THUNDER BAY - what causes the sudden tilt?
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- Опубліковано 17 тра 2024
- (First posting of this vlog I decided to remove due to a narration and a singular graphic error, I had stated Lock 3 when of course it was lock 4)
Footage from the ground and up above as I send the Drone up to take a look at Thunder Bay and Lock 4 of the Welland Canal. What a view!
As Thunder Bay exits the Lock, I notice that the ship very quickly leans one way and then another, several times. (several inches).
What causes this sudden motion? Ballast? If you can answer this please do so in the comments.
My only thought was Ballast, but I don't recall seeing a Ship do that after exiting a lock.
Welland Canal: www.niagarawellandcanal.com/
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Cody Martin
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I loved my trip down to Welland many years ago, my favorite sight was a ship going through a corn field! You couldent see the canal from the road , such an odd sight! I need to go back there
Good that you took my comment to heart. Thank you.
Does a ship that size have both bow and aft maneuvering thrusters? Seems to me they were engaging them to get centered in the channel, which may cause a slight heel like that. You can see some starboard prop wash around the 5:10 mark.
Yes bow and stern
More than likely tilted because of the bow thruster pushing against the canal wall.
My thoughts also.
Some have suggested that she struck bottom, or scraped the lock sides. Well, I very highly doubt that it touched bottom, and if it had touched sides, I'm quite certain you would have heard the sound. I'm going with the theory that some others have purposed.... thrust torque, while applying power to the shaft and propeller. Only a guess, though.
I can clearly remember that there was no sound, only thing was the sound of water that was pretty much a constant sound
good job
My layman's guess for the 'lean' would be torque cause by her screw/propeller against the water -- the same as your rear-wheel-drive car will 'torque'/twist on acceleration.
If the ship is loaded I doubt very much they are playing with the ballast at the moment of leaving a lock, same as if it's unloaded not really the time to be playing with shit, I wonder if it's currents from the water leaving the lock? But I do suspect it the torque effect of engine from the props restarting? I know on small boats it would tip the boat over quite a bit till you adjusted the trim tabs for a flat ride
Thanks for your reply. It's a mystery, hopefully a member of the crew might see this
"what causes the sudden tilt?"
Maybe the bow thruster. The bow thruster is down low. Maybe it imparts a slight twisting force to the ship.
Don't come a knockin' if this boat is a rockin'.
I understand the locks and their operation, but for what are the yellow cranes (one per lock, it appears) used?
They do look like cranes, but they really aren't. It's merely a boundary defining instrument. There will be one at either end of each lock, and as a ship enters, the yellow gate will be down at the far end, and this gate will define the limit of travel that the ship must observe prior to entering AND while positioning inside the lock. If they hit the gate, it's considered the same as your toes or feet crossing the foul line in a bowling alley, only the penalty for doing so at a bowling alley won't get you thrown out, maybe just yelled at. Okay, so that last part was merely light-hearted sarcasm.
The gates are to tell the boat where they cannot exceed, lest the boat hit bottom during the lift or lowering function. There needs to be space left both ahead of, and behind the ship, to avoid fouling the movement of the lock doors, and the inrush of water coming from the lock above, so the last thing they need is for a ship to be obstructing view, or crowding the operation. The gate would likely not hold or stop a lake freighter should it over-run, but still, there would be some space between the nose and certain danger, a few precious seconds for a ships' crew to get stopped before striking a critical piece of lock infrastructure. Gates are easily replaceable, and sometimes they do get hit. Usually, you can see spare gates sitting, placed parallel, beside the lock.
Edit: I just went back and re-watched, and noticed that, as you said, only one per lock. Other locks have 2 per lock, one at each end for whichever way the ship may be going.
Down at Port Colborne ?
The "tilt" is called a "list", btw.
Up to Lake Erie, not down. Perhaps you could explain what those three yellow units are that are built into the canal walls.
John up or down is with the flow and the yellow units are automated mooring (hands free)
Thanks Dave for the reply to the question.
Crew running from one side of the ship to the other? Probably bow thruster or propellor/rudder effect.
I didn’t see in the video the “tilting” you were talking about. I wonder if it was dragging on the bottom?
You can see it begin around 6:26 on the video. Watch the very lowest part of the hull, you will see it show a line of darker paint (because it is wet, rising up out of the water) and then after a few seconds, you can see that darker line settle back down again. It oscillates a few times. But it is a very subtle amount of list and correction, easy to miss.
I think the most likely reason for the ship to heel like that is she may have landed on the wall on her starboard side or possibly landed on the center lock wall with her port quarter while maneuvering to clear the lock Either one could cause the ship to heel as you recorded. While trimming the ship by moving ballast can be done fairly quickly, it would not happen the the matter of a few moments.
Do you ever feature American vessels in your vlog?
If I come across one I will. I hoping to spend a weekend down by Detroit River late June and I am sure I'll find one of those 1000 footers.
Here I thought this was about the city not the boat