Thanks for the amazing response everyone. I just wanted to address a few points raised in the comments. I like to keep things as accurate as I can so do continue call me out when I get things wrong and I'll correct anything needed. Hull Speed - is not actually a speed limit. As many have pointed out, it is just when the vessel's length equals the bow wave length. It doesn't actually restrict a vessel's speed. HP - is used purely for ease of comprehension as it is easier to visualise than kW. Drag - it does depend on numerous factors, but I kept it as a cross section alone as the main point was to illustrate the way it increases with speed. Obvious Answer - maybe, but the purpose of the video is entertainment. I have plenty of tutorials on the channel so am making videos like this for fun. Again, thanks for watching!
Slightly wrong about the drag equation. It is uncommon to use d to represent density, which is a very important factor as the density of water is much greater than that of air and is the main contribution to the drag force. Secondly, for low speeds, drag is said to be proportional to v not v squared. This is because drag force is not something that is fully understood and the equation is just an approximation. For low speeds, it is impossible to tell the difference between quadratic and linear proportionality. For high speeds however, it will be very obvious.
Hull speed absolutely is a speed limit when operating a displacement hull. Unless you push it onto plane, which takes exponentially more power, especially for a hull not designed for hydrodynamic lift.
25 knots is about 50km/h which is pretty fast. Thats pretty fast for large vessels. I work myself at an offshore construction vessel and we usually inly sail in 8-9 knots. About 3 knots in heavy waves.
Burrito Bowl01 Somewhat lighter = moderately lighter when compared with the greater magnitude of difference between a car and airliner or airliner and cargo ship.
@@fred2796 He's talking about the weight. The difference between the weight of the jet vs the weight of the normal sedan is greater than the weight of the sedan vs the weight of the F1 car. He's not talking about the difference in Horsepower or the Horsepower to ton ratio.
In fact that's the main reason, haha - think about a car that only has 0,5-1 hp, haha. That would be much slower than the ship, just because of the rolling resistance of the tires. Even though the ship has a lot of drag going in water, that resistance doesn't scale up at the same rate as the weight (wich is also why large ships tend to be faster than smaller, like he said in the video) - so compared to it's weight, a large ship has lower total resistance moving forward, than a car. But a train or even a tram would in fact be able to go like 60-80 km/h (about 32-43 knots) since it's rolling resistance is like 1/10 of a car, compared to its weight, and the air resistance doesn't get very high either, at those speeds. Although, even a rail vehicle would not be useful with such low power, since it would take "forever" to get up to speed and also going uphill would be a problem - even a quite small hill would slow the vehicle down to walk speed (this is something a ship doesn't have to deal with, going on a water surface, that by it's nature always stays perfectly flat). A plane would need far more than 0,5 hp/ton to generate enough lift to even be able to fly at all, regardless of wich speed it's going - so that's out of the quiestion, hahaha
@@Speeder84XL But trains often do run at that kind of ratio. The difference is that a diesel locomotive is only using it's diesel engine as a generator so it really can't stall and you get the benefits of electric motors for the actual driving. Diesel locomotives are pretty heavy and have all wheel power delivery trough electric motors, combine that with really low rolling resistance on rail and they are really really good at draging crap on rail. The country I live in is relatively flat so you get stuff like this ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-10h-jE8cfV4.html these 2 section locomotives have ~4600hp combined and the consists they are pulling are ~5000 tons so we're under 1hp/t here and it works pretty well.
@@GreatGodSajuuk That's true - I didn't thaught about those really heavy freight trains. They can indeed make it with similar power to weight ratios. Once they get up to speed, they can also often go up small hills quite easely using their momentum (since there is almost nothing except gravity, that slows them down) :)
Speeder84XL is the ocean that these overgrown boats sail the globe on really perfectly flat? Or do does it wrap around the globe? Do you really believe that the earth is flat?🌏
I'm so glad there's a channel out there covering nautical topics. My father was in the navy, so I find these topics fascinating, but most people I run into have no interest in them. I hope this grows into a mega-channel.
Someone was saying that they think RU-vid did it, because they had already seen this video and the first time there was no blurring. I think I can further testify this as now its not only the F1 car, but also the logo on the side of the ship as well as some of the other images he used. Like when he was talking about the faster ferries, there were literally two images that were just straight blur.
In 1976 I joined a container vessel in Southampton, spent a day loading and sailed. Through Panama Canal, Tokyo, Kobe, Hong Kong, Singapore and back to Southampton around the Cape of Good Hope. This took 59 days, the vessel averages 26 Knots, 950ft long 103 ft beam. I think that's fast. Carrying , loading and discharging containers.
There is another important factor missing which is hull speed. Slightly simplified, a ship in displacement mode (as compared to planing mode like a small RIB for example) will create a wave system and at a certain speed it will sail uphill on its own wave. The hull speed is increasing with the length of the waterline so this is more of an issue for a recreational 10m sailing yacht (hull speed 7.6kn) and has a more limited effect on large ships (400m vessel -> 48kn) but its effects are noticable in terms of fuel consumption. And this is another very important factor that is a bit missing here. While it is possible to build container ships that sail faster than 20 knots it is simply not economic as nobody would pay extra for a 1 day faster shipment from China to Europe.
As a freight forwarder in europe i can tell you people pay extra for 4 days off the total transit. So much that carriers offer usually 2 services (MD1 and MD2) to get from south europe to main ports of china
I was in the US Navy in my youth, a half century ago, and served aboard Gearing class destroyers, built at the end of WWII. These were 3540 ton vessels that were about 120 meters long and 13 meters wide at the beam. Powered by 60,000 hp steam turbines, they could reach speeds of 33 kt's (36-37 mph). My paternal ancestor came to America from England in 1638 on a wooden sailing vessel, arriving in Boston after a 50 day crossing at an average speed of 2-2.5 kt's. What contrast in speed and crossing time, the 300+ years brought.
He also said that the average car has 100 hp. Maybe British hp is significantly different but I can't think of any car with 100 hp besides a smart car. Most economy cars are in the 150-220 hp range.
@@MrCody01 In the US, yes. In Europe most people buy 60-150hp cars because engines with higher power output usually consume more fuel, which is expensive as fuck in most of Europe (e.g. $6+/gal (US)). Cars with higher displacement engines are also taxed heavier --> fewer people buy them. Besides that, for the average person 100hp is more than enough in day-to-day life. Hell, even my 85hp Golf Mk7 could fly down the Autobahn at 115mph.
As someone who has witnessed a container ship leave to head out to open sea in a shipping lane ( I was piloting a gillnetter when they passed about 150 feet directly in front of me) I’ll say they can move pretty fast for their size.
A video concerning the actual work done might be interesting. The ship will move X tons of actual freight (minus the packaging, sea level protections, cooling apparatus) which would require Y amount of cargo planes (minus etc) which in turn uses up Z units of energy per tonne. One beautiful day ships and planes will move in KPH. Miles and knots as much as we love them need to take their place in museums.
Another great consideration worth acknowledging is that air the higher you go is less dense. Therefore drag is minimized allowing aircraft to travel more fuel efficiently and at an increased speed. But an aircraft can only dream of carrying the capacity of ships. Amazing engineering went into these vehicles!
The feather doesn't fall slower because it experiences more air resistance than the ball. It falls slower because the air resistance per unit weight is higher.
The highest speed of a vessel depends not of the cross section. It depends only of the lenghts, because the wave speed depends to the wave lenght and this limited the maximum speed. Speedboats are glider and so imaginary so long as the wavelengts of their speed.
Container ships used to be a little faster but they slowed down to optimise fuel consumption, freight rates are not very high right now so every dollar counts.
The engine allready powerful and fuel efficient. Many company put their attention on fuel efficiency and and the engine were make across the ship design and characteristics. And do you know how its feel driving a thousand tons steel even at 12 knot? 😅 let me put you on the wheel
Because Ship carries cargoes or passengers, or anything, just like a mother that carries unborn child. Also Cars labeled as "she", i think any vehicles that carries within or inside labeled as "She"
You couldve used a prop plane as a HP comparison (yes i know a prop is a lot slower than a jet, but it can cross the atlantic, though im not sure about the time)
The 30 second answer: Planes deal with friction. The higher a plane is, the lower the air density, therefore less friction = less fuel consumption + higher speeds. Cars deal with weight, height from turf, and traction. The better your tire grade, the better your traction, the faster your car. The lighter the car + the closer your vehicle is to the ground = greater down force = faster car. Sea vessels deal with buoyancy. There is little traction in or on water. Try running full speed at a pool and running on its surface. it wont work. Try running on a track and then applying the same force and physical exertion while in water, see how you move slower? It's not a solid object and therefore the amount of traction gained is minimal and the friction is high as you move through it. Edit: this is excluding speed boats as they sit mostly on top of water with carbon fiber frames (as well as the lack of a head, cabin, saloon, bridge, etc;), weigh far less than your average yatch, and usually come with around 500 to 800hp and sometime higher depending on how bat shit insane the owner is.
Your average Fletcher weighed in at 2,050 standard displacement. The Tribals and re-built Fubukis were similar. All of which were fairly large compared to earlier destroyers.
If you want to save 7 minutes: Ships have more mass so they go slower even with huge engines. Speed increases resistance, so going faster reduces efficiency. A ship also needs to be able to stop in a reasonable distance, a plane doesn't.
An ocean liner can do a trans transatlantic crossing in 3.5 day, the SS United States did that in 1952; a dedicated ship built today could improve that time, but sadly cruise ships are built to be slow and cargo carriers do not need speed but efficiency.
I guess it's got something to do with drag. Moving slowly in water isn't too difficult. But going twice as fast might require more than twice the energy. So going 10mph might require 10kw of power. But going 20mph might need 40kw of energy. 30mph could require 100kw of energy, so it's a rising curve.
My father is a seaferer and manages container bulk ship. It's interesting to stay on a ship the least but I don't want to become one. I don't want my future family to experience long lonely months without seeing and touching them firsthand. The pay is good but it's a risky profession and it's quite developmentally (growing up) damaging.
This is so cool!!!!! I was wondering why all ships are slow... Even the Navy ships like Corvettes, Destroyers and Frigates etc. 😅😅😅 And yes the torpedoes too. 😅😅
Every day is an opportunity to learn, sometimes you learn things that others would have thougth obvious, but that should not diminish the value of what you learnt. Everyone is at a different stage of life and personal development. No two people are the same. Taking a condescending attitude towards those who have only just found out about something only serves to stroke your ego and screams insecurity. I hope you have a great day and truly learn to appreciate how everyone struggles and how that is OK.
@@grotescoguru grotescoguru grotescoguru You know what, i have learned something. I learned that assuming the characteristics of a person without actually knowing said person is akin to jumping off a tall cliff while blindfolded. I've learned that condescending to someone while acting condescending themselves is hypocritical , and likewise belittling someone while at the same , ...paradoxically, ... Speaking positively towards them is like burning your hand on a stove top burner to rid your freezer burn, which you put back into the freezer because you just burned your hand on a stove top. All the while you are about to be hit by a Container ship that, not surprisingly , goes at a predictably slow speed, because gravity, and physics, and basic understanding of how thing work. But that's just me.
What's with all the pixelating?!? I mean, you pixelated an F1 car. Did you get a bunch of blow back from all the shipping companies and F1 Racing? Jeez. Tell them to lighten up.
@@TimothyChapman Wow. Shows how "out of touch" I am technologically... that never even occurred to me but makes so much sense. AI is wicked cool but scary. Thanks!
Vehicles do not experience friction. Not in the way it is implied in the video. What causes vehicles to have a limited speed is aerodynamical drag, tire rolling resistance (due to energy loss inside the rubber) and viscous friction on all oiled parts. Friction with the ground plays a completely opposite part: it pulls the vehicle forward. Remove that, it will never move - unless moving down a slope, of course.
Hello! first time at your channel. cool videos. i would love to see more videos related to the shipping industry. I am amazed at how trade works so efficiently around the world. thank you for your time
Did you know that the way they spell the name MAERSK is actually because the guy who founded it, to whom it is named after, who's name was Mærsk, and was from Denmark, but here we use the letter 'Æ' which isn't in the international alphabet, so he called it MAERSK rather than MÆRSK so everyone could spell it.
0:54 Shows ship with bulbous bow. Also shows a sine-wave at the waterline that the bulbous bow is specifically designed to counter-act, as taught by another of your videos...
Objects that are said to be undergoing free fall, are not encountering a significant force of air resistance; they are falling under the sole influence of gravity. Under such conditions, all objects will fall with the same rate of acceleration, regardless of their mass.
hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm thats a good question
When something copy righted or something shows up, instead of talking down the video youtube shows the creators where to censor so they do that. It sucks but at least we get to see the video. Gotta add, fuck this censorship bro.
