How Seawater Sabotages Ships: Crash Course Engineering #43
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- Опубликовано: 10 апр 2019
- This week we’re headed out to sea for some marine engineering. How do we design ships to handle aquatic environments? How do we deal with marine life and corrosion and all of the other problems that come with engineering in the ocean? How can large maritime structures be built on land and transferred into water?
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I am a Marine Engineer & I congratulate you on the Accuracy of the Information in your Video. Very illustratious & knowledgeable... P. S. : Ships are designed by Naval Architects & operated by Marine Engineers... More power to you... 🙏
As a marine engineer i'm impressed by all the topics you've managed to cover.
I'm also planning to become a marine engineer and I'm trying to learn about it. I have some questions if you are OK with it
@@53darkknight53 Sure thing
@@fuunfun
Which part of the job you're working right now? Is it on the ground or sea? Also, I heard that many people say "being on the ship with same people for months is boring". Is it really that boring or do you actually have some work to do?
Marine engineers tend to have an analytical mindset, with an easygoing attitude.
They can appreciate the real differences between an “emergency” and an “urgency.”
The only BS they will give you is how much time it takes to fix stuff.
The actual time in their head is the “in a perfect world” time.
So, they lie to you, and to themselves, and typically pad an extra 50% for unforeseen complications.
After that fudge factor, most of the time it comes out to be pretty close.
So, go with their recommendation because their BS has merit.
@@53darkknight53 I'm currently working on land. There is always something to work with on a ship. Yes and no, long periods without your family or friends can be tough. usually the pay and a nice crew will outweigh the tough times. Having said that, as a marine engineer you are not bound the work on a ship. You could work in alot of different fields and still travel all over the world.
Guess who doesn’t sabotage ships. Wait for it....the Mongols
If anything, it's their ships that got sabotaged.
Kamikaze Hurricane wants to know your position
Congo Pygmies.
Technically, A ship designer is called a Naval Architect, who is the person dealing with all the aspects you've covered in the video. The engineer who works onboard is called a Marine Engineer. Thanks for the well-made video.
@cringelord the engineer officers onboard the ships are also marine engineers. They still need to know their stuff.
@cringelord I'm training to be a marine engineer who works on board, and yes the motormen, Oilers and whatnot are like mechanics, but the officers are qualified Marine Engineers. They could land a job ashore in a shipyard if they wanted to.
Shipping? Oh you mean actual shipping...
There is the art of Shipping, and then there is the boring transfer of goods across water.
What about the art of transporting your fanfic lovers across water?
@@StephenGillieShipping shippers.
@@StephenGillie frick it, Titanic × ship wreck is canon
I believe you meant “hydrodynamic” instead of “aerodynamic.”
In the age of sail, sacrificial sheathing of cheap, low quality wood was added to the hull to protect the actual planks underneath from fouling - especialy the shipworm, a crustacean that burrows into the wooden hull, slowly destroying it.
Later copper sheathing was used instead, as the toxic effects of the copper effectively prevented foulign to occur in the first place.
Thanks for sharing videos you have inspired me to create my own
MMMMM so good. I'm going to have to watch more of these.
Very interesting, learned a ton of new things.
*But in the end, we sabotage the seas more than the other way around...*
CrashCourse is best Educational channel of RUclips........😊✌🏻
Barnacles just be like...I has a grip and I'm not lettin' go!!
i love this show!
6:51 Well ACTUALY it would make the ship less HYDROdynamic not less AEROdynamic
well ACTUALY the engineering part of it is the same thing
What about lake & river water, & areas where seawater & freshwater mix? More engineering problems.
Brackish
4:15 Missed opportunity for a "Don't hug me I'm scared" reference!
I think it's worth mentioning that when the Navy designed the new submarine propeller, it wasn't to prevent damage to the propeller, it was to make the submarines harder to detect underwater by preventing the noise of cavitation. Passive sonar is very important for submarines, and staying as quiet as possible to avoid detection is a great strategy.
6:52
Pretty sure she was supposed to say hyrodynamic.
*I am not quite a marine engineer, but this seemed like a pretty good episode. This might've been a good opportunity to talk about fatigue and fracture, though.*
thank you
So this is what I have to study to make Bioshock real
It is what you have to study to become confident that Bioshock is fiction
No way there has already been 43 crash course engineering videos🤯
I am planning on joing the Canadian Coast gaurd college as a Marine Engineering, I like talking apart things and have been told I am a very inquisitive person. I also have learnt to sail at 9yrs of ags and live right by the Atlantic ocean. I love a adventure as well. Is this job suited for me?
a gameboy? cool!
Ayee wheres my naval arch and marine engineers at
Shipping engineering has a lot of ships that ship our shipping and handling
At 6:53 wouldnt it be hidrodynamic since it's going throug water?
*Hydrodynamic and yes you're technically right but actually no since both are essentially the same thing in that they're dealing with how much drag results from fluids (both air and water are fluids) moving over an object.
please do about...architecture discussions right after the whole engineering stuff. I would highly appreciate it and for the others to know more about architecture
Damn you seawater. Lol.
Is there such a thing as under water drones? Unmanned or hobby class?
I wonder if it would look like small subs?
Hobby drones have 4 arms and look nothing like helicopters b/c there's no need for a person to sit in it and for added stability.
*Remotely-controlled submarines have been around for a long time, both for hobbyists and for professional usage. Perhaps one of the most famous was that which was used to discover the wreckage of the Titanic. I've never seen a consumer model of impressive quality, but I did get to see a fancy professional model which used to inspect damage to a lock gate at work last year. It cost a lot of money. I think they tend to have tethers, but that doesn't necessarily disqualify them from being considered "drones." Though the popular term would be "ROV," or "remotely-operated vehicle."*
Can barnacles stick to Teflon?
The steam bubble formed form the low pressure areas of the spinning propeller and the subsequent collapse of those bubbles near the surface of the propeller is what causes damaging cavitation. A similar thing can happen in a centrifugal pump. When large pumps start to cavitate they sound like they are trying to pump rocks. Cavitation is a phenomenon in which rapid changes of pressure in a liquid lead to the formation of small vapor-filled cavities, in places where the pressure is relatively low. When subjected to higher pressure, these cavities, called "bubbles" or "voids", collapse and can generate an intense shock wave. Wikipedia
3:54 секретное топливо 7
❤️❤️❤️
"A cubic meter of water weighs a metric tonne" - Doing the conversions to American, it's a significant body of water - 264 gallons, weighs just over 1 non-metric ton as well. (2112 lbs)
1st crash course lover and comment writer
The most common way of building a large ship is to build it in units. Then assemble these units on a slipway. Building consumes a considerable amount of time; therefore, it's better not to occupy a dry dock for such time.
I HATE your shelves.
Just had to make sure it was known.
Have they always been there? I'm in love with the things.
Why does antartica have a great big hole in the start?
This is how ship gets done.
I guess u meant screws rather than propellers 😌
Propeller
noun
a device having a revolving hub with radiating blades, for propelling an airplane, ship, etc.
Propeller and screw are interchangeable.
Then how come most airplanes don't have propellers at the rear? Why do ships typically not have their screws at the fore?
You can literally use literally to mean figuratively and and technically it's right.. but you can also be precise, and engineering is founded on precision.
Please Crash Course Archeology and Crash Course Theology
When I was younger, I used to think when my Mom ordered something it was sent in a rocket ship to outer space. Cause you know, Shipping, Space Ship? No, Just me?
i want some tea...
At least they dont have to deal with German uboats anymore. Merchant Mariners in ww2 they had some tough seas.
Nice video, but it would be easier to comprehend if there is more graphics and slower taking as there are alot of information
one could play it on 0.75 speed with closed captions
Ships and submarines does not use propellers, they are called screws.
Do they Propel the ship or submarine forward and back words depending on their spin? They are propellers
@@Skepticfornow Negative, the inclined planes rotate around a central hub and literally screw the vessel through the sea. If you don't believe there's a difference, meditate on the dearth of either airplanes with their propeller abaft or ships with their screw forward.
If you can't engineer a better understanding from that,
You should probably just go propeller yourself. Heh
Training marine engineer here, and I've never heard it been called a screw.
@@Skepticfornow The thrust bearing propels the ship, not the propeller, or 'screw'
Congratulations on your host position on your new show
I'm only here to see why pikachu is on thst ship
She looks like a princess 👸🏽 in a Disney movie
But do ships ruin seawater?
Oil spills, bilge dumps, whaling, illegal fishing, bycatch, noise pollution, prop strikes, subsurface well blowouts, etc etc
@Anthony What about sail boats?
Aluminium. It is aluminium. And zincum, ferrum, cuprum, etc.
Great video! It took men hundreds of years to develop and perfect this incredible technology. And now, a women can explain it to us in this marvelous presentation.
Why does the gender of the presenter matter?
@@treeinafield5022 So, you object to complimenting a woman on a job well done. That attitude is petty and sexist. My advice to you, is to judge people based on merit, and publicly acknowledge their accomplishments.
@@BoffinGrusky nice try there bud, but we all know what you meant in that original comment, you can't then turn the sexist accusation on me.
@@treeinafield5022 "we all know what you meant"? Or is it a case of the offended searching for an offender? Are you intimidated by women?
I'm bothered by the fact that she has a British accent, yet pronounces Aluminium as "Aluminum".
Beefheart Vandercrease Cringeing every time I hear it.
Pika Pika Pikachu
Is you like to watch pokemon
They always rap
Ships made in North Korea
Huh, I thought she was English.
Yeah, right up until aloominum, whatever that is ;)
The presenter is great, but please people: Slow. Down. No, really!
It's a video, you can rewatch, pause and even alter the playback speed..
First
Do I get a cookie?
NO.
Lol it said I was first too, but I just posted a comment about shipping XD
@@jakeferguson21 that is so funny but well done for the one that was first! Haha save the earth! God bless you guys!
@@totallynotafanficreader7850 we all liars according to Google right? Haha
To much blush on your cheeks wipe it off
Why oh why have a British English speaker saying "aluminum"? It's so clunky and weird. Why not have her put on a phony American accent, or hire a US citizen if you want them to speak in US English?
Or just acknowledge that it is minor, unrelated detail which makes a mockery of the work and effort that was put into the video.
@Paul O'Reilly I think you might be missing Ash's point. She's asking why they are forcing a BE speaker to use AE terminology.
Andy M I suppose she is an engineer but she should still abide by the convention, The International Union of Pure and Applied Chemistry (IUPAC) officially standardised on aluminium in 1990. At least it doesn’t really cause any confusion, not like metre/meter.
Speak slower and don't just read the script blindly. English is not my native language so speaking like this will make it hard for me to understand. And thank you for this video :)
And truth is they destroying the earth. No wonder it's crying out to the Lord. With blood. We are made up of earth. Well done girl ! You are very pretty BTW. 💙
I don't remember the video saying that ships were destroying the earth.. Hmm, maybe I need to watch it more closely.
Garbage floating in water does far more destruction than a boat. And if you actually want to talk about killing the planet, you need to look at where your electricity comes from.