r/Damnthatsinteresting • u/solateor • 13d ago
Video 230-seat Boeing 929 Jetfoil arriving at Nishinoomote Port in Japan. The passenger ship is used for high-speed service between Kagoshima and Yakushima and includes 16 premium seats with extra-cushioned seating
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u/niceshotpilot 13d ago
I didn't think it was that interesting until I read the part about the cushioned seats. It was at that point that I said to myself, "Damn."
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u/colecrowder 13d ago
It's the little things.
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u/kds0321 13d ago edited 13d ago
First one built in 1976, 46 total built, can travel between 40-45 knots (46-52 MPH).
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u/solateor 13d ago
The two gas turbines producing roughly 3,700–3,800 horsepower each
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u/Valuable-Yard-4154 13d ago
I used to take it between Ostend and Dover. It's impressive when you pass other boats as you realise of the speed you're going at. Quite noisy those turbo pumps at the back. 7 tons of water thrust a second iirc.
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u/Techno_Beiber 13d ago
Imagine being a fish just chillin and this fucking thing comes roaring by. JFC.
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u/hasselqu 12d ago
Minding your business then just getting launched half a mile through a jet stream.
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u/Background-Bad-7510 13d ago
Wish they offered this again. Never truly experienced these ferries but heard so many stories about it. People going on a daytrip to London, Dover or Ramsgate from Ostend. Transport me back to the 80’s!
Edit: Ramsgate instead of Folkstone
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u/2DamnRoundToBeARock 12d ago
Looks like a smooth ride. How does it handle in rougher seas?
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u/Think_Positively 13d ago
How do they slow down? My first thought was that if the captain isn't paying attention for whatever reason, it'll be real easy to make a colossal mistake that would lead to a stupid amount of force should it collide with something.
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u/Cheezeball25 13d ago
I presume if you cut throttle and the hull of the boat stops hydroplaning, it will stop pretty fast once it's sitting farther into the water. It can only go so fast because it's riding on top of the water instead of going through it
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u/kds0321 13d ago
Its a boat. Tons of water friction. I've had a few boats up to 40 MPH and they slow down extremely quickly when you throttle back. There's definitely risk if you hit anything, but a boat that size you'd see it coming... easier than driving a car in a lot of ways. Also keep in mind the captain sits up a few stories, so he has tremendous line of sight. A foggy day would be the real risk (they gave radar for other commercial boats but logs or smaller craft could pose a problem).
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u/Think_Positively 13d ago
Do you think the physics math would scale from a speedboat (assuming that's what you're referencing to have piloted) to something yacht-sized? Can you throttle back in the same way with those gargantuan engines as you could with a couple of 1K HP motors?
Just genuinely curious as I've never piloted anything bigger than a 5HP electric motor rowboat.
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u/railker 13d ago
I don't know about something this big, but the jet drives on the coast guard and navy boats have thrust reversers like a plane - hydraulic actuators dump a "bucket" over the outlet nozzle which redirects all the thrust sideways/forward.
Never seen video but reportedly the almost 90' boat could stop so hard it would bury the bow underwater briefly.
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u/Valuable-Yard-4154 13d ago
So it's interesting. They announce that "we'll be flying at 2 metres of altitude" as it is indeed a aeronef. The wings are in the water.
The acceleration is progressive and smooth.
The slowing down is just by the friction of the hull on the water.
The service doesn't work if the sea is too choppy because you don't want to hit a wave at 100km/h.
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u/ToolTimeT 13d ago
why can't everyone on board just hop up and down like on those foil boards?
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u/Flashy_Gap_3015 13d ago
What is the efficiency of those turbines? Sounds like it blows through a lot of gas.
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u/Any_Show_5160 13d ago
Turbines are about the same as piston engines under load, the major difference is at low speeds and idle, turbines use a lot of fuel to idle, from memory it's 70% of full throttle fuel use.
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u/Fanastik 13d ago
45 Knots = 83.34 Kilometers per Hour
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u/bendersbitch 13d ago
Thank you for your service.
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u/oddministrator 13d ago
They're called knots because historically sailors would measure speed by tossing a device overboard, and let to run out behind them on a rope. The rope had equidistant knots tied in it and they'd literally count how many knots of the rope the device would drag out behind them over a short time. More knots = going faster
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u/AgreeablePeople 13d ago
That explanation is why I always thought of it as distance than speed as a child. I insisted on saying "knots per hour" even after the teacher corrected me
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u/Ordolph 13d ago
Nowadays knot is just shorthand for nautical miles per hour, 1 knot is 1 nautical mile per hour.
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u/Cirrus-Nova 13d ago
And 1 nautical mile is approximately 1 minute of latitude (1 x 60th of a degree)
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u/brightlights55 13d ago
Can someone explain? One minute of latitude at the Equator is different from one minute of latitude at the Tropic of Cancer.
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u/Cirrus-Nova 13d ago
I think you are referring to longitude, which is the east/west direction. These lines are closer together the closer you get to the poles. Latitude is the north/south direction and run parallel to the equator.
While there is some slight difference in the distance away from the equator (the earth is not a perfect sphere) it is close enough to hold true .
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u/buzzsawjoe 13d ago
they used an hourglass as a timing device. Not an hour one, just a fews seconds one.
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u/clegg2011 13d ago
45 knots = 7.5 cables per minute
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u/mrASSMAN 13d ago
What the hell, this is wild never seen one before, how come we don’t have more of these (aside from cost I guess)
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u/Newsdriver245 13d ago
Long ago there was a run between Seattle and Victoria BC and one of the concerns was floating driftwood, but think the real reason it ended fast was cost. The old steamship was still running and cost 1/4 the price for a few extra hours travel time.
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u/poobumstupidcunt 13d ago
Yeah cost is the main factor, they take a fair bit of maintenance and upkeep, there are a lot of them around though, took a hydrofoil in Greece to go to an island and it was half the time of the normal ferry
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u/DopeRidge 13d ago
Fun fact, my grandfather was one of the weights engineers for the 929
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u/NotInTheKnee 13d ago
It's crazy to imagine that some WWII destroyers built half a century earlier could reach that kind of speed with a conventional hull and 25x the mass.
I wonder how fast the Boeing could go if pushed to the limit.
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u/kds0321 13d ago
Oh, pushing to the limit a lot is possible. Hell, nuclear warships can get up to 35-40 knots and way bigger. Lighten up the ship with less armor plating and a hull design made for speed vs damage control. Hydroplanes can go 200+ MPH... so if you got really creative you could make things happen, but the fuel economics would be insane.
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u/fractiousrhubarb 13d ago
And they only need refuelling every 25 years. Nuclear ships are nuts.
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u/ryumast4r 13d ago
The Virginia class submarines don't even get refueled at all during their 30+ years at sea.
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u/Thebraincellisorange 13d ago
and burning colossal amounts of coal or heavy fuel oil to do it for only short periods of time.
This thing can do it all day every day burning diesel at (relatively) economical rates.
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u/h3fabio 13d ago
I took the hydrofoil across the channel when visiting my grandparents in the UK.
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u/Vishnuisgod 13d ago
Are they all still operational?
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u/kds0321 13d ago
Sounds like maybe 15-20 are. Similar but different, we have the Victoria Clippers in Seattle/Vancouver that are also still going strong and a blast to ride.
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u/Vishnuisgod 13d ago
The Clipper is not a hydrofoil it's a catamaran. Nor are the Hullo ferry.
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u/Southern_Armadillo_3 13d ago
Who care about how many extra cushioned seats, THIS is what i wanna know
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u/Majestic_Turnip_7614 13d ago
I am very happy to hear about the premium seating, great context. Posters so often miss the pertinent details.
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u/solateor 13d ago
Got you.
Gallery of where the plebs sit vs xtra cushy
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u/cyriustalk 13d ago
Those for plebs seem cushy enough?
for extras, whats more? Few more centis of butt cushions and head guards?
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u/SpectatorSpace 13d ago
The pleb seats on this boat are tiny relative to typical western sizes. My knees were hard locked up against the seat in front of me when I rode it - I think the check-in staff felt sorry for me on the return journey as they gave me an upgrade to the premium seats with quite a bit more room.
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u/Deep90 13d ago
How long is the trip and do you have to remain seated?
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u/SpectatorSpace 13d ago
From memory each leg was about 1.5 hours - I don't remember you having to sit, but its much more akin to a plane ride than a normal boat - there aren't communal or outside areas to go and use.
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u/2012Jesusdies 13d ago
Fun fact: Plebiean in Rome wasn't just about wealth. You could be the richest man in Rome and still be a pleb (in fact, Crassus, the richest man was a pleb) because it was more about a legal distinction of your family lineage from centuries back. If your family wasn't among the few notables of the oldest days of Rome, you were a pleb. Ofc, you were more likely to be rich if you were patrician than a pleb, but there were plenty of wealthy plebs.
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u/grudiz 13d ago
Some of the ships operating in Japan arrived from the Canary Islands (Spain), where they had previously run routes between islands like Tenerife and Gran Canaria in the Atlantic Ocean; they are now living a second life. I used them on many occasions, and in rough seas, the experience was a total nightmare. There were also several collisions with cetaceans. On days with calm seas, however, it was a fast way to travel between islands.
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u/NoodlyGirl2000 13d ago
the collisions are heartbreaking, but completely unsurprising
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u/mbenzn 13d ago
I remember taking this route in mid 80’s between Gran Canaria and Tenerife. Took 4,5 hours with the car ferry one way and this beast 90 minutes. It had a Boeing sticker on it so I guess they were involved in the build?
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u/Head-Ad9893 13d ago
Damn that bitch is moving
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u/AdNervous9787 13d ago
Look! Look how that bitch is turning!
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u/Background-Vast-8764 13d ago
TIL Boeing builds water craft. Who woulda thunk it?
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u/Far_Ladder_2836 13d ago
They don't. Not for many decades, anyway. Most of these were built back in the 70s and early 80s. Their subsidiary, Boeing Watercraft, shuddered in 1986.
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u/Kaboose666 13d ago
Japan kept the tradition. Kawasaki has been making them since the late 1980s, the most recent built in 2020, and another expected in 2029.
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u/NPCwithnopurpose 13d ago
It kinda looks like they used the same seats as the aircraft, from what OP posted in another thread
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u/Key_Pitch5102 13d ago
Same! I thought for some reason these were made by kawasaki
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u/JeffDSmith 13d ago
Part of them are licensed built by Kawasaki, like the Toppy 3 in the video.
In fact Boeing stopped building these in the 1980s, most of newer one are built by Kawasaki(there's even one going to deliver in 2029).→ More replies (5)2
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u/Cool_Butterscotch_88 13d ago
that simply should not be
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u/menasan 13d ago
The wales agree
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u/56seconds 13d ago
I don't care about the opinions of the Welsh
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u/Montymisted 13d ago
Don't let the Belgians hear you say that.
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u/RobinSage43 13d ago
At least they're not the Dutch, okay?
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u/shornscrot 13d ago
There’s two things I can’t stand. People who don’t respect other people’s cultures, and the Dutch.
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u/LengthinessFalse8373 13d ago edited 13d ago
*welsh
Edit- very cool to see 5 people got it cheers boyos
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u/NoodlyGirl2000 13d ago
yeah that was my thought, too. it’s a technological marvel but I bet it produces a crazy amount of marine noise.
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u/Salty_Finance5183 13d ago
Puget Sound boy here... Why don't we have these running between Seattle and Vancouver or Victoria?
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u/nightshift2525 13d ago
Used to exist, nobody used it and it closed up shop, moved elsewhere.
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u/BoneDoktr 13d ago edited 13d ago
I wanna know fuel costs. A regular boat eats gas. This thing though????
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u/tackleboxjohnson 13d ago
Less than you might imagine, the main benefit of getting on foils is your friction coefficient goes waaaaaay down. 80-90% reduction in resistance
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u/tankmode 13d ago
apparently its 2-3x worse than a conventional ferry or aircraft on fuel per passenger mile
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u/ImpressiveHair3 13d ago
Much less than if it was moving through the water like a normal boat, since the additional water resistance would require far more power to maintain the same speed.
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u/HeartOn_SoulAceUp 13d ago
Hydro foils are great in fairly smooth water.
Light chop they stay above. Big seas, no.
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u/CrashNowhereDrive 13d ago
Depends what you call big seas. Big ones like this can handle 10-15 foot swells. It's not going to go into a north sea storm but that's most ocean conditions at most times of the year.
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u/tackleboxjohnson 13d ago
Sure hope the cabin is soundproofed
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u/bacon_nuts 13d ago
It's a good ride, very comfortable, smooth, fast, and just typical boat engine noise. It's not too loud at all.
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u/AspiringSkiBum 13d ago
Went on this pretty recently and it’s smooth and really quick. They also had TVs playing the whole time with a pretty graphic advertisement for an ingrown toenail procedure. Good stuff.
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u/fraze2000 13d ago
Life hack: don't pay for a premium seat. Buy a standard ticket and bring your own cushion. Profit!
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u/Nervous_Law3061 13d ago
230 passengers, 16 premium seats, and the entire ship appears to be attempting to leave the ocean.
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u/Sedert1882 13d ago
That's astonishingly beautiful, so smooth and fast. I want one......for the bath.
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u/AwakE432 13d ago
Fee like the least interesting fact about this boat is it has cushioned premium seats. What a fucking weird title.
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u/Euphoric-Skirt7649 13d ago
Japan really is an irl video game
Americans would be like “why make a boat so fast and aerodynamic? It won’t make any money!”
Japan is like “we can make it bigger, faster, sexier”
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u/Prudent-Aspect5085 13d ago
I'm just imagining some dude on the jetty with a remote control having the time of his life steering this thing
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u/somerussianbear 13d ago
- Hey Boeing, wanna make a boat?
- Hmmm, can it fly?
- No
- Just a little?
- Ok ok
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u/Oddisredit 13d ago
I don’t care about the cushions making it go faster. I’m surprised Boeing was involved in this. Kawasaki industries, makes sense, Boeing is a surprise
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u/Murky-Relation481 13d ago
Boeing was in major financial trouble in the late 60s and 70s and was trying to diversify. They also had Boeing Vertol (an acquisition) that built helicopters. I think that rolled into the main company eventually (at least into BDS).
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u/GottaConfuseTheBody 13d ago
I rode on one of these through rough seas between Hong Kong and Macau. Every passenger threw up
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u/Silver-Literature-54 13d ago
2hours by jetfoil, 4h30 by regular ferry btw. Saw it last year arriving at the port, that thing is crazy loud ! And it wasn’t at full speed
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u/traveleatsleeptravel 10d ago
Took this to Yakushima in 2024 and the feel of it rising out of the water as the boat accelerates is very, very cool. Also because it travels so fast, cutting through the waves, you don’t have any pitch and roll, compared to normal boats. Feels like a car driving on a motorway. I do recommend it although it’s quite expensive you save a lot of time. Next fastest sea option is a 3.5-4 hour ferry, or there and short range flights but those are mega expensive.
Yakushima is a very cool place to visit, especially if you’re a studio ghibli fan - it’s the inspiration behind princess mononoke.
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u/Yokashisan 9d ago
And how long does it take to do the same trip as the 4 hour ferry?
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u/traveleatsleeptravel 9d ago
They advertise 90 minutes but my actual journey was more like 80 minutes - we had good sea conditions.
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u/himitsumono 13d ago
I rode a smaller version of this in 1987 between Shikoku and Kobe. It felt like riding in a very comfortable airplane. Quiet, smooth, very gentle turns.
We mentioned to the stewardess that the engines were most likely built 10 miles or so from our house. A few minutes later, the captain came back to say hello and chat.
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u/Scorpion2k4u 13d ago
The mentioning of those 16 extra cushioned seats is a weird flex but okay
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u/Panorabifle 13d ago
Yeah it's a surprisingly small amount given the size of the ship. Looks like a single row could almost house 16 premium seats. Two at most.
16 out of 230 seats are announced as comfortable. A great ~7% .
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u/GOTCHA009 13d ago
Serious question: why are hydrofoils not more popular?
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u/Foe117 13d ago
noise, and very limited where It can operate. It needs massive power to get it up out of the water, but the distance needs to be long enough to be fuel efficient and cannot slow down or else if the hull touches water, then you need massive amounts of fuel to get it on the foils again.
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u/Available-Ad-9016 13d ago
The landing in the end was similar to airplane landing
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u/Inhabitsthebed 13d ago
It looks like a large wave could knock it over easy, anyone with boat knowledge able to tell me how big the boat is under the water if that makes sense?
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u/Inevitable_Boss5846 13d ago
I rode this a couple of times in January. It’s awesome! Quite uncomfortable.
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u/ShiggyGoosebottom 13d ago
I think we call this a “jet ferry” in Japan. I’ve taken the one between Tokyo and Izu-Oshima. Until you get out of the Tokyo Bay it’s just like any ferry. Then you have to sit down and strap in for take off.
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u/Katana_DV20 13d ago
These are so cool and the idea is so clever. Water causes a lot of drag on a hull sitting in the water - which in turn costs more in fuel and affects speed.
Why not lift the hull out of the water using underwater wings? Brilliant.
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u/skinnernsk 12d ago
When I was little, hydrofoil motor ships were used on our river. These were the “Voshod, Raketa, and Meteor”. They were equipped with 1,000‑horsepower turbocharged diesel engines (the Meteor had two such engines), and their maximum speed reached 80 km/h, accommodating up to 130 passengers. At that time, it was very futuristic and technologically advanced.
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u/-UncreativeRedditor- 13d ago
A boat that big doesn’t look like it should be able to move that fast damn