The Boat with Propellers in the Front 

Cavitation is a wonderfully interesting thing to research

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

This looks like something that batman would use

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

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

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

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

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

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

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.

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

Pov:you have 5000 teeth

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.

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

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

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

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?

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 .

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...

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

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

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

Just repositioning propellers upfront would change the shipping industry forever.

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.

All that in the beginning is describing cavitation.

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

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

stealth boat from SharkBite moment

Batman's boat just got in the market

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

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

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.

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

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

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

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

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.

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

They also benefit from screwing through relatively undisturbed water.

Wouldn't they be impellers then, and not propellers?

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

These propellers are called Dolphin killers

Feels like it should have water jet propulsion given its design. I assume that would significantly reduce fouling on lines / ropes?

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.

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.

No doubt that's a wonderful concept! But need to do something abt the fishing nets..

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

Animation of the duel props showed both rotating in same direction. Turns opposite!

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

There's been torpedoes that use this since the Coldwar.

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.

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

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

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

stealth boat from sharkbite

If it was cavitation they would have no propellers left, and they wouldn't move as fast.

It's called cavitation.... It's not what you think...

Should make this for just regular recreational boats... would probably turn better aswell (Althought I'm not sure about that)

You could drive this boat in the game shark bite

Another word Less turbulent, less cabitation In the water😅

so what about a submarine with frontal propellers?

The ultimate pontoon boat

How to defeat a countries navy : use a fishing net

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.

I've been saying for decades that it's worth it to pump air out of the hull at many small strategic points to reduce friction.

Swap the propellors at the front of the submarines for water jets at the rear. Blow the exhaust gasses out the bows to create cavitation and reduced drag. Problems solved. You're welcome.

And it wears down the blades.

*_YO IT'S THAT STEALTH BOAT FROM SHARKBITE_*

All that protection and lost to the fishing nets😂😂😂

sharkbite ahh boat moment

Anyone else get nauseous seeing that rope near that propeller? 😳🤣

Still think the ss United States is faster?

Why use exposed props? What’s wrong with using an axial turbine inside those pontoons?

Won't any prop get tangled in fishing nets?

It's exactly what i thought!!!

Put a lifting wing on it

This would be great for coastal defense or special operations

Impeller.... jeezus

Its like u treat water like air. Water shows physical flow around things like air does invincibly

Just like front wheel drive

Actually, thats exactly what I thought

TOMOROW NEVER DIES, the Carver's stealth ship.

Beautiful amazing fishing boat America pantastic❤🇵🇭🇵🇭🇵🇭🇵🇭☝️👍🙏🙏🌏🇵🇭🇵🇭

А наш "Шквал" - не мультфильм!😂...на вооружении !!!!..... Дружить нужно с Россией!!!! Иначе плохо вам придется 😂

Hold on? 900 times less resistance? Water only has 738 times more resistance than air?

thats a sharkbite boat

May I ask you how much fuel it's consume?

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

La Guardia Civil española debería estar equipada con estos aparatos, y doblar el sueldo de los mismos, por peligrosidad

It's kind of crazy this isn't researched more. Answer is probably the OIL INDUSTRY

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!

Super Cavitation

Reminds me of the stealth boat from Tomorrow Never Dies

How do you have "nine hundred times less" of anything? If I start with 100 pounds, is nine hundred times less than 100 = 100 - 900 X100 = 100 - 90,000 = (89,900) pounds. What are negative pounds? Is that some kind of giant vacuum creating a magical perpetual motion machine that glides at a speed of infinity? No, of course not, which means you are stupid with your nine hundred times less nonsense.

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.

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.

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

PLANE !!!!!

So it's something like a half-ekranoplan.. would be cool if ir would had some RATO and deployable wings/winglets so it could take off for a while to avoid obstacles.. nevermind me, just some scifi imagination

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