What it Takes to Manufacture Million $ Propellers Moving World’s Largest Ships

Welcome back to the FLUCTUS channel for a discussion about how giant ship propellers are manufactured, cleaned, and protected from the ocean’s elements.
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[@sypoth]

For those wondering, the golden looking metal is called Aluminium Bronze, it's currently the go to choice for its toughness, corrosion resistance, and ability to prevent much of the buildup that other materials can experience.

[@dianapennepacker6854]

Has to protect against cavitation well I am sure too. Not sure what makes something good for that but do know it is important and why people are investing in those new propellers. Uh toroidal I believe they are called. (Also more efficient!)

[@theplatypen1959]

And yet the finishing lure industry still uses brass, which will tarnish from the oil in your hand, or you can pay way more for gold plated

[@curtiskelly1242]

That earns a like

[@cepopeye]

Yeasty buildup?!

[@lylestavast7652]

@@dianapennepacker6854 prop design is also specific to the actual use case, so something like toroidal may or may not add value - ducting alone can reduce some issues of exposed tip designs, and some of the directional pods as shown are ducted. BUT, I would love to see a cargo ship study using toroidal optimized for speed and ocean use just the same.

[@alumni2a692]

😂 I was interested in seeing how propellers are designed, build and installed with all the science and technology behind it … And I find myself watching 10mins of underwater cleaning 😂😂😂

[@idonjohnson6999]

Very little on the actual manufacturing process. I expected a “how it’s made” type documentary.

[@kingk2405]

I always found propellers really beautiful things . They have a sort of perfect shape .

[@rickyanthony]

You'll love flowers

[@u_think_u_OP]

​​@@rickyanthonyyou can go near flower; but trying to do so near propeller and you are dead 💀

[@indridcold8433]

They are becoming even more beautiful with recent developments.

[@kingk2405]

@@indridcold8433 Saw the one with each blade forming a sort of half mobius knot and they are supposed to be 20% more performant and 20% most fuel efficient ...problem is that their engineering has to be so precise they cannot be made in a foundry , only CNC machinery can make them so cost is stratospheric and not commercially viable yet .

[@mikebrase5161]

​@@kingk2405I would also add that propellers hot logs, Rocks and whales and get damaged or bent and can be repaired. Those new ones cannot. You bend it it's toast.

[@tinman5322]

Beautiful footage, too bad it doesn't always coincide with the dialogue. I'd think blades on variable pitch props could rotate 360 degrees (they can't) if I hadn't worked on them.

[@SeattleBoatdog]

Exactly - Retired trainer of ships officers here - My multiple te technical autisms are quite badly triggered!! 😂😂

[@paulogabrielferreiralage3632]

Worked for LIPS in Brazil and that time we did a giant one made by CuNiAl!!! Great Time!!!! 55Tons ready to use!!! That time the polish and the machine the blades was by hand. Holes defines the thickness and machining til the holes vanishes. Was incredible, even a 55Ton propeller!!!! 70's

[@moranplano]

What is that metal formula...is it Copper/Nickel/Aluminum? Why that particular alloy?

[@chrisharlan3671]

Mcc

[@chrisharlan3671]

Mmmmktg ml

[@chrisharlan3671]

Of m

[@chrisharlan3671]

Kkffffkf

[@constantinosschinas4503]

You completely skipped the most crucial part of propeller manufacturing: Balancing and Surfacing, which is done by super rare experts and can significantly change a propeller's efficiency.

[@tjeerdveenhoven]

yes a very incoherent clip with strange manufacturing highlights and missing some essential ones.

[@andybreglia9431]

@constantinous shinas: Efficiency my fundament. As a kid, we did model airplanes with .049 CID engines that ran on what looked like lighter fluid mixed with oil, much like chain saw engines running premix. If the propellers weren't balanced, the planes would be shaken apart and "efficiency" would be a moot point. If something as big as these propellers were out of balance, it would tear up the prop shaft bearings in a hurry and efficiency would be an afterthought. The model airplane props would do 30,000 RPM. I have no idea how fast these giant ship propellers turn, but even at 200 RPM, the stern of the ship would shake violently if the sumbitch was out of balance. I imagine that polishing would make a smoother surface for passing through water and make it harder for barnacles to remain stuck on.

[@bwmcelya]

While working at Pier 71 in Seattle, I watched a giant bronze ship propeller come to life. The whole process took three months. Pour day day was quite exciting. That’s a lot of molten metal. It took weeks to cool.

[@mattsanchez4893]

What's intersting to me is how even the largest propellers is dwarfed by the shipt they are on, yet they can still move the ship with ease.

[@rael5469]

That's one of the most fascinating things I've ever seen on video. A ship's propeller in motion under the water. And in such crystal clear water too.

[@daytona1073]

New phobia unlocked... Fear of a rotating ship's propeller... You couldn't pay me enough to be near that thing... The little one is bad, but the BIG one?? Nope... Of course it would be stopped, but if/when it starts... Excuse me while I put on my brown pants... How far does the push/pull of the water reach? I'll make sure to stay ten times that far away... Better yet... I'll say on the dock...

[@avgjoe-cz7cb]

@@daytona1073 If you are a good swimmer and know what a lock-out/tag-out is, you would settle for the usual 100+ dollar an hour divers get. (I do understand tight spaces though)

[@SteveT3D]

@@daytona1073 You have achieved *Submechanophobia.* Congrats.

[@yourface3154]

@@avgjoe-cz7cb Give me someone to watch my back for sharks and I'm 100% in.

[@AbcAbc-ox6pg]

@@daytona1073 Why fear of a propeller?

[@Ranar14]

"Curing" is what happens when you have a chemical reaction like 2 part epoxy. Metal casting would be "cooling" ;)

[@imranahmed6445]

I always wondered how the propellers were made. And finally I have found the right video regarding it.

[@Fluffy-42668]

Are there any videos on how they used to make big propellers before computers and multi axis machines?

[@jeffpotipco736]

My old boss worked in a foundry in Serbia. One of the things they made were ship propellers. They were sand castings. It was a one shot deal. If you screwed it up, you had to start all over again.

[@dohmies77]

How often would screw-ups happen while casting

[@jeffpotipco736]

@@dohmies77 once a year, he said

[@reginaldomartins4155]

Um trabalho e tanto num dos maiores transportes do mundo .

[@bewhitey]

I thought we would see some super huge CNC's milling the props! Basically skipped that part. Most large ships use electric motors to power the propellers like in those azimuth thrusters. Kind of strange they didn't talk about that at all...otherwise very interesting video.

[@greeceuranusputin]

Lots of proprietary info protected from view.

[@winstonpoplin]

Yeah i thought that looked like a huge electric motor but the dude never mentioned it.

[@peterdarr383]

YOU CAN'T HANDLE THE TRUTH !!

[@shakmusa4723]

@@peterdarr383 sHAk

[@shakmusa4723]

@@peterdarr383 sHAk

[@harryschaefer8563]

Thanks for this fascinating overview of ship propulsion systems. How is power delivered to propellers in thruster pods?

[@stevesmith6236]

Think personal watercraft, AKA "Jet Ski"?

[@CanonFirefly]

They are usually electric. Essentially, the engine onboard the ship powers a large generator which is used to power the thrusters, along with all the other electrical systems onboard.

[@tomasinacovell4293]

This is so stupidly nontechnical it doesn't even frame the content within it correctly and uses hackney phrases like "liquid metal" rather than "molten metal", it just goes on and on with that rubbish, they don't even point out the fly-cutting etc.

[@skippyguy3]

​@@CanonFirefly no, most large cargo ships are direct shaft drive...

[@CanonFirefly]

@@skippyguy3 I meant most thruster pods not most cargo ships

[@simonjackson7269]

The propeller, designed by Brunel, on the SS Great Britain, was only 5% less efficient than these.....

[@mackdell1581]

Precision IS The KEY........

[@MAGGOT_VOMIT]

@ 7:55 Sorry but a fouled prop will increase a ship's energy loss, not "reduce".

[@usaturnuranus]

Came here to see if anyone else had noticed this. I mean, if a gunked-up prop will REDUCE energy losses then why bother cleaning it? Lol.

[@anthonymicola9837]

Sure looked like they were putting together a large electric motor at the beginning of the video. Maybe people should pay attention instead immediately trying to find fault

[@user-sj8bv6uu1n]

You are true artists from the casting to the finishing. Cheers to all who make it happen.

[@andoletube]

Not really. Art prioritises form over function. This is engineering, which prioritises function over form. Any aesthetical reward you derive from it is purely coincidental.

[@travistucker7317]

@@andoletube man you poo pooed on him

[@frankwolstencroft8731]

@@andoletube Yo am a philistine :-)

[@andoletube]

@@frankwolstencroft8731 If by philistine you mean "correct", then yes, I am. Thank-you.

[@andoletube]

@@travistucker7317 Had to be done. "True artists"...Please... Hyperbole, especially incorrect hyperbole, shouldn't go unpunished...

[@sbkenn1]

Printed bronze propellors have been made, albeit with a little machining afterwards. There are several errors in the narration.

[@Bultish]

Propellers work by creating a low pressure zone one side, pushing the ship forward. Just like a propeller on an air plane and also the same principle of the wing of an air plane.

[@jakesmith6337]

Faster moving air is over a wing create lift by lowering the pressure, propellers propel by creating thrust, not the same thing.

[@Bultish]

@@jakesmith6337 And thrust is created how? Oh, by creating a low pressure differential in front of the propeller...

[@Bultish]

@@jakesmith6337 same principal different name due to directionality 😄

[@danmartens8855]

It must be fun to drive the underwater hull Zamboni!

[@coriscotupi]

01:02 - _"When revered, he propeller pulls water toward it, allowing shops to move backward as well"._ Except the ship moving backward in this scene isn't being moved by its propeller, which can as be seen, isn't turning. But that's nitpicking. Good video.

[@Lozzie74]

Speaking of nitpicking, would you like to have another go at spelling “reversed”?

[@coriscotupi]

@@Lozzie74You may insert an _"s"_ where applicable.

[@trinomial-nomenclature]

​@@Lozzie74 Also "he" and "shops" lol.

[@SnoopyDoofie]

Engineer's solution: Complex engines with drive shafts My solution: Just one big rubber band that unwinds for the entire journey.

[@easygoing2479]

12:43 Reminds me of when I built an old 426 Hemi.

[@dubstronaut]

Scary stuff being down next to those blades. A simple miscommunication can easily cause a life to be lost if those things start up while anyone is still underwater and close to them!

[@thebogsofmordor7356]

That's what Lock out-Tag out is for.

[@2615Prasad]

And safety work permits

[@daveespraggins411]

@@thebogsofmordor7356; ;b

[@peterdarr383]

"Don't go until I say all clear" "You said ALL CLEAR?" "no - i DIDN'T say "ALL CLEAR" . . . etc

[@erickyee4198]

The big ship has very different systems of engine starting. And Mega size of diesel engine takes 6 hours at least to be warmed up before starting. Of course the order of engine starting is on the captain when 'stand by' for navigation after all ship hands are ready. It is totally different from simple cars or small boats.

[@joeycad]

Will toroidal propellers be made/used in the future?

[@Swedish_men]

I liked the vid first yay🤩🤩🇸🇪👑

[@joaoalbertodosanjosgomes1536]

👍

[@rogerdudra178]

Greetings from the BIG SKY. Big brass propellers!

[@BasementEngineer]

Those ship propellers are not brass, which is an alloy of copper and zinc. Modern water propellers are made of aluminum bronze with a little nickel added. This is an exceedingly tough and wear resistant metal.

[@JWCreations]

Totally skipped the major part of balancing these before they're mounted.

[@finscreenname]

Not a whole lot on "What it Takes to Manufacture Million $ Propellers..."

[@sinatra7407]

Looks like it's made of gold, must be for the Saudi Royal family.

[@JoeCortazzo]

Am I the only one who has a phobia of giant ship propellers?? Especially underwater

[@lesheinen6116]

There are at least two of us. Those things give me the shits.

[@luutiendung6680]

Video này rất thú vị và hấp dẫn. Ý tưởng đề cập đến rất sáng tạo và giải thích rõ ràng. Nội dung được thể hiện rất tốt và gây ấn tượng mạnh. Tôi rất thích xem video này. 🌻🌹🐓

[@Duncan_1971]

Great video, the only minor criticism is the meaningless sporadic 'musak'. It doesn't add anything and cheapens the production. I'm infuriated by it.

[@parks-music-cafe]

Thank you for sharing the useful video. I watched and get much information. Thank you. Have a nice day!!

[@realtalk5626]

elon is working on the Tesla Boat right now

[@frankwolstencroft8731]

The Tesla boat will be self steering, so that the human crew can be dispensed with.

[@MrOjeeeee]

What an unstructured video. It just jumps back and forth between things

[@whateg01]

If not for the incorrect descriptions of several things, this might have been an enjoyable video.

[@donaldasayers]

3:38 'rotated on their horizontal axis.' Lol no. ALL propellers rotate on a horizontal axis, thruster rotate additionally on a vertical axis.

[@herbertmilley911]

Great videos, but you talk a lot of blather; for example 'tolerance to the smallest millimeter'. Clean up your blather, and it will make the videos far better.

[@user-of1cl1vw7g]

프로펠러 안에는 철로 만들고, 외부는 0.5cm 두께로 황동으로 만들면 가격이 싸 질건데.. 황동 때문에 따개비도 막을수 있고...

[@Superstructures]

the most expensive fans ever

[@v.ar1234]

Any idea what the cost of the finished and fully assembled propeller could be ?

[@incogspectator3042]

$800,000

[@joeyjamison5772]

If you have to ask, you can't afford it!

[@ivicadumancic1374]

Ovisi o velićini propelera kao i broju pera 4-6,dali je kut pera promjeniv,dali su pera zamjenjiva ili je cijeli propeler u jednom komadu,

[@DavidJohnson-rd5wy]

I'd pop a guess at 200k for material ,and 500 k for the machine work.. Roughly 700k.

[@frankwolstencroft8731]

I would guess at $250,000

[@stevesmith6236]

Very interesting! Good job.

[@johnmurray3888]

What is needed is the application of advanced robotics to heat and forge titanium into a large elaborate shape while it is blanketed with inert gases. Imagine a giant Sharrow Propeller made of forged titanium. It would revolutionize the shipping industry.

[@fredcarr3550]

At what cost? and how long would be the payback?

[@frankwolstencroft8731]

The problem with Titanium is that it rapidly work hardens during plastic deformation, and therefore must be annealed in a vacuum furnace, before further deformation can occur without fracture.

[@BrunoKarett]

The bigger, the more fascinating

[@fishwear391]

very interesting content

[@joaoalbertodosanjosgomes1536]

Yes.

[@coolmxx]

This Pitch Control Mechanism is required in all ship I think 👍

[@eugenevandekamp5275]

"a fouled propeller reduces energy loss"??? its the opposite; no point in further listening.

[@onradioactivewaves]

It will be interesting to see this new more efficent propeller design make it's was into tge largest ships.

[@damongraham1398]

Has anyone done 3D models about Toroidal propellers for full size ships?

[@kayakMike1000]

Might be complicated when considering variable pitched props.

[@damongraham1398]

@@kayakMike1000 what percentage of props are variable pitch? If it is less then 50% taking the time to find out if toroidal props are better then fixed props may be worthwhile. To be as complicated as possible could variable pitch props be toroidal shaped also?

[@juana1483]

Toridol is for pain

[@dougankrum3328]

In my very recent issue of 'Foundry', received a few days ago...record non-ferrous casting..112 TONS of brass propellor...

[@micahhurst8986]

Wow! That is amazing. As a machinist I really enjoy learning about other industry.

[@loginavoidence12]

if that were in los Angeles guaranteed some guy off his face on glass would find some way to bring it to the recycle yard. they actually encourage that stuff here.

[@smacksman1]

They need to start the video with 'Are you sitting comfortably children? Then I'll begin'

[@holstertactinight]

Bonjour Génial j'ai fait du taillage de pignons de couronnes pignons arbre mais pas de cette taille là Impressionnant Merci pour cette vidéo Un français k

[@whitetiana3022]

i would be way too paranoid to dive anywhere near one of those props.

[@dakotasowyers5729]

That's pretty cool stuff to know that I had no idea about. Learn something new everyday!

[@ryanjohnson3615]

I wonder if someone could operate a service that used a lock system to give a ship a quick float in hydrochloric acid or maybe an electrolytic procedure to knock off crud then re-plate with silver or something else anti-microbic... Interesting video!

[@KC-bu8qq]

Dry docking and then filling it up with acid?

[@ryanjohnson3615]

@@KC-bu8qq Maybe some kind off double ended lock that has hydraulically actuated "hull profile following" gates with negative pressure on the acid volume to prevent acid leakage... could be a matter of a couple hours service like a drive thru car wash instead of weeks in dry dock... Dunno, just brainstorming...

[@KC-bu8qq]

@@ryanjohnson3615 It’s an interesting concept, but i assume there are easier ways to clean in dry dock. You could hose it with the same acid

[@ryanjohnson3615]

@@KC-bu8qq Drydock is a major operation though right? I really don't know living in Montana.. But I've used electrolytic processes to knock crud off of engine parts and it's pretty amazing. it just sheds the grime and rust off. Would definitely need to be submerged for that (and probably in an acidic solution anyway to re-plate) but also the crazy amount of electricity flowing through the hull might cause other issues... I wonder if alternatively they could make a lock that functioned like an ultrasonic jewelry cleaner but on a huge scale...

[@J.Knox46]

Technology is crazy.. they used to have divers clean growth off the hull of a ship between dry docking periods. Now they have robots that clean the hull like a pool vacuum.. magnets hold it to the hull.. dry docking is expensive af.. seems overkill to spend that amount of money to just clean.

[@964cuplove]

It surprises me that modern propellers aren’t ducted and I wonder if the looped propellors will ever go mainstream Also as far as I know cooling down of a cast metal isn’t called curing

[@dougankrum3328]

Yeah..after casting...it's 'cooling'...curing is a different process.

[@SuperPhexx]

Surprisingly they do 'cure' long after having cooled down. The molecular structure changes over weeks and months in a process referred to as aging.

[@budrome4247]

Yes, looped props are much better. And way way way more expensive.

[@klebbermendhes4544]

Coloquem opção de legenda em português 🇧🇷👍🏾

[@warjacare]

Aprenda inglês.

[@Lozzie74]

Ta bom!

[@ChandrasegaranNarasimhan]

Instead of working with one giant propeller, work with 4 small propellers, Two in front and two in the back. The water entering the propeller has to be meshed out, so that marine mammals are not harmed. Hull can have double chambered feature without any protrusion to the side of the ship. So if outer hull is breached, ship can still function. Water can be filled into the hull to lower ships height if needed. It can also be used to simulate drowning or for war games when the outer hull is breached. Cargo ships can be made broader for more stability and passenger ships can remain tall because we need more ocean view.

[@beyenhagos1490]

Thanks to technology very interesting program 👍

[@copperlemon1]

Sure hope there are some serious LOTO procedures for the guys doing the defouling.

[@plane_guy6051]

Cleaning propellers under water looks like a very difficult and crappy job.

[@Boeinguy]

many narrations are not of the scene presented? One segment speaks of "the pods can rotate 360 degrees" while showing a conventional shaft with an adjustable pitch propellor, its not an azipod.

[@philw2032]

Craftypanda version of how its made

[@avotini4400]

Hallo everytwo!

[@CameronSalazar2113]

Adhd is its best and purest form, my bane of the world one day i'll work to learn how to program and the next ill be a woodworker, next i'll try graphic design. This has and will always be a thing that we do and sadly it's one of my most favorite parts of my person getting excited for something new and trying it is so much fun, until it is not...

[@pyramidsinegypt]

8:00 'just as a fouled propellor can reduce energy loss'... this should be 'increase energy loss, right?

[@JCO2002]

Good stuff. If I had a boat, I'd clean it every day or two.

[@billy4072]

🫡👍🫡

[@fredcarr3550]

Yeah right! just like your auto😄.

[@DavidJohnson-rd5wy]

Not this big a ship.....

[@TheGreazyGrind]

That’s not 3D printing that was a cnc machine

[@mycomment4896]

Вот бы такие станочки в мастерскую, да мастерскую под эти станочки...

[@ahmetaltn9750]

Tesekkurler

[@ugenegareth9339]

I answered and said, "If I have found favor in thy sight, O Lord, show this also to thy servant: whether after death, as soon as every one of us yields up his soul, we shall be kept in rest until those times come when thou wilt renew the creation, or whether we shall be tormented at once?" 76 He answered me and said, "I will show you that also, but do not be associated with those who have shown scorn, nor number yourself among those who are tormented. 77 For you have a treasure of works laid up with the Most High; but it will not be shown to you until the last times. 78 Now, concerning death, the teaching is: When the decisive decree has gone forth from the Most High that a man shall die, as the spirit leaves the body to return again to him who gave it, first of all it adores the glory of the Most High. 79 And if it is one of those who have shown scorn and have not kept the way of the Most High, and who have despised his law, and who have hated those who fear the Most High -- 80 such spirits shall not enter into habitations, but shall immediately wander about in torments, ever grieving and sad, in seven ways. 81 The first way, because they have scorned the law of the Most High. 82 The second way, because they cannot now make a good repentance that they may live. 83 The third way, they shall see the reward laid up for those who have trusted the covenants of the Most High. 84 The fourth way, they shall consider the torment laid up for themselves in the last days. 85 The fifth way, they shall see how the habitations of the others are guarded by angels in profound quiet. 86 The sixth way, they shall see how some of them will pass over into torments. 87 The seventh way, which is worse than all the ways that have been mentioned, because they shall utterly waste away in confusion and be consumed with shame, and shall wither with fear at seeing the glory of the Most High before whom they sinned while they were alive, and before whom they are to be judged in the last times. 88 "Now this is the order of those who have kept the ways of the Most High, when they shall be separated from their mortal body. 89 During the time that they lived in it, they laboriously served the Most High, and withstood danger every hour, that they might keep the law of the Lawgiver perfectly. 90 Therefore this is the teaching concerning them: 91 First of all, they shall see with great joy the glory of him who receives them, for they shall have rest in seven orders. 92 The first order, because they have striven with great effort to overcome the evil thought which was formed with them, that it might not lead them astray from life into death. 93 The second order, because they see the perplexity in which the souls of the unrighteous wander, and the punishment that awaits them. 94 The third order, they see the witness which he who formed them bears concerning them, that while they were alive they kept the law which was given them in trust. 95 The fourth order, they understand the rest which they now enjoy, being gathered into their chambers and guarded by angels in profound quiet, and the glory which awaits them in the last days. 96 The fifth order, they rejoice that they have now escaped what is corruptible, and shall inherit what is to come; and besides they see the straits and toil from which they have been delivered, and the spacious liberty which they are to receive and enjoy in immortality. 97 The sixth order, when it is shown to them how their face is to shine like the sun, and how they are to be made like the light of the stars, being incorruptible from then on. 98 The seventh order, which is greater than all that have been mentioned, because they shall rejoice with boldness, and shall be confident without confusion, and shall be glad without fear, for they hasten to behold the face of him whom they served in life and from whom they are to receive their reward when glorified. 99 This is the order of the souls of the righteous, as henceforth is announced; and the aforesaid are the ways of torment which those who would not give heed shall suffer hereafter." 100 I answered and said, "Will time therefore be given to the souls, after they have been separated from the bodies, to see what you have described to me?" 101 He said to me, "They shall have freedom for seven days, so that during these seven days they may see the things of which you have been told, and afterwards they shall be gathered in their habitations." 102 I answered and said, "If I have found favor in thy sight, show further to me, thy servant, whether on the day of judgment the righteous will be able to intercede for the unrighteous or to entreat the Most High for them, 103 fathers for sons or sons for parents, brothers for brothers, relatives for their kinsmen, or friends for those who are most dear." 104 He answered me and said, "Since you have found favor in my sight, I will show you this also. The day of judgment is decisive and displays to all the seal of truth. Just as now a father does not send his son, or a son his father, or a master his servant, or a friend his dearest friend, to be ill or sleep or eat or be healed in his stead, 105 so no one shall ever pray for another on that day, neither shall any one lay a burden on another; for then every one shall bear his own righteousness and unrighteousness." 2 Esdras 7:75 ///////////////////////////////////,,,,,,,,,,,,,,,

[@johncole3010]

I walked 😮under aircraft carrier propellers in dry dock and they were coated with zinc foam. It made me wonder how they were still hydrodynamic

[@clintbillton2161]

Another cool invention from the good old Sweden :)

[@user-bp5jf7pv5r]

日本語字幕があると思いました！😂 素晴らしい動画ですね！

[@kosmotto]

Why are they not incorporating the new spiral type prop

[@stevelowndes5803]

Some interesting footage, but amateur narrative.

[@williamlopez8676]

propellers do not work by "pushing water" behind the ship. They are foils like a wing, or aircraft propeller. In cross section they are shaped the same. the curved surface like that of a wing creates a lower pressure on that surface, which in turn pulls the propeller along with whatever it is attached to.

[@cosmiccolonel]

They do not have an airfoil cross section, thrust comes from the angle of attack…….

[@gagarin777]

Video was made by AI. The information presented is on a level of 8-yearolds.

[@andre1214g]

Very impressive, thank you for sharing.

[@kojiwaragai]

Good job‼

[@ChickenDeranged]

4:29 looks a lot like the hull of SS Enterprise!!!!

[@stinkstank5177]

I’m guessing very few woman in this field, just an observation!

[@user-pq7lu7hs7v]

스쿠러 방법은 효율이 낮아 또 다른 방법은 없을 까 더 좋은 방법이 있다 물을 밀어 내는 방법 이고 후면 모든 면 에서 가능 하다

[@marcusm8009]

What about the Marine animals that get blended up?

[@roco8420]

What about the small animals you drive above that get smashed?

[@TheKeithvidz]

This knowledge was tasty for the mind once again.

[@furstenfeldbruck]

I love this 2x speed option

[@OleJeffy]

bet the guys making the million dollar blades make 20 an hour.

[@joeking1019]

Well I guess that energy to manufacture these components will not be derived from windmills and solar panels

[@user-no9ew9gu9z]

My friend an i worked at jc lips, in drunen, around 2001. We worked as aufworkers ( finishers). Working on bow thruster blades to staet with, then on to the 6 blade props ( 28 ft in diameter), and four blade props ( 35 ft in diameter) Weight of the props was in excess of 90 tons. Good times. When we finished there, went to a shipysrd called nehuis van der berg, and helped put blades, on a variable pitch prop, and the blades were from......you guessed it, j c lips.

[@Prestologs]

Good video for the people that now nothing about ships and propellers. Many inaccuracies . A professional mariner is wincing.👎

[@keything8487]

cool video's.......at the 12:15 it looks like somebody forgot a wrench in the block, while hoisting it....

[@US_Defense_Id]

Amazing 👍

[@brianmorrell435]

Interesting stuff thanks