THUNDER BAY - what causes the sudden tilt?

Подписаться 8 тыс.

Просмотров 17 тыс.

50% 1

(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.niagarawel...
Muisc:
Cowboys & Dreamers
Cody Martin
NZRTR1HNQQZW5CZU

Опубликовано:

11 сен 2024

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 42

@dedogster 3 месяца назад

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

@miloswanson9646 3 месяца назад

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.

@robertf3479 Месяц назад

That would be my guess as well, single screw ship with a long, narrow hull.

@jimlem2075 3 месяца назад

More than likely tilted because of the bow thruster pushing against the canal wall.

@ronw59 3 месяца назад

My thoughts also.

@user-qo5hh9bw4w Месяц назад

Thanks. I've known very little about the Welland. Gives me reason to learn more.

@stanpatterson5033 2 месяца назад

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.

@NigelHay 2 месяца назад

I can clearly remember that there was no sound, only thing was the sound of water that was pretty much a constant sound

@The_DuMont_Network 2 месяца назад

The "tilt" is called a "list", btw.

@Zzrdemon6633 3 месяца назад

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

@NigelHay 3 месяца назад

Thanks for your reply. It's a mystery, hopefully a member of the crew might see this

@caliber2410 3 месяца назад

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.

@scotabot7826 3 месяца назад

Yes bow and stern

@Cletrac305 Месяц назад

I would suspect that it is a combination of an effect of high velocity water between the ship and the wall and possibly bottom on that side from movement in a confined space reducing the pressure between them, this has caused ships passing too close to each other to inevitably collide, and too high a speed in shallow water to suck a vessel down. Both the bow thruster and the rudder are below the centerline of gravity. They were trying to "walk" her away from the wall and had to apply RIGHT rudder to kick the stern out. And the thruster to push the bow out to break the one-sided vacuum resulting from not having a wall on the left side anymore. Both of these forces act to push the bottom to the LEFT. large vessels initially heel in the OPPOSITE direction of the turn if sudden rudder inputs are made as the stern is kicked out from under them until the turn is developed and centrifugal force leans the top back over. Screw torque probably has a minimal effect, however, if it was a standard right hand rotation engine, it would react this direction, and throttling up momentarily to blow water past the rudder may have been a factor. So, we have at least 4 possible forces acting together to cause this. The center of gravity is higher than you may think even when loaded because they have narrow V bottoms in the holds to funnel materials onto the conveyor belt. However, it looks like she is running light and high, raising the CG and having less mass to resist movement. ( Intersting fact: Lakers are called boats and do not, in general, use any nautical terms. They use mph, left, right, etc, and eat out of kitchens, not galleys and have bathrooms not heads) Great video!

@NigelHay Месяц назад

The number of times I've had people calling me out for not using correct terms and now I've just learnt this. Thanks for all the information, you gave me and others are very good explanation. Thank-you

@bongobrandy6297 3 месяца назад

Don't come a knockin' if this boat is a rockin'.

@user-pc6ql2xl8x 3 месяца назад

Good that you took my comment to heart. Thank you.

@LeeB48 3 месяца назад

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.

@johnandersonjjr Месяц назад

I assume the rail bridge(s)crossing over the locks is the line from Niagara Falls (bridge st) to Toronto.And the buildings in the background is the GM (engine)plant.

@NigelHay Месяц назад

Yes you are correct, freight and passenger trains (Amtrak and GO)

@rael5469 3 месяца назад

"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.

@kevkev3445 Месяц назад

I live in thunder bay so the title confused me. But I also work at the port in town and have seen this ship lots and tied it up to a dock a few times.

@NigelHay Месяц назад

I live in Thunderbay too, thunderbay area of Ridgeway. Very confunsing

@charlesprice7790 Месяц назад

I'm guessing it's from the bow and stern thrusters getting her off the bank and more into the channel

@kenvandeburgt1232 3 месяца назад

Crew running from one side of the ship to the other? Probably bow thruster or propellor/rudder effect.

@John-dm2ik 3 месяца назад

Up to Lake Erie, not down. Perhaps you could explain what those three yellow units are that are built into the canal walls.

@davemiller3856 3 месяца назад

John up or down is with the flow and the yellow units are automated mooring (hands free)

@NigelHay 3 месяца назад

Thanks Dave for the reply to the question.

@GWNorth-db8vn Месяц назад

@@davemiller3856 - The buoys on the east side are black with green, which means that's the right bank and North is downstream. Lake Erie's also hundreds of feet higher. Definitely up to Lake Erie. It's the same escarpment as Niagara Falls a few miles away.

@The_DuMont_Network 2 месяца назад

I understand the locks and their operation, but for what are the yellow cranes (one per lock, it appears) used?

@stanpatterson5033 2 месяца назад

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.

@user-lv8fi7ci6z 3 месяца назад

I didn’t see in the video the “tilting” you were talking about. I wonder if it was dragging on the bottom?

@stanpatterson5033 2 месяца назад

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.