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Vindskip ship concept uses the hull as a sail

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September 18, 2013

Lade AS's Vindskip concept

Lade AS's Vindskip concept

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With its Vindskip (or Windship), the Norwegian designers at Lade AS have come up with an intriguing concept for a partly wind-powered "hybrid" merchant ship.

No, Gizmag hasn't quite forgotten maritime history, and Lade AS is not proposing a return to the Age of Sail – not quite, anyway. Instead, the concept envisages using a specially-shaped hull to harness the power of the wind.

Though the idea isn't 100 percent wind-powered, Lade AS claims that its apparently patented design would achieve fuel savings of 60 percent while reducing emissions by 80 percent.

How? Well, the company says it has drawn inspiration from the Aerospace Industry to create a hull which it describes as a symmetrical airfoil. The company claims the airfoil helps harnesses a force akin to aerodynamic lift, pulling the ship along, and company manager Terje Lade tells Gizmag that the symmetrical airfoil ensures that "lift" is generated when the wind comes from both port and starboard sides. "You can compare a symmetrical airfoil with a 'normal' sail," he tells Gizmag.

The international patent seems to simply lay claim to the application of an airfoil to the hull of a ship.

The company suggests that a computer navigation system could pull in weather data to plot an optimal course. The ship would use a liquefied natural gas-powered electrical generator for the remainder of its energy requirements and to get going from a standstill.

We welcome your assessment in the comments.

Source: Lade AS

About the Author
James Holloway James lives in East London where he punctuates endless tea drinking with freelance writing and meteorological angst. Unlocking Every Extend Extra Extreme’s “Master of Extreme” achievement was the fourth proudest moment of his life.   All articles by James Holloway
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29 Comments

How would this ship fare in a Force 11 storm?

Alastair Carnegie
18th September, 2013 @ 02:14 am PDT

Not going under any bridges will limit access to some harbours.

I bet it would redefine sea sickness on a whole new plane too.

Andrew MacPhee
18th September, 2013 @ 02:25 am PDT

"You can compare a symmetrical airfoil with a 'normal' sail"

To my knowledge lift of a 'normal' sail (or a plane's wing) is generated exactly because of its a-symmetrical shape. The lift is transformed into a forward directed movement thanks to the working of the keel, which takes me to another question for such a ship.

What does the text means by:"lift is generated when the wind comes from both port and starboard sides." ? Wind blows in only one direction at one particular moment, the movement of the ship also creates wind, but this is not what is meant here.

EJ
18th September, 2013 @ 05:10 am PDT

I suppose it works in much the same way the blade of a Darrieus wind turbine does by using the forward force vector generated by the aerofoil shape. If that is the case, I wonder how much forward force is generated at the bow end when there is a tail wind.

60% saving seems optimistic, but I am no aerodynamicist.

It would be interesting to see if stacking containers in a teardrop shape on a conventional container ship would provide any fuel saving, and if so, would it be enough to compensate for the reduced number of containers carried per voyage. (Of course, the tail of the teardrop could take the form of a wind inflated tapering shape at the stern just big enough to maintain laminar flow.)

Mel Tisdale
18th September, 2013 @ 06:08 am PDT

Really bad idea, unless you have an adjustable ballast that would allow you to lower and raise the ship when storms come but this would take a significant amount of energy to raise a ship as large as this. Still in good weather you could skirt across the ocean quickly and when a storm came you could take on ballast and make the ship significantly more stable then most ships today with a greater ballast. I hope this is their concept.

Matt Fletcher
18th September, 2013 @ 06:55 am PDT

This looks like it would need a huge keel for stability, which would keep it out of most ports.

Jim Cochran
18th September, 2013 @ 07:10 am PDT

well, we're not exactly naval engineers around here, but the idea seems to hold some... wind to it. There's ample wind in the sea, and it can be put to good use, why not?

I'm not sure how the ship (and its cargo) will fare on very rough seas, though. But I guess that's something naval engineers know how to solve :)

Τριαντάφυλλος Καραγιάννης
18th September, 2013 @ 07:42 am PDT

It seems similar (using wind to help power the ship) to Jaques Cousteus ship that has turbo sails on it. It does look cool but one wanders if the wind could top over such a tall ship?

BigGoofyGuy
18th September, 2013 @ 08:15 am PDT

I don't see the wind propulsion working well.

I would expect better than 80% reduction in emissions of pollution over a ship burning Bunker C just by going to burning methane and using a catalytic converter.

Slowburn
18th September, 2013 @ 08:27 am PDT

The site of the 'designers' shows the ship being loaded by trucks. Presumably this is because some bright spark twigged that it will be impossible to load this baby with gantry cranes. Whoops.

They clearly have no understanding of how modern shipping works.

Hats off for having a go, though.

Russ Pinney
18th September, 2013 @ 08:44 am PDT

I see a major problem with this design, unless there is a large counter ballast below the water line. Even so, I can't see this design working anywhere but in very calm seas. Sort of like the problems back the thirties with airship travel.

James J Butler
18th September, 2013 @ 10:41 am PDT

It's not being loaded by trucks. The ship is an auto carrier. Those vehicles are being unloaded.

labjam
18th September, 2013 @ 10:57 am PDT

I'll huff and I'll puff...some things spawn from weird ideas and other things, well they are just weird ideas that fade over time. So many restrictions on a ship like this, stability, loading and unloading, If tacking what about transit time? Time is money and if it takes two months to cross the Pacific, well not a good thing..

equator180
18th September, 2013 @ 12:18 pm PDT

Fundamental errors in the thinking are many, and include the thought that the ship acts like a wing - it will only do so when it obeys all the aerodynamic rules - a wing only generates lift at a positive angle of attack, and only with a persistent flow.

Flow separation and AOA stall kill this idea as the airflow in an aircraft is normalised through speed - i.e. when you accelerate the wing the greater proportion of the flow comes from the velocity, not the wind. If it is the latter then the capacity of the wing to expand the envelope between stall and speed and maximum speed will mean the wing cannot approach the levels of dynamic in the shape of a vessel.

Not only not possible, but dangerously gullible unless the vessel only and always operates to no mare than 15-20 degrees ogg-headwind. Daft ship will be careering all over the oceans looking for thrust...

snave
18th September, 2013 @ 01:58 pm PDT

@EJ. Lift on a wing isn't determined by its asymmetrical shape nearly as much as it is by angle of attack. The air molecules at the wing's surface tend to stick to it (The Coanda Effect) so it is pulled in a curve. The reactionary force (equal and opposite) is what gives the wing its lift. The Bournelli effect (pressure difference between each side of the wing) is minor. That's why planes can fly upside down.

warren52nz
18th September, 2013 @ 04:24 pm PDT

Only good for cargo ships, not cruise liners unless sail transparent at deck levels outward.

Awesome concept

like to see test ship make trip from CA to Hawaii or So Pacific alone,

Then later CA to Japan.

Use those winds for some power vs the age of sail alone.

Stephen N Russell
18th September, 2013 @ 05:33 pm PDT

That shape would be interesting if the vessel could take on enough water to be slightly submerged to ride out storms. Or maybe the deck could be used as a runway. It doesn't look like a cargo vessel and it doesn't look like a vacation type of cruise ship. What is its best use?

Jim Sadler
18th September, 2013 @ 07:40 pm PDT

Cannot imagine how much ballast - or very, very deep keel - needed here. I would think that the added travel time spent looking for the right (or any) winds on some oceans would negate fuel cost savings. Many old sailing stories relate spending a lot of time becalmed.

The Skud
18th September, 2013 @ 07:59 pm PDT

They should have a look at the "Vasa". It was so tall it had the shortest maiden voyage of a military vessel ever, less than one mile. Tipped over before even getting out of the harbor.

The many tons of useless ornamental carvings and a weaponry fitment of 72 guns each capable of firing 24 pound projectiles, plus the high sterncastle made it very top heavy. Only took a little breeze to sink it.

This Vindskip would need lots of ballast and a very good computerized stability control system or it could meet the same fate as the Vasa.

Gregg Eshelman
18th September, 2013 @ 08:28 pm PDT

I imagine a big problem would be the inability to reef the "sail", so you are constantly dealing with a substantial thrust, whether it is helping or twarting your navigation.

Michaelc
18th September, 2013 @ 11:44 pm PDT

April Fools! This thing will never get off the ground!

NDG
19th September, 2013 @ 07:34 am PDT

@EJ

Symmetrical airfoils are quite workable. The airfoils on modern stunt-planes and fighters tend to be very close to symmetrical-- this facilitates inverted flight, and decreases stability, among other things. With a symmetrical airfoil, which way the lift is generated depends purely on the angle of attack.

rocketride
19th September, 2013 @ 09:31 am PDT

Can you add hydrofoils on outriggers for greater speed?

Thomas Aquino
22nd September, 2013 @ 10:07 am PDT

Yes a symmetric airfoil generates plenty of lift. Symmetric air foils are simple and the aerodynamic forces acting on the airfoil are more stable.

The symmetric foil allows for a nearly constant center of pressure which prevents excess twisting moments on the wing. Conversely, an asymmetric airfoil can put significant twisting moments as the center of pressure changes constantly with the angle of attack.

There are many theories of lift and many are wrong but they sure sounded right when we were taught them

I can't believe I flew for so many years with different theories of lift but somehow I managed to live through it despite the theories being proved wrong.

One thing that is SURE is, it is the large difference in pressure between the bottom and the top of a wing that lifts. More accurately it is the large negative pressure on top that generally sucks the wing upward. The pressure below the wing is not much different than atmospheric.

Using the Coanda effect to explain lift is also incorrect.

I think this ship is ingenious but I also doubt its practicality. If I'm proven wrong it only means I get to unlearn some previous notions.

Just like lift!

Dr. Veritas
27th September, 2013 @ 07:41 pm PDT

You guys not watch the America's Cup ?

Check out their wing sails.

What to do in a storm ? Get up on the foils !

icykel
2nd October, 2013 @ 02:21 pm PDT

Symmetric airfoil sections - in fact, all airfoil sections - produce a component of lift that is slightly tipped forward. Nothing new in this - it is the reason that airplanes gliding in for landing have their noses level or even tilted slightly upward, but don't stall and fall out of the sky. It's counter-intuitive and takes some getting used to, but it is a fact. This scheme has to be symmetrical because it needs to get that slight thrust whether the wind comes from the starboard or the port beam. I have my doubts about the practicability of the scheme, because (1) it only works at a fairly narrow range of angles of attack, and (2) may even suffer a penalty when fighting a headwind (not necessarily, though, considering the awful aerodynamics of conventional ships' superstructures), and (3) because of the very short span (and consequent very high span loading) of the "wing" which will give it very high induced drag, possibly cancelling the desired thrust. I assume that model tests will be, or have been made. I hope so, anyway.

piolenc
14th October, 2013 @ 08:39 pm PDT

It has been pointed out that a symmetrical aerofoil CAN work if it is presented at an angle of attack. There's a tiny problem: the wind needs to be at (roughly) a suitable angle to the sail, (which is inconvenient if you don't happen to want to go in that direction)

And there's a B I G problemm, which is that the sail then needs to be at an angle to the direction you want the boat to go.

The "sail" of this ship is permanently locked in the exact direction the boat is pointing; for this idea to work, the boat would have to crab at an angle, partly skidding sideways, and would need a series of rudders below the water to keep it on that track.

Which (along with the stability issues raised by others) makes this clearly a non-starter, almost as silly as the perpetual motion ideas nine year olds are famous for inventing.

Andhrew Throup
19th October, 2013 @ 11:23 pm PDT

While I agree that there are many challenges to this and some of the wording is unclear I hope that a way can be found to make it work. Here are two suggestions. The difficulty is aligning the airfoil shape to make the best use of the available wind. If the floatation were provided by two hulls catamaran style , then the upper works cargo section could be aligned to work the wind while the hulls are on pivots and align with the direction of travel. For docking the 3 parts, line up to be thin.

The other concept is that the aerofoil shaped upper works could have side panels that are adjustable to modify the shape and allow more options for effective energy capture just as a wing modifies it's profile higher angles of attack at landing.

Martin Cooper
9th December, 2013 @ 07:06 am PST

It'll never fly!

Alien
5th July, 2014 @ 08:45 pm PDT
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