The Boat with Propellers in the Front

Why this boat has propellers in front is #notwhatyouthink
#NWYT #shorts
Music:
Universal Solution - Robert Ruth
Footage:
Select images/videos from Getty Images
US Department of Defense
Note: "The appearance of U.S. Department of Defense (DoD) visual information does not imply or constitute DoD endorsement."

[@The-Caged-King]

Cavitation is a wonderfully interesting thing to research

[@westrim]

The dentist says I have a couple in my molars

[@Dr.Kraig_Ren]

​​@@westrimTell me your location. You are a research material for my PhD 😅

[@ion8264]

​@@Dr.Kraig_Ren DR. I see you everywhere I go lol😂

[@Constant_Distant_Instant]

​@@ion8264you must be a stalker😂

[@anthonys7311]

Basically bubbles popping eats steel right?

[@gtALIEN]

10 million dollar military vehicle vs some random fishing net, who would win

[@JosefGorz]

10.000.000 $ is probably what the paintjob primer costs... but funny analogy nonetheless 😂😅

[@chickenfishhybrid44]

Standard arrangement vessels can also have issues with fishing nets or other objects getting caught up in their propulsion systems.

[@preretcon]

What about a Shark?

[@joshcmichaud]

Concertina wire can stop a tank

[@twigdayzclips2859]

@@JosefGorzyou must be a politician with those numbers. Pocketing 99% of that money lmao 😂

[@LaGuerre19]

Turn ons: low-friction cavitating pontoons, azimuthal bow propellers Turn offs: FISHNETS

[@kyototomokui6676]

So no fishnet stockings for her, I take it?

[@harrishayes5120]

I don’t think these are azimuthing props, just contra-rotating fixed shaft props. Definitely wouldn’t wanna hit a net or anything else tho lmao

[@koobs4549]

May I suggest a minor change to improve your excellent joke? Change fishing nets, to fishnets & the joke lands even better as a clear double entendre

[@LaGuerre19]

@@koobs4549 oooh that's good. Done.

[@kyototomokui6676]

So no fishnet stockings, sad.

[@mrmemexman3209]

This looks like something that batman would use

[@markmilan8365]

Batfish

[@nathgibs03]

100%

[@jeffm4491]

​. Mr., or is it Doctor? FREEZE should have been called Polar Bear Man 😂

[@sukawatsaardaiam]

ครับ แบทแมน ครับ 😊

[@TheLiamster]

It’s a shame this boat never entered service. It would be great at operating in littoral waters

[@user-do5zk6jh1k]

Should have revisited it as an unmanned platform for distributed lethality

[@jamesrosewell9081]

Literally. Lol.

[@fidjeenjanrjsnsfh]

Maybe because it can be crippled by subsistence fishermen...

[@JaneDoe-dg1gv]

@@fidjeenjanrjsnsfh oh, sharpen the blade edges perhaps?

[@vyvianalcott1681]

@@JaneDoe-dg1gvTell me you don't understand the mechanics of cutting edges without telling me you don't understand the mechanics of cutting edges. Hey siri what are "chainsaw chaps"?

[@brucelownhole]

If a problem can't be overcome, use it as an advantage - Sun Tzu (probably)

[@sdimartino]

Move like water. Attack the enemy where they aren’t.

[@sukawatsaardaiam]

ล้ำลึก และลึกล้ำ แถม ลับลึก แบบ ล้ำเลิศ ครับ😊

[@333_studios]

You can’t tangle my props if use the fishing net myself!

[@countryracer69]

As a hobby boat builder I should probably not know this!

[@creeperizak8971]

aha ha ha, I suppose it's too late now.

[@DiaEule]

I'm thinking pontoon party barge!

[@RDAmidwest]

Your path to riches & fame! 🎉

[@Boi-Faan]

Icebreakers can also use compressed air on its hull to help slip over ice and better crush through the ice.

[@thomaspayne6866]

I felt that, and I wish you luck as well as temporary memory loss.

[@stevencoble6769]

"Most drug running boats and subs carry a giant amount of fishing nets, but its not what you think."

[@sukawatsaardaiam]

พวก เขา ไม่ จำเป็น ต้องผลิตแล้ว หรือ ครับ ถึงได้ มีอวน ตาข่าย ไปทำประมง บ้าไป แล้ว โลก ใบนี้ 🤘 หรือบางที่ เรา พักผ่อน น้อยไป ก็ ทำไห้ เกิด วิตกจริต ได้ ครับ .ผมรู้ มา แบบนี้ จาก คนต่างประเทศ บ้าง คนไทย บ้าง สำคัญ ตรงพักผ่อนครับ 💐🇹🇭

[@garethevans9789]

Oh, and Volvo Penta has forwar facing probs. The engines (more pods) are still at the rear of the boat. They also pump the exhaust gases out of the center of the propellers (removes/ hides particulates and the smell). Some interesting tech.

[@dba1862]

SWATH, small water area twin hull, I worked with the original Navatek in Hawaii for several years in the 90s, enjoy seeing it in the movies.

[@sukawatsaardaiam]

ยินดี ด้วย ครับ ทีค้นพบ ความ ที่แท้ จริง จริงหรือครับ😊

[@garywheeler7039]

They need to make a toy plastic model of this for sale and get recognition and eventual acceptance by the Navy!

[@goatking8941]

I think Lego did that once 😂

[@wizard8437]

Fuck no. One fishing net and it’s over. It needs a better design for our military.

[@garywheeler7039]

I don't see why a rear propeller would create unresolvable forces. A diagonal between each uprights is all that would be needed.

[@skyvenrazgriz8226]

And normaly you would avoid supercavitation, it causes material damage. Also the white bubble you see arnt water vapour, these collapse real fast, but solved gases you have in your normal seawater you release by changing the presure dont and thats part of the white trail and it still reduces friction. So hey details...

[@milescoleman910]

Something didn’t sit right with the description for me either. ‘The boiling produces less water pressure’ isn’t it more like all water pressure is the same based on depth but the boat is now half carving through gas? And why is it to be avoided? Just varied pressure causing turbulence and therefore wear?

[@tangofoxtrott7971]

@@milescoleman910because that’s not what the description says?

[@maxhugen]

@@milescoleman910 Think of air pressure in a certain area of the sky. As a plane passes through it, a small area above the wing is at lower pressure, and at higher pressure under the wing. The same happens in a fluid like water... the propeller works like a wing, with a lower pressure before it an higher aft. When that small area of lower pressure falls below the water's "vapour point" some water transforms into a gaseous state as bubbles, and then at the point of collapse, the temperature may be several thousand degrees and the pressure several hundred atmospheres. This violent implosion "pits" the propellers and eventually destroys them.

[@tauIrrydah]

The knapping maintenance on that propellor must require replacing frequently.

[@ww07ff]

Solved gases! Tks for the explanation, I was searching for it!

[@datadumped]

Propellers don't cause water to "Boil at Atmospheric Pressure"! They demonstrate "Paschal's Law" ( PxAxV{at the inlet}=PxAxV{at the outlet}. The "Increased Efficiency" is because the majority of the pontoons are surrounded by air bubbles. Which has less resistance than water. The Navy doesn't like the support arms of traditional "Hydrofoils". Because during Naval Battles there is usually a large amount of "Floatsum" in the water. If the arms are bent, or damaged, the boat may not be able to move.

[@topspeed250k5]

He says "boil at ambient TEMPERATURE" not "Ambient PRESSURE" which is true. At the low-pressure areas of the spinning prop, the water vapourises (boils), creating water vapour bubbles. It's called Cavitation.

[@pseudotasuki]

Ghost is a bit of a local legend here in Portsmouth, NH.

[@JBlade-yl8jy]

From NH too!

[@lionsfaninva5536]

I checked it out at Portsmouth Naval Shipyard in 2017. It was parked by the prison on base. Interesting watercraft.

[@arturoeugster7228]

the low pressure causing flashing, called cavitation, last a very short time , never so large to cover the surface of the swath displacement bodies. The low drag is a result of very low wave drag due to the small waterplane area and long water lenght. The seakeeping behaviour of the RMI swath Halcyon is published by the Coast Guard and immediatelly accessable by clicking. The stability in heavy seas is remarkable, all this in that report.

[@illturralli]

If any boat hits a fishing net, they're screwed. I imagine this boat is able to have the props in the front because of its catamaran configuration (pontoons never leave the water). I can also imagie that having props I'm the front messes with the steering. But that downside is probably be negligible if you can throttle them both individually.

[@calvinnickel9995]

Twin engine airplanes with props in the front go “huh?”

[@paulmyers4986]

Can't understand why the US Navy didn't take a dozen to explore the possibilities

[@xsu-is7vq]

US military prefers to waste money on larger scale

[@Professional_FunHaver]

Trust me, as someone who worked on submarines, they want fast and cheap. This looks well-made, so it's out of the question.

[@AngelaSmith_1970]

Exactly 😢

[@Unpopular_0pinion]

​@@Professional_FunHaverlol

[@UnshavenStatue]

because navy acquisitions is braindamaged

[@willy5716]

Pov:you have 5000 teeth

[@mrpigeo]

SharkBite reference

[@julianowyujie]

Sharkbite moment

[@betoveto80]

Nice reference

[@Cow69420-p]

Sharkbite moment

[@kathleenmann7311]

I learned about cavitation from watching videos and the movie , THE HUNT FOR RED OCTOBER. (One of Sean Connery’s best efforts)

[@raymondsanderson3768]

That underwater pic of the outboard prop, that cord hanging next to it could cause some fun if it got into the prop!

[@mrpigeo]

stealth boat from SharkBite moment

[@PhalanxFPV]

shark bite copied

[@SnakeEyes.MP4]

Lmaoo

[@garethevans9789]

Orcas have been taking-off the rudders of small sailing yachts off the coast of Spain/ Portugal. It's like a game to them, there's been dozens of instances all in the last few years and believed to be a single pod.

[@user-ot9gi5qn6y]

​@@garethevans9789they probably know the people on board are evil and doing bad things on board so the mess with them, its actually God that's telling them to do it

[@kyototomokui6676]

@@garethevans9789LMAO

[@KC-bg1th]

Cruise ships create bubble underneath them to reduce drag as well.

[@garethevans9789]

Nah, that's just hot air.

[@randomjoerandomjoe]

We are making outo shark bite with this one 🗣️🗣️🗣️🔥🔥🔥

[@jesper8836]

I wonder If a very small and thin steel cage-like structure were placed ahead of the blade if that could protect them Just enough coverage to brush off fishing nets, but thin and light weight so it doesn’t hurt efficiency?

[@Homepage.]

Although I’m an avgeek and not a boat guy, we don’t do this with planes over the engines due to airflow so I’d guess probably for the same reason as it would restrict water flow 😊

[@Trainboy1EJR]

Run your fingers through some pool water and feel the resistance, now try the same thing while wakeboarding… hint, it isn’t going to work out very well. If the enemy is using fishing nets in such a manner, there are going to be way worse problems than efficiency to worry about.

[@kyototomokui6676]

What, like a chastity cage for the propellers? That could work.

[@soloflight75]

What about a jet boat engine? I am.thinki g in terms of a catamaran yacht. Perhaps mount the drive system. In the from 20% of each hull. Is mentioned above if the hull material is at risk it may require something other than fiberglass and gel coat. The concept intrigues me but I have no claim on hydrodynamic knowledge. Just thinking out loud.

[@sailingcapedissappointment2012]

Titainium comes to mind perhaps a tunnel fan ....

[@NeduReact]

Batman's boat just got in the market

[@AthleticMetalHead84]

I'm surprised they don't put a wire guard around the propellers so nets dont get sucked up.🤔

[@brrrrrr]

There's a reason they don't put nets over jet engines. It's because it would restrict airflow

[@JakeWitmer]

​@@brrrrrrcould make 'em hydrophobic and heated to reduce/offset the drag...if it worked, it might make the boat worth using in areas it currently is not

[@harrymu148]

extra complexity. I'd just put fan shrouds​@@JakeWitmer

[@A.ston_M.artinfiva]

It’s an old technology, USSR back in time had a navy fleet of this boat . They called KOMETA , they had all deferent sizes in civil and navy services .

[@seabream]

Correct me if I'm wrong, but I thought the Kometa boats and ships were hydrofoils, not pontoon boats. The ones still in operation today that I've been able to find references to are anyway.

[@A.ston_M.artinfiva]

@@seabream actually back in USSR this kind of technology was very popular and above his time. Yes you are correct they had both pontoon and hydrofoil boats and it was a fleet in Volga Don river ( river fleets ) and ( the sea fleets ) Black Sea and Caspian Sea fleets .

[@harrishayes5120]

Rear mounted props aren’t really an issue on SWATH ships, they pose the same issues as mounting them forward. Using the cavitation gas to reduce friction is definitely the reason for prop location

[@raymonde4272]

Great video Richard. All that scrap metal will keep the couple happy. It can't be fun for people with knee or hip problems to walk through the town withall those stairs.

[@DacusMalus1600]

At the same time, the friction is reduced, buoyancy is reduced as well.

[@pedrobedoy9574]

I read that Viking vessels created bubbles around Hull 😂🎉😮😅

[@dairyfreeburger]

I was lucky enough to actually this boat in person when it was up in Portsmouth

[@pseudotasuki]

A few days ago I noticed that it isn't on display any more. There doesn't seem to be anything about it in the news, either.

[@lionsfaninva5536]

Me too. It was parked by the old prison.

[@EchosTackyTiki]

Funny how cavitation can benefit the Navy so much in this case, but can be the death of a ship if it happens to be a submarine.

[@blindbrad4719]

LOL, as soon as you turned it on the submarine would hit the bottom with a thud…

[@mathewca4763]

Cavitation can damage the hull ,as those bubbles collapse it would create pitting on the hull .. This is not a problem in the rear mounted propeller .

[@imc645]

ghost boat: im fastest, im strongest fishermen: are you sure about that

[@user-xg5jd1rg8q]

I love that boat high tech

[@saltysteel3996]

The ultimate pontoon boat

[@MrZinguzi]

To solve the net problem: Put a cage around the propellers. It will also save the dolphins.

[@blindbrad4719]

Drag a smaller Net behind it and you've got free tuna chunks…

[@Robert-cu9bm]

Minced dolphin releases an oil that coats the side of the boat making it more slippery and goes faster.

[@paulopolonio]

And create lots of drag...

[@wanderingbufoon]

but that takes care of the sea's thug problem

[@Cavelson]

Fish nets: What You're Seeing Is Advanced Warfare.

[@tireballastserviceofflorid7771]

All that in the beginning is describing cavitation.

[@markcundiff1697]

There was a similar commercial craft that I took from Dover across the channel to a port in France around 1990 that was discontinued when the bridge😮 between the middle island of Denmark and Sweden was completed.

[@ericblanchard5873]

Not a bad idea with the propellers in the front. Good for oceans and lakes with deep water, I need to build something like this but smaller.

[@justalurker5412]

The dreaded Achilles’ propeller. The bane of captain ghost boat.

[@richtomlinson7090]

They also benefit from screwing through relatively undisturbed water.

[@kurtgain2978]

This is a scaled down version of the original Sea Shadow, a diesel electric stealth ship developed in the mid 90s and unveiled and tested in San Francisco Bay when I was stationed at NAS Alameda.

[@C.B.Bortey]

Is military still necessary? Until we have to defend against extraterrestrial attacks, military should be to teach discipline and order only. Humans shouldn’t be fighting to death anymore! Bless us all for understanding this things. Nyɛ yi ana wala daa! C.B.Bortey

[@Paulywog672]

It's so cool to go see in Portsmouth NH I kinda wish they made it in mass but fixed that problem

[@izzzzzz6]

You can also blend swimmers if your feeling particularly evil at any moment.

[@Whaleydavey]

You had me till the last sentence, which is about the biggest deal breaker possible for any craft that travels in water.

[@leohorishny9561]

That line drifting around the outboard boat motor was scary to watch!

[@joshsanchez4204]

that’s so freakin’ cool, dude. I’ve watched this like 10 times and i’m still pretty amazed. I asked a boat captain about the random bubbles coming off the propellers and he gave me an answer that made me think he was an idiot😂😂😂. Thanks for explaining

[@Draliseth]

This thing looks like if Batman designed a TNG shuttlecraft.

[@jehoiakimelidoronila5450]

Here's my solution: *either make a hydrodynamic deflector cage enclosing the props, and just don't run the boat to a net in the 1st place* Or make the propellers sharp enough to cut the nets... Y'Know what, scratch that; probably a bad idea

[@oildalestar]

This would be great for coastal defense or special operations

[@uuzd4s]

Or a Whale. Boeing tested a Huge 200 passenger Hydrofoil Ferry in SE Alaska in the 80's. It turns out that there were Whales sharing the same waters that couldn't get out of the Way of a 50 mph Hydrofoil which had very little maneuverability.

[@MrLargonaut]

USING cavitation to reduce hull friction? I love humans, keep up the good work!

[@FloridaManMatty]

So basically some guy came along in 2007 and reinvented a smaller Lockheed Sea Shadow that was built in 1984 and got his feelings hurt when DARPA and ONR told him he couldn’t apply for international patents. Got it!

[@pok1pok]

900x less hull friction is probably because the boat is elevated and not touching the water, not so much because of the 'air tunnels'

[@user-li4ek2wx5i]

Интересный аппарат! У него впереди имеется установка воздушный нагнетатель который создаёт перед сигарообразными корпусами воздушный пузырь и сопротивление воды значительно снижается за счёт эффекта кавитации! Таким образом достигается минимум сопротивления воды и этот аппарат способен двигаться со скоростью катеров на воздушной подушке или катеров на подводных крыльях! Есть на вооружение у ВМФ России имеется торпеды с таким принципом движения под водой и эти торпеды способны двигаться на скоростях значительно превосходящих торпеды с обычной стандартной компановкой!

[@aprogress2374]

When it hit fishing net, it's dead on the water 😅

[@Bill-sp8kb]

Unless there's onboard equipment to cut fish nets. I'm sure they've thought of that.

[@makeandexplore208]

stealth boat from sharkbite

[@jerregaming6009]

It also creates shocks potentially destroying the fins

[@ernieghanayem6498]

Water isn’t boiling… it’s all cavitation causing the bubbles to form and improving the vehicles performance. It forms when pressure in the water is changed…

[@tauIrrydah]

The knapping from cavitation must EAT that propellor and must need replacing frequently.

[@panama-canada]

Just repositioning propellers upfront would change the shipping industry forever.

[@shaunsanford2253]

I remember seeing this in popular mechanics magazine ( I believe it was) back in 1996

[@thomasbordelon4149]

Cool concept, fishing net worries would be easy to design out of the equation though.

[@maxhugen]

Cavitation.... I've heard it works wonders on propellers.

[@rudetoy8264]

Doesn’t fish net or fishing line may also caught on rear propelled boat? Hell yes! Have you also seen debris stuck in jet intake of a jet boat? Hell yes! Anytime you use open water to move your vessel, you are subjected to junks in the water

[@pratikmohite6202]

These videos make me feel like a genius it's always as i thought 😂😂

[@Godisknockingx]

Needs a cage screen around the props. That way fishing net won't have the same effect.

[@eventfulnonsense]

Superior, efficient, fastest on water etc. Fishing net: Am I a joke to you?

[@thenukedgamer65]

People talking about fishing nets dont understand warefare. A unmmaed ghost boat,no matter how easy to disable would be a menace to other ships as you could launch a fleet from a strike group. Take the zumwalt class destroyer,it is 600feet long,yet our enemys have to hit a radar signature that appears to as less then 100 feet(much much much much smaller then that but rather not say for reasons) Mount a few missles on one of these and being unmaned would make it a extreamly lethal threat to other ships/fortification or even as a aid for strike teams like seals. And for anyone who has doubt look up the uss cole incident. Formor united states navy so i do know what im talking abouy as i had many chats with our TAC because i was a fanboy of our ships.

[@MrTitnik]

40kts is really good for a "boat" of that size

[@pseudotasuki]

Especially considering its stability.

[@garethevans9789]

Cats don't have the same [hull] speed constraints.

[@bertiesaurus]

??? No 40 knots is average for a military boat of that size

[@justincase1575]

It’s called cavitation! It also destroys propellers over time by eroding the metal.

[@dubya5626]

I guess that the Change Order for contractor to produce fishing net guards for the props was denied funding. Whole project scrapped instead of paying the $150 mil to affix a simple metal cage in front of props. The brass couldn't that one out. Not their job.

[@Captain_439TheUseless-vb7oh]

New Modern Warships vessel just dropped: whatever hydrofoil/ekranoplane this is. Side note: looks cool.

[@billlewis5425]

Water vessels have SCREWS! When the SCREWS turn it creates a column of spiral "threaded" looking water pattern, similar to a threaded shaft. Thus the SCREW on that shaft. Propellers are reserved for airplanes!

[@DOI_ARTS]

This reminds me of The World is Not Enough villain boat

[@shaneolivier1650]

First front wheel "Propeller" drive boat

[@carlossmith7043]

TOMOROW NEVER DIES, the Carver's stealth ship.

[@mtn1793]

So with an optional 3rd stern propeller this boat is golden.

[@Dazdigo]

The problem is when the cavitation bubbles collapse, they can chip off bits of the metal fins and body.

[@billyhndrsn4542]

First thing out of my thoughts is dolphin like to swim in lead of boats. May their sonar recognise the props are in the front now and can be injured.

[@prometheus8404]

This technology that Volvo Marine has on its IPS engines since 15 years. Don't understand why outboard engine manufacturers don't do that too?? They say protecting propeller vs 25% more efficiency, power, gas consumption and speed.

[@lamancha7066]

These propellers are called Dolphin killers

[@azfaa2178]

There's always the Pro's and Con's when you create something better.

[@ImNotCreativeEnoughToMakeUser]

I know that it's not the reason it got the name, but funnily enough, this boat strongly resembles the small ship which docks onto the "Ghost" from Star Wars

[@namesake-uv8ug]

How to defeat a countries navy : use a fishing net

[@glennlopez6772]

More importance should be paid to moving on water. Propeller design ideas should be passed down to the future!

[@markhughes7927]

It is US Military design philosophy to stumble multi-billion dollar projects: a fishing net for this - the need for long runways for F16s - Patriot air defence systems which only face one way. The British designed a tank which clogged up in desert use. One wonders what level of bonkers they attain to and how they recruit in order to achieve it? Same at the top - they are 30 years out of date in strategic thinking and are folding the West up as we speak!❤

[@lillyanneserrelio2187]

No its genius! They make a flawed product. Then they introduce a second generation version that solves this flaw. Repeat business= win 👍

[@ARDG89]

This reminds me of the boat from the james bond movie tomorrow, never dies

[@RDGikTv]

I always wondered how fishes manage to protect themselves from some those big ass propellers 😮

[@Toka972]

All those words just to fail using the correct name for the column of bubbles... It's called cavitation. It's the same principle used for Soviet torpedoes, making them 3 to 6 times faster than classic ones.

[@juliomotaban1354]

Que belleza de diseño, me omagino su excelente desempeño. 😮

[@High_Key]

Reminds me of the stealth boat from Tomorrow Never Dies

[@MamLewis]

I also imagine it couldn't be fitted with any form of Sonar, because of the noise interference the cavitation would make.

[@samorwhatever4485]

That’s super cool the technology. I wonder if the whole friction thing was on purpose or a happy accident trying to fix the rear mounted problem

[@VergilArcanis]

Imagine we got a bigger one of these. It would be a fun yacht

[@vikingbraid7515]

Ha! It is exactly what I thought lol “cavitation”