bus has a flat tire. This is an odd choice of drinking game. Couldn't you have just done the one where that kid in Dazed and Confused touches his face?
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Mar 27, 2024 03:15
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"Islands of Sanity In A World Gone Mad" was one hell of a game.
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Mar 27, 2024 03:17
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https://i.imgur.com/InuoJIb.mp4
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Mar 27, 2024 03:26
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Antigravitas posted:Idle speculation: A maintenance regime that you can charitably call "neglectful", leaving out the "criminal" only because of a technicality of jurisdiciton. Engine failure at an inopportune time leading to loss of rudder control, and away it went. I saw a reddit post last night (that I can't find right now, so grain of salt and all that) saying that the same ship had a power failure last year and slowly hit a dock somewhere else in the world. Has anyone heard anything about this?
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Mar 27, 2024 03:30
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Safety Dance posted:Procedure: CARRY OUT THIS PROCEDURE ONLY IN REAL EMERGENCY As someone who occasionally has to work on old Gardner engines in tugs... This here is username/post combo. That poo poo would be loving terrifying to have to do in real time.
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Mar 27, 2024 03:49
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Megillah Gorilla posted:I saw a reddit post last night (that I can't find right now, so grain of salt and all that) saying that the same ship had a power failure last year and slowly hit a dock somewhere else in the world. From https://www.thebaltimorebanner.com/community/transportation/dali-cargo-ship-hits-baltimore-bridge-QY2M32XFPRDMHM34RKVPK3TR3Y/: quote:The vessel was built by Hyundai in 2015. Of the 27 inspections for Dali logged in an online database maintained by Electronic Quality Shipping Information System, two noted deficiencies. In 2016, one report logged damage on the hull’s ship. That year, Dali hit a stone wall while unmooring at the Port of Antwerp. The vessel reportedly sustained minor damages and was detained for repairs. In June, another inspection found problems with “propulsion and auxiliary machinery.”
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Mar 27, 2024 03:51
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One bit that's gonna be interesting is that I-695 is the Hazmat route for I-95.
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Mar 27, 2024 04:01
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