As a Naval Architect, I really wish I had access to these videos when I started my degree. Such a practical demonstration of the theoretical concepts.
@ReflectedMiles
2 жыл бұрын
....plus you would have understood how critical it is for large ships to be able to get up on plane if they're going to be any good, especially with efficiency plus speed together. If 590-ton craft can leave the ground supported by nothing more than a gas, what's the hold up? How can we expect planing not to be standard on large vessels? 😊
@krombopulosmichael6162
2 жыл бұрын
@@ReflectedMiles sounds like you are suggesting hydrofoils. They are not efficient for larger ships. Please note my Naval Architectural degree is focused on plastic bathtub toys.
@EricGoesToShopClass
2 жыл бұрын
As a docking tug captain, this is cool to see in exactly the opposite way 😂 Practical demonstration is all we get. Learning pressure zones on different hull forms is a very stressful experience.
@RobBCactive
2 жыл бұрын
@@krombopulosmichael6162 No in the video plane speed was beyond the hump speed where the wave peak is at the bow and the trough at the stern, so the engines push uphill in addition to water resistance.
@krombopulosmichael6162
2 жыл бұрын
@@RobBCactive most ships are not designed for plane speed though, according to the video. It does mention bulbous bows, which are becoming more common.
@hawkeyeted
2 жыл бұрын
I spent 23 years on aircraft carriers. Being retired, I now work around a lot of Airforce dudes. None of them believe me when I tell them carriers are the fastest ships in the fleet.
@jpaugh64
2 жыл бұрын
Yeah, that's not how it works in the video games, either! 😂
@timjohnun4297
2 жыл бұрын
People see that big wide flight deck and ignore the narrow beam at the water line. Probably understandable I guess
@jpaugh64
2 жыл бұрын
@@timjohnun4297 😂
@jpaugh64
2 жыл бұрын
@@hawkeyeted Why are you angry or surprised that video games are wrong?
@hawkeyeted
2 жыл бұрын
@@jpaugh64 Why are you here chirping about stuff you know nothing about?
@mastasolo
2 жыл бұрын
Those jet engines on the ship are 100% what I would do If Kerbal had sea fairing vessels.
@hphp31416
2 жыл бұрын
Trent turbines are used to power both aircrafts and ships
@Digi20
2 жыл бұрын
in fact there are many ship gas turbines that share most of their parts with airliner jet engines.
@mele2904
2 жыл бұрын
Some US Navy vessels have turbine engines. Envy? LOL
@CynicalOldDwarf
2 жыл бұрын
Have a look at Russia's Ekranoplan flying boats
@anonobot3333
2 жыл бұрын
That’s what the fishing boat needs 😆
@davidsellon4580
2 жыл бұрын
Thanks for the explanation. I've often wondered the same. Years ago, I was on a 42' private vessel crossing the Panama Canal. The Canal obviously has too much traffic to let a puny motoryacht take up an entire lock, so the Harbormaster put us in with a cargo vessel -- large, but sufficiently short to accomodate us both -- for each leg of the trip. On the way up, the big ship entered first, and we behind her. When we reached the lake elevation and that ship fired up her engines, her prop wash was so intense that the only thing keeping us from getting bashed into the sides of the lock were the six lines the Canal staff gave us (delivered by the famous "monkey fist") that held us tightly in the center. Still, all open beverages were immediately spilled. When she got underway and we followed, I was amazed at how quickly she put distance between the two vessels. In no time at all, we lost sight of her. Of course she made it across Gatun Lake in a fraction of the time it took us. The Canal staff knew this would happen, so they had previously scheduled us for a departure with a different vessel. This time, her length wasn't an issue, as they put us in ahead of her, and her bow literally covered the space we occupied. You don't truly get a sense of the scale of these beasts until you have looked straight up from the deck of your boat and seen nothing but metal above your head.
@andresmartinezramos7513
2 жыл бұрын
The worlds most expensive parasol
@bnease007
2 жыл бұрын
It’s hard to imagine taking a 42-foot vessel through the PC. It definitely would’ve been a fascinating and memorable adventure.
@davidsellon4580
2 жыл бұрын
@@bnease007, it sure was!
@robertu
2 жыл бұрын
@@bnease007 Taking any vessel through the first time is memorable and fascinating.
@AllAmericanGuyExpert
2 жыл бұрын
I have a ship's bell from the Panama Canal. Weighs about 400 pounds.
@jaquigreenlees
2 жыл бұрын
You could easily expand this video with the hull shape aspect alone, ldl hulls are faster and lower fuel costs. a good example, an 85' loa motor yacht with a draft of 4 feet designed for displacement cruising. Top speed is 18 knots, cruising speed is 15 knots. 15 knots speed gives her 1,500 nm range on 1000 US gallons of diesel, 18 knots gets you 500 nm from the same quantity of fuel. These same factors are in play with the big cargo ships, yet most people can relate to being told if they slow down by 5 miles an hour they will travel 1000 miles further in their pleasure boat over it's cheaper to ship a 6 week trip than a 1 month trip for your overseas delivery.. *ldl = low displacement length.
@Azettler1
2 жыл бұрын
500 nano-metres! Wow that's inefficient!
@jaquigreenlees
2 жыл бұрын
@@Azettler1 nautical miles
@Azettler1
2 жыл бұрын
@@jaquigreenlees I knew what the acronym was for and was just bugging. I find it funny that we have two measures of distance that have the same unit label :)
@ThomasSteffien
2 жыл бұрын
it maybe of interest: the bulbous bow works only at a limited range of speeds, because its wave has to interfere as designed with the normal bow-wave. Cargo ship hulls (including the bow-shape) are designed for a resonable range of cruising speed, to be fuel efficient. Intrestingly you can guess a ships speed by looking at its generated wave lenght at the hull. you only need to know how long the ship is, judge the length of the wave and use the formula depicted in the video to calculate the speed of the ship (through the water) ...
@dirkkarmel5209
2 жыл бұрын
Your explantion/guess, does not include water conditions. All vessels: would be much better with a nose bulb ! -- Better for control of spin & steering; -- Keeping hull at a reasonable angle compared to the water surface. -- Better dispersing of the bow's wave. ****** >> A Hydro-plane: -- can achieve higher speeds; -- has less danger of flipping over. ( compares to many automobiles that save gas, with 500lb -- 200 kg of cement inside the rear trunk ! )
@lochlanm8684
2 жыл бұрын
@@dirkkarmel5209 how would adding weight in your trunk improve efficiency??
@rydenkaye9735
2 жыл бұрын
Dumbest comment I’ve ever read. Try strapping a bulb to any type of Planing hull and let me know how it goes
@happyambush1
2 жыл бұрын
Wouldn't it be way easier to just guess the speed than to guess the wave length AND guess the length of the hull to calculate the speed?
@Bruce-1956
2 жыл бұрын
I sailed on VLCCs in the '70s and their top speed was 15 knots. During the oil crisis we never sailed faster than 8 knots.
@LauRoot892
2 жыл бұрын
Bruce 🧐
@awsalminen
2 жыл бұрын
Wow. Great video. I’m completely land locked but totally in love with the ocean. Just amazing information. Mind is blown right now
@LauRoot892
2 жыл бұрын
Yep
@Lozzie74
2 жыл бұрын
Beautifully explained. I’ve heard the waterline length rule touted for years and only recently learned it was due to a longer wavelength of bow and stern waves. You closed the loop for me, easily explaining that the wavelength was itself proportional to speed. Thank you!
@pwnmeisterage
2 жыл бұрын
Assuming the ship is travelling against and into waves, of course. More often - for speed and efficiency - it'll travel with the waves whenever possible. Sometimes it'll have to travel across the waves, winds and currents don't always end at your planned destination. Sometimes the waters will be calm. Making the hull bulb counterproductive, if anything.
@ethribin4188
2 жыл бұрын
Overcoming the hump speed is mechanically the same as breaking the sound barrier. You wffectivly turn a wave into a straight line, saving tons of energy. But it needs tons of energy to overcome the hump/barrier first. And even then it needs more energy then any speed that doesnt approach thr hump/barrier.
@mele2904
2 жыл бұрын
There are other ways to defeat the wave effects. Tuning shapes of leading and trailing edges to better suit lamellar flows back into the common plane on the trailing edge is the major factor. Shorter hulls can be made efficient at higher speeds but compromises are often made to achieve other desirable effects. This video however is a good beginner primer for this niche of fluid dynamics.
@jpaugh64
2 жыл бұрын
I thought as much, and thought of the same analogy. "Needs more energy than any speed that doesn't approach the hump barrier." Every time you accelerate from zero, you're approaching the hump barrier. I know you're talking about it as a limit from Calculus, but how close to the hump barrier does it have to be for that factoid to lose veracity? 70%? 40%? Actually, Real Engineering shows a graph of drag vs mach number, and it clearly shows that mach 1 is a peak, and by mach 6, the drag is significantly lower. He was taking about rockets (which are designed to go faster than MACH 1), so I'm not sure if his graph was generally applicable to hurled objects or not. He was discussing the new startup with rockets whose "first stage" is a centrifugal slingshot. I can't remember the video title.
@hoodoo2001
2 жыл бұрын
Back around 1890 when they were building the first USS Texas battleship an argument ensued with the designer, the Bureau of Construction, and the actual builder. There were worries that the weight calculations of the ship had been in error and the builder suggested that the ship be made ten feet longer but the keel had already been laid (but could have been modified at extra cost). The builder said that the ship would have the added benefit of being faster as a result. However, the argument grew so heated about modifying the ship at this stage that the Bureau of Construction threatened to cancel the vessel due to the added cost...however the builder recalculated the weights and stated that while the lengthening could have added speed, the weights were not an issue so the project continued at the design and the Texas, although having an extremely long build time nonetheless was delivered on it's original budget to it's original design. As it turned out the USS Texas might have used an extra knot or two during the Battle of Santiago in 1898 but the Battle turned out well in any event for the United States.
@CMDRSweeper
2 жыл бұрын
Excellent video, I heard the term "Hull speed" but nobody had a good explanation as you put it here as to what happens. Keep up the good videos and knowledge spreading you do!
@martinbraden7110
2 жыл бұрын
Why is a longer boat faster than a smaller one? Because the front is closer to it's destination.
@Lexoka
2 жыл бұрын
Very interesting, and very clear! In case you were wondering whether a longer, more detailed video on this topic would find its audience, know that you'd have at least one enthusiastic viewer.
@thereal_morxy49
2 жыл бұрын
Finally i understand why my uncle always told me it's better to go fast with the boat so it starts planing!
@el.blanco552
2 жыл бұрын
I like how you answered the question again but this time with the context of everything we're talking about so the more literal explanation makes more sense. Great way to sum it up at the end of the video.
@DaveSCameron
2 жыл бұрын
I really enjoy your work and efforts uploading these, not too technical and not too simplistic. 👍❤️🇬🇧
@OneRandomMicrowave
2 жыл бұрын
Perfect timing. I was bored so this is great
@antnate578
2 жыл бұрын
I love how these videos are extremely educational and are practically like having a real “ship” course.
@PakBallandSami
2 жыл бұрын
step one: get a big ship step two: apply for boat racing event step three: get rejected step four: say the a big ship is like a boat but bigger step five: they still reject you step six: give up
@nonna_sof5889
2 жыл бұрын
step seven: try to run it anyway step eight: run aground because the course is to shallow
@matejlieskovsky9625
2 жыл бұрын
step nine: dredge a deeper race course step ten: get smoked by a hydrofoil anyway
@Raggandrist
2 жыл бұрын
I don’t even like ships, they scare me, but i’m such a geek that i can’t help being fascinated by all the technical elements and math involved. These video’s are amazing for people with a similarly geeky disposition as my own
@jpaugh64
2 жыл бұрын
Things scare me. Mostly, my fears are real possibilities, however improbable. A wise man told me that voluntarily facing my fears was the best way to diminish them.
@ianprice6323
2 жыл бұрын
The fastest ship ship I've ever been on was the USS Carl Vincent. We were going WAY faster than the 32 knots Wikipedia says it capable of. Seriously. WAY faster than that. It was mind blowing. Aircraft Carriers can move.
@Pax_Veritas
2 жыл бұрын
All the info I needed about something I have no practical use for. Subscribed
@g.k.1669
2 жыл бұрын
I live very close to the St. Clair river and frequently watch the Great Lakes freighters over 1000 feet in length and the salties (smaller ocean ships) down to just a few hundred feet as they travel up and down the river and into the Great Lakes. For years I have wondered about the wave pattern as some ships would create a massive wave at certain speeds while others moving at the same speed would produce hardly any waves, yet the same ship would then produce a huge wake at a slightly different speed. I just assumed that it was cargo weight that accounted for this. Usually I notice 3 wake patterns as one comes from the bow, another set from mid ship and the last from the stern. This answered a lot of questions for me. Thanks for the video.
@N1ghthavvk
2 жыл бұрын
I had to laugh out loud when I saw that massive commercial cargo vessel using the engines to start "climbing"!
@Kennanjk
Жыл бұрын
I have learned much and will now calculate the optimal wake surf speed for my boat thank you.
@quillmaurer6563
2 жыл бұрын
On a related note, how much of a large ship's drag is from wave drag vs. viscous drag against the ship's hull? I always got the impression wave drag is the dominant factor. Thinking of viscous drag would be another factor in favor of larger ships, at least in terms of efficiency. More volume (mass, cargo volume, displacement) per surface area, assuming a similar shape.
@Kieselmeister
2 жыл бұрын
Friction drag increases linearly with speed, wave drag increases with the square of speed. (Hull fouling from things like barnacles involves both, as the additional surface area of the protrusions increases friction, and each additional protrusion generates it's own wave.)
@rydenkaye9735
2 жыл бұрын
Hull friction barely effects wake lol the waves generated by a individual barnacle are negligible compared to the tons of metal displacing water
@quillmaurer6563
2 жыл бұрын
@@rydenkaye9735 Hull friction doesn't generate waves, it causes drag by another mechanism. Basically viscous friction between the ship and water causes a layer of water to be dragged along with the ship, which puts energy into the water and thus out of the ship, the engine needing to overcome this. Submarines have this, but don't have wave drag because they are too far from the surface to generate surface waves (hence, per displacement, submarines are actually more efficient, though with obvious other limitations and challenges).
@HulioPalas
2 жыл бұрын
@@quillmaurer6563 i think a submarine generates waves as well, you just can't see them
@f3tsch906
2 жыл бұрын
I live in a landlocked country, but i really enjoyed this 👍
@TheKittyClink
2 жыл бұрын
I'm not in any kind of naval anything yet I watch every video over time haha. I'm a pilot and I watch ship videos 😮
@aaronchown5008
2 жыл бұрын
Well there's an answer to a question I never had, I appreciate this new knowledge.
@Fanny-Fanny
2 жыл бұрын
The big'uns generally tend to have a faster 'hump speed', in my experience.
@Electronzap
2 жыл бұрын
I'm not surprised. A jet can go literally twice as fast as one of my paper airplanes.
@j_taylor
2 жыл бұрын
If your paper airplane airline serves good food, I'd still fly with you. 👍🛫
@JasperB12
2 жыл бұрын
Keep up the great work! Love your voice! 😍
@surfstarcc1
2 жыл бұрын
I've been boating my entire life and this just blew my mind.
@cliffcampbell8827
2 жыл бұрын
Has anyone taken a closer look at ancient sailing ships specifically from around Greece, Rome...basically the Mediterranean area? I noticed that some of those ships had a bow with a 90° square to the natural water flow where a bulbous bow should be. Kind of like a stop sign of sorts, only under water and having 4 sides instead of 6. That big under water square bow seems counterproductive to me but maybe the ancients living in the bronze age knew something about fluid dynamics that are simply beyond me.
@cheveuxgraouh3821
2 жыл бұрын
It's a ram, it's not made simply to go through water, it needs to go through other ships too.
@cliffcampbell8827
2 жыл бұрын
@@cheveuxgraouh3821 Below the waterline?...and it was recessed a little behind the keel of the bow or figurehead (the ship I saw didn't have a figurehead). I think it was the Argus I was looking at but not sure.
@annasolovyeva1013
2 жыл бұрын
@@cliffcampbell8827 yes, so you make a hole in an other ship below the waterline and make it sink
@BierBart12
Жыл бұрын
This is so incredibly interesting. It's when water waves show their similarity to other kinds of quantum waveforms. Though, higher drag meaning higher hull speed is still confusing to me. All waves are disturbances in a system that transfer energy. Imagine if we could ride radiowaves, which can be MUCH longer than any water waves. It'd be like you're suddenly propelled 30 meters into the air without seeing anything, but you ready your antiparticle surfboard and ride this invisible wave until a mountain gets in your way. Or you accidentally leave the atmosphere and die.
@benjamit2002
2 жыл бұрын
great video, like saying a taller person has a longer stride than a shorter person, and thus walks faster
@ethzero
2 жыл бұрын
Fascinating. Thanks random KZitem recommend and the people that produced this excellent video!
@HannyDart
2 жыл бұрын
2:54 being an engineer from europe that one hurt.
@surellow
2 жыл бұрын
I have a similar hump speed to these ships very informative thank you ❤❤
@therraxz
Жыл бұрын
Why was this relativ boring information in this video so interesting? I watched the whole thing. Great job creator😀
@Suasagesmonkey
2 жыл бұрын
Brilliant
@Bealzbob
2 жыл бұрын
Really interesting and well described. Every day is a school day.
@BrownieTheCat_
2 жыл бұрын
not gonna lie i was expecting you to talk about how many propellers the ship has and the fact that bigger ships have more room for engine power which is how the Lusitania got so fast. but I still loved this.
@jakubznojemsky4936
2 жыл бұрын
4:50 ...you can just slap on the bulbous bow and everything we talked about no longer matters all that much. :D Just hillarious Still as a technician I can imagine the nightmare of designing right proportions for ship when you have bow, bulbous bow and tail generating the speed dependant waves and you need all of these to zero out because if you run at wrong speed it's gonna be drag
@SnowingNapalm
2 жыл бұрын
yeah but imagine adjustable bulbus bow on an aircraft super carrier you could set your wave counter interfereance remotely depending on what extreme speed you've acheived so possibly even more fuel rod effeciencies biggest problem would be trying to not cut great blue whale's 🐋🐳 in half or a pod of humpbacks we know dolphins love cruising on a wake so imagine killer whales another type of dolphin 🐬 doing the same or even great blue whale's hitching a ride 😇💜
@jakubznojemsky4936
2 жыл бұрын
@@SnowingNapalm That would be good upgrade for bow. Also dolphins and killer whales around might be nice. However after years of misery and keeping nature on the other side of fence I would be only concerned if the whale collision can damage bow and if we would have means to tow both halves to the port or processing them.
@timseguine2
2 жыл бұрын
A little counterintuitive that the Hull speed is so inefficient, since it seems like generating less wash would waste less energy. But clear after the other factors weigh in. And then slightly vindicated by the existence of bulbous bows.
@Saaco42182
2 жыл бұрын
This actually explains so much now
@PwnageProductions10
2 жыл бұрын
we don't call it hump speed, typically you're motoring, then plowing, then planning
@Newfieboi
Ай бұрын
that thumbnail is wild
@SrFrancia0
2 жыл бұрын
Heyyyyy Fred Olsen's ferry! I see those every day in my hometown in the Canaries :D
@PeteBetter
2 жыл бұрын
Modern Ocean Racing yachts are built to plane where old yachts were displacement vessels.
@shawnpa
2 жыл бұрын
I never thought of the physics of ship movement. There's lots of interesting design factors.
@LauRoot892
2 жыл бұрын
Shawn
@GlitchPG3D
2 жыл бұрын
The truth behind all this is the bigger one is usually carrying more valuable stuff and try to get there faster because its more important, the smaller one would be carrying either cary stuff you buy off of ebay, books or furniture or food, versus the bigger one carries car parts building supplies and very dangerous stuff like dynamite or gasoline or other stuff.
@kindlin
2 жыл бұрын
I wonder if part of the first principles explanation for this effect is the square-cubed law. The engine power will be designed with weight it has to push, increasing engine power with the weight (length cubed) while the drag increases with the area (length squared), so the larger ship has a relatively easier way pushing around the water. I didn't look up any numbers, tho, so this could be off base.
@crispybatman480
2 жыл бұрын
100% worth the watch, very interesting
@LMau-t9r
2 жыл бұрын
Like the video said, cargo ships are incredibly optimised for cruising speed and fuel economy, being surprisingly eco efficient (a lot of research papers), international shipping has a thin profit margin
@DemPilafian
2 жыл бұрын
Great visualization of ships and wave lengths! Just a style comment that starting off with length in *meters* and then switching to length in *feet* is distracting. Anyone on the internet nowadays knows about *meters.*
@michaelan9688
2 жыл бұрын
Perfect explanation. Thank you
@qwm1007
2 жыл бұрын
A great explanation! Thank you!
@wypmangames
Жыл бұрын
Guess before watching: bigger ships need bigger (or more smaller) engines and having more/bigger engines means more speed Edit: not only was i wrong, but big engines being expensive fuel wise and frowned upon from environmental perspectives actively counters my idea Its really cool to learn stuff like this
@andriianashovam7070
2 жыл бұрын
Interesting. It's mostly about wave lengths and hull size! OK. But I need to listen again to understand the details...
@zenolachance1181
2 жыл бұрын
well you did a wonderful job explaining that. I knew about hull speed, but I had never had hump speed explained. this was very informative thank you.... could you do a video on the relationship of Hull speed on sailboats? I was once told that catamarans are so fast because they have twice the waterline but I never knew if this was true or not. I know the overall speed of a sailing vessel with a strict correlation to the length of the hull, but only until you reach a certain speed. I would just like to have a sailboat hull speed explained so thoroughly
@isaiahc8390
2 жыл бұрын
This world is rapidly passing away and I hope that you repent and take time to change before all out disaster occurs! Belief in messiah alone is not enough to grant you salvation - Matthew 7:21-23, John 3:3, John 3:36 (ESV is the best translation for John 3:36) if you believed in Messiah you would be following His commands as best as you could. If you are not a follower of Messiah I would highly recommend becoming one. Call on the name of Jesus and pray for Him to intervene in your life - Revelation 3:20. Contemplate how the Roman Empire fulfilled the role of the beast from the sea in Revelation 13. Revelation 17 confirms that it is in fact Rome. From this we can conclude that A) Jesus is the Son of God and can predict the future or make it happen, B) The world leaders/nations/governments etc have been conspiring together for the last 3000+ years going back to Babylon and before, C) History as we know it is fake. You don't really need to speculate once you start a relationship with God. Can't get a response from God? Fasting can help increase your perception and prayer can help initiate events. God will ignore you if your prayer does not align with His purpose (James 4:3) or if you are approaching Him when "unclean" (Isaiah 1:15, Isaiah 59:2, Micah 3:4). Stop eating food sacrificed to idols (McDonald's, Wendy's etc) stop glorifying yourself on social media or making other images of yourself (Second Commandment), stop gossiping about other people, stop watching obscene content etc. Have a blessed day!
@leandrometfan
2 жыл бұрын
I feel like i learned so much in a short time, what a great video.
@mediocreman2
2 жыл бұрын
Anyone who's been in a small ski boat knows what the hump speed is and how painful it feels. It's like you're just spinning your wheels. I feel like there's more to these concepts that you probably didn't have the time to explain, so I'll see if I can find more info.
@EntropicTroponin
2 жыл бұрын
Amazingly well explained!
@damienkramer
Жыл бұрын
Seeing those jet engines on the side of the ship at the end makes me really want to see this happen for real. I know it’s not realistic but the boy inside me really wants it
@lewis7315
2 жыл бұрын
large displacement racing sailboats often have almost no quarter wake and very little bow wake... their size determines their speed...
@beesechurgr0
2 жыл бұрын
in watersports planiong is the worst unless you are skiiing but for wake surfing boarding and tubing its just unplesent and hump speed is actually the best for wakesurfing
@richpontone1
2 жыл бұрын
Read an article from The New Yorker Magazine. On the average, 50 to 150 Cargo Containers fall off from a Ship per Ocean Voyage. Sure is a lot of full Containers which sunk into the Ocean depths. Lot of contamination and pollution too.
@Icetea-2000
2 жыл бұрын
Really informative video! I happened to literally ask myself this question recently lol
@GodlikeIridium
2 жыл бұрын
Very interesting! I didn't know that ships just move at the most efficient speed in that valley of the speed vs resistance graph, which correlates with the size of the ship.
@jpaugh64
2 жыл бұрын
Not all ships do, but cargo ships would, certainly.
@hungerknives
2 жыл бұрын
Well that was interesting, thank you for the great video!
@criticalfxck13
2 жыл бұрын
that thumbnail gave me a serious Muscle Man moment
@criticalfxck13
2 жыл бұрын
YOU KNOW WHO ELSE HAS A FAST HUMP SPEED? ... i'll see myself out 0
@abnurtharn2927
2 жыл бұрын
A 20 foot sailboat as pictured at 3:16, can without problem pass 12 knots, even push 15. Other than that I agree with you,
@jpaugh64
2 жыл бұрын
Yeah... I think he was strictly talking about the most economical speed to run cargo routes at. He didn't even bring up tons of potential caveats, like engine power and hull width.
@abnurtharn2927
2 жыл бұрын
@@jpaugh64 Agree.
@adriaanboogaard8571
2 жыл бұрын
Do what makes the world a better place by using things you have a talent for not just go to school for what makes $ .If you have food water heath and shelter . My mother survived WWII in Europe told me that make the best help by sharing when you have extra with others that have less .
@emilgil1490
2 жыл бұрын
BASICALLY: Big ships are faster because their surface under water ( creating hydrodynamical drag ) to cubature ( containing engine and fuel ) is smaller than for small ship. It is comparing surface ( 3x^2 curve ) to qubature ( x^3 curve ). It is this- mathematically- same reason for wich small things are cooling faster: their surface ( radites the heat out ) is big in comparison to volume ( amount of heat to radiate out ). And this things about waves: all being a very fine add to it.
@frankjones4550
2 жыл бұрын
You need Power, not Energy, to overcome the transitions. Energy is Power X Time. Great videos though, thanks.
@emilysmith6897
Жыл бұрын
What about surface area to mass ratio? Resistance is proportional to surface area, which scales proportional to L^2, but mass is proportional to L^3. Volume is also proportional to L^3. Which means less resistance per mass cargo for larger ships, and hence less fuel burn per unit cargo. Or alternatively you can take a higher speed instead of less fuel burn.
@tompsheridantsheridant7354
Жыл бұрын
DARZHNARZHERLARBLE? DARZHNARZHERLARBLE?
@hiasausmwoid1247
2 жыл бұрын
Awesome explanation!!!! Thx
@brentfellers9632
2 жыл бұрын
Excellent! Thanks KZitem algorithm
@edhikurniawan
2 жыл бұрын
Me at Ultimate Admiral Dreadnought : 60 knot destroyer, which is more than twice the expense of a rational Battleship.
@barongerhardt
2 жыл бұрын
Interesting video, but the comments of figuring out the hull speed for water sports is a little impractical. Most performance ski boats are in the 6-8m length leaving the hull speed (5.5-7 kph) well below speeds needed to keep a skier up or provide much excitement for inflatables. Even hump speed is too slow for many contexts, but modern wakeboard boats are designed to stretch being on plane to require higher speeds.
@ThatsMrPencilneck2U
2 жыл бұрын
I remember coming across the topic of hull speed in Dragon Magazine of all places, when I was in my early teens. This had quite an effect on my thinking, as the notion "smaller is faster" is a popular misconception. This was before I was reading about pre-WWII bombers being faster than the fighters of their day. It was then I noticed other things. A little Triumph Spitfire couldn't go as fast as a big Chevy Camero. The Mach 3.5 SR 71 was bigger than the Mach 3 Mig 25, bigger than the Mach 2.5 F-15, bigger than the Mach 1.8 F-16. The trend wasn't perfect, as aircraft, like Dassault Mirage 2000 perform well above their weight class, but I thought the trend was clear. In the case of aircraft and passenger cars and airplanes, the bigger the frame, the more room you have for the engine, compared to the driver. I saw an article on space navies, and somebody was giving the advice that smaller ships should be faster. After reading this, would it surprise anybody that I had to disagree?
@oldmandan5634
2 жыл бұрын
In space there isn't resistance so it would be a simple energy to mass issue. Also, with small things like cars and planes, even if the wake of the air did have an influence, you would overcome the "hump" speed very quickly. The only case where air waves and size really comes into play is with supersonic flight. Aircraft performance over through the sound barrier is a completely different issue and has a lot to do with where the air around the frame is reaching supersonic speeds (which is why most supersonic aircraft us delta wings which allow the jet to push through the barrier more easily). The wavelength of the water effects boats so drastically because of the immense mass of the water compared to the craft.
@ThatsMrPencilneck2U
2 жыл бұрын
@@oldmandan5634 With hydrodynamics, the concept of hull speed make the concept of "smaller is faster" universally wrong, with all things being the same. Of course, small craft can use surface effects, and skip from wave to wave in a manner that would break a larger hull. I just noted that the idea of "smaller is faster" is usually wrong, as things tend to have to be made bigger to house bigger engines. I would find it aesthetically pleasing in a sci-fi setting to have a larger spacecraft go faster, as with sailing ships, the one with the longer hull would generally be faster, as it not only had the higher hull speed, but more space to for sail masts. In the case of spaceships using their main power plant for locomotion and powering weapons, capital ships would easily outrun their escorts. Come to think of it, I've heard US Navy aircraft carriers tend to do that.
@Bloodwyn1756Swagger
2 жыл бұрын
feet, knots, football fields. Very helpful.
@Stylefront
Жыл бұрын
Awesome content!
@sherryneglia4804
2 жыл бұрын
actually makes perfect sense
@wiwersewindemer4437
2 жыл бұрын
Would I be correct in saying the higher weight of bigger ships also afford them a higher inertia, meaning they can easier coast along?
so if I am getting it right, the most efficient speed for all "displacement style" ships is slightly over hull speed?
@jpaugh64
2 жыл бұрын
I think so. But also, interesting! What's an alternative to displacement style hulls? Are you talking about hovercraft, because I maintain that they're aircraft. 😜
@bruceblunderfield5431
2 жыл бұрын
Square root of the length in feet of the boat or ship? Multiplied by 1.34 is the best you will get from a displacement hull in knots/hr. Yes bulbs on ships help. But lengthening a ship by 300 feet? Brought many a ship undone breaking in the middle of the wave cycle.
@andy02q
2 жыл бұрын
For a moment I thought about whether there is a market for ultra high powered cargo ships for goods that need to be delivered very quickly, but then I realized that there's airplanes for those.
@davidho2977
2 жыл бұрын
Hump speed?! I thought that was something pornographic.
@АйбулатИсхаков
2 жыл бұрын
Wow, I didn't even have the idea of all this
@bencheevers6693
2 жыл бұрын
Does that second dip in the graph represent planing resistance? I would have thought that was where the boat has the least resistance but the graph shows a lower valley between hull speed and hump speed?
@DaytonBelAir
Жыл бұрын
In Germany we say: "Länge läuft" witch means length is running
@Ingvar-spb
Жыл бұрын
Суть видео: Расскажу про то почему большие корабли быстрее... Правда совсем ничего не скажу про тоннаж, водоизмещение, силовую машину, парусность, осадку ... Но вы можете использовать эту формулу 2:50 с извлечением квадратного корня, которую я взял с потолка, и не буду объяснять её смысл. Вот мне просто интересно, а если вязкозть воды изменится, то ведь и волнообразование изменится. А не пойдёт ли в таком случае вся эта арифметика лесом ? Мы ведь всё время обсуждали здесь крейсерскую скорость ? Максимально допустимую? Или экономически целесообразную (максимум скорости при минимуме расходуемого топлива) ?
@yunusjauhari
2 жыл бұрын
10 Juni 21:35 Nonton KZitem 21:40 Kekamar Mandi 21:42 Casual Navigation Why Are Big Ships Faster Than Smaller Ships 21:50 Kekamar Mandi
@CJMattias
2 жыл бұрын
Sounds quite intuitive. You got an almost exactly similar ship twice the size, you're probably gonna have twice the speed.
@gpodobas
Жыл бұрын
Nice. that's around 20 videos from You I've watched on subject I don't care. Time for more ;)
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