Efficient energy at sea: The new age of sail

Wind power used to be the means of propelling ships across the oceans - until the advent of the diesel engine. Now, as oil prices soar, mariners are again looking to the elements. Stephen Castle reports

But not always. As a teenager in his native city of Hamburg, Stefan Wrage had two hobbies: flying kites and sailing. Now, he thinks he has combined those passions effectively enough to transport the world's great shipping fleets back more than a century in time to a new age of sail.

Mr Wrage's sail is actually an elaborate kite to help capture the power of the wind, using the energy to supplement convention forms of power. In trials this year on the waters of the Baltic Sea, he has performed the nautical equivalent of reinventing the wheel. By switching to wind power during favourable conditions, energy costs could be slashed, perhaps by more than half.

The breakthrough from his Hamburg-based firm Skysails could be an idea whose time has come. For centuries, the wind was harnessed to carry man across the oceans. Then came the age of steam followed by the diesel engine, which killed off the great sailing fleets of the past.

But wind power has one big advantage: it is free. And, as the world gets used to paying more and more for oil, the possibility of being able to tap into a source of limitless energy for nothing has caught the imagination.

Mr Wrage hit on his notion of a kite-powered ship at the age of 15. "The idea came after I had experienced the huge power generated by flying my kite," he says, "the next day I went on a dinghy and it was going so slowly. And that raised the question, 'why can't we use the huge power of the wind?' I never understood why this was not possible'".

The same thought has occurred to others too. Historically speaking, previous attempts have been flops. In the 1920s, wind power propelled German rotor ships which operated on a form of cylinder. They failed to catch on.

In the late 1970s, Japan equipped at least five tankers with masts so that the vessels could become wind-assisted in favourable conditions. At that point, at least, greater savings could be made by technology that reduced manpower.

Several efforts have been made to create a modern, high-tech sail that could be fitted to contemporary fleets and turn them into hybrid vessels.

One Danish firm, Knud E Hansen, believes it has produced a product that could bring big cost savings for bulk carriers which sail slowly, particularly on northern routes.

It plans to equip ships with a high tensile steel mast with fibreglass panels fore and aft. Jesper Kanstrup, a senior naval architect with the firm, says that the system "can produce three times more power per square metre than a traditional sail".

He says the application is mainly for "large ships sailing slowly, like bulk carriers or tankers, sailing at about 13 knots. From computer animation studies we know that, it is certainly the case that, in the north Atlantic, it is a good idea that can save a lot of fuel".

There are downsides too, however, because the masts also produce drag. The refitting costs can be high and equipping a ship with masts makes loading and unloading it more difficult as well as taking up valuable cargo space on container ships.

The Skysails system avoids those logistical problems. Like many good inventions, the idea is very simple. Kites of anything between 750 and 5,000 square metres launched from a ship, flying between 100m and 300m above sea level, where wind power can be twice as strong as that which propels conventional sails.

It is operated with a computer autopilot and can be retracted by a winch during poor weather.

Its founder says it can be fitted on any type of ship up to an including the very largest, although the firm will start by equipping a mega-yacht, then move to bigger craft in 2007.

Its fitting costs of between €400,000 and €2.5m (£270,000 and £1.7m) are relatively modest by shipping standards and could be recouped in anything between two and five years depending on usage. And, because of the computer-operated autopilot, there are not many additional manpower costs to consider. "We don't say to people, don't use your diesel," says Mr Wrage, "but if there are good winds, throttle back a little".

Nevertheless, the idea is a challenge to the culture and thinking of an industry used to operating on a single energy source.

Simon Stephens, curator of the ship model collection at the National Maritime Museum, says that, because of the costs of buying shipping, innovations tend to take more time to feed through in the world of navigation. Thus, while hybrid cars are already advanced, there has been less work along the same lines in shipping.

He argues: "They are making headway but design developments in shipping goes at a slower rate than in the car industry.

"It takes time for things to come into operation with ships."

There are now good reasons why wind power seems more attractive now than in the last century. In the days of the great sailing fleet, journeys were completely at the mercy of the elements. Nowadays, modern satellite weather forecasting technology is highly sophisticated, allowing crews to plan around climatic conditions. Courses can be altered daily to take account of changing wind patterns.

The economics of the industry, which was set at a time when oil was relatively cheap, have altered drastically. Fuel used to be a small component of costs, compared to manpower but, with the reduction in crew sizes because of new technology, that equation has changed. Meanwhile, environmental issues have come to the fore, with new rules from the International Maritime Organisation on marine pollution requiring ships to shift to a more expensive low-sulphur fuel.

But the idea has never been an easy one to sell to a well-established global industry that wants as much flexibility and as few potential problems as possible.

"It is difficult to convince owners," says Mr Kanstrup, "first you have to show that you would have a reasonable payback time, and then you have to prove that the system is reliable and that there are not going to be technical problems with the ships." Mr Wrage, who is now 32, admits that, at first, he was seen as something of a crank. He says: "For the first two years, 'nerd' was practically the nicest thing I was called. People thought I was talking bullshit because the idea seemed so crazy.

"But when people start to think about it and start to put positive effort into exploring it, I get positive feedback." He now thinks he can break through into the mainstream and, in terms of the potential savings, says that circumstances will determine the benefits. One factor is the price of oil which he expects to be anything between $40-100 (£20-£50) a barrel in the coming years, or at any event "above the average price in the past decade", Mr Wrage says.

Whatever the price of fuel, he says: "Savings could reach 60 per cent, but each ship is different and it will depend on the amount of usage and the kind of ship. It could be 5 per cent to 10 per cent, it could be 30 per cent. In two to five years it pays back the cost of installation, which is fast for the shipping business when you consider that the life of a ship is 25 years."

Even with that large carrot dangled in front of their noses, those in charge of big fleets remain highly cautious, and one last week described the Skysails notion as a "non-starter for ocean-going vessels".

The main complaint is the fact that it is reliant on favourable winds. Worries also include the fear that, if there were a sudden alteration of course, the wind and the engine would be pushing in the opposite direction, putting a strain on superstructure, making steering more difficult (and using more fuel) and maybe even risking the ship. The practicalities of operating the kite also raise questions, particularly about the risk of it detaching in stormy weather.

Mr Wrage rejects many of the criticisms and points out that, because of its shape, the kite can be used upwind as well as downwind (unlike parachutes which have also been experimented with). He says that the force applied by the kite on the ship is no greater than that of an anchor and, because it is attached to the vessel at the same point, there is no need to put additional strain on the superstructure.

And he believes that the control systems are good enough to harness the maximum energy from the prevailing winds and to winch the kite in during stormy weather. However, he does admit that the launch and retraction of the device has been the most technically challenging aspect of the project and that, "in the very worst scenario" it is possible that a kite could be lost. "You cannot say it will never happen," Mr Wrage says. So seriously is the idea now being taken that he has, so far, raised up to €10m in investment in the project and is being supported by companies in the sector including Germany's Oltmann Gruppe. Environmentalists believe that this is a sign of a growing trend which is part of the psychological impact of recent shocks resulting in the dramatic rise in oil price.

Tom Burke, visiting professor at Imperial and University Colleges, London, argues: "You are going to see, around the world, people thinking, 'there is going to be trouble with energy, let's get smart'. People thinking they are getting ahead of the curve have an unblocking and dynamic effect. Ideas which have been around for some time are going to be picked up.

"You will not see the impact for three or four years but there is a lot of investment and energy efficiency is going higher up the project list. Psychologically, people are thinking a lot more about energy independence."

Mr Wrage puts it another way: "Wind power has been the driving force for shipping for a few thousand years. It is only in the past couple of hundred years that we have used oil-driven engines. When oil gets more expensive it is logical to say, 'wind is cheaper', let's use it again'".

News
John Moore inspired this Coca Cola Christmas advert
people

John Moore starred in Coca Cola and Morrisons adverts

News
people

Top Gear presenter is no stranger to foot-in-mouth controversy

Arts and Entertainment
Imelda Staunton as Dolores Umbridge in the Harry Potter films
books

New essay by JK Rowling went live on Pottermore site this morning

News
Russia Today’s new UK channel began broadcasting yesterday. Discussions so far have included why Britons see Russia as ‘the bad guy’
tv

New UK station Russia Today gives a very bizarre view of Britain

PROMOTED VIDEO
News
ebooksAn unforgettable anthology of contemporary reportage
Sport
A Rutherford Raiders shirt with the PornHub sponsorship
football

Arts and Entertainment
Charlie Sheen said he would
tv

Charlie Sheen could be set to revive his role as a hedonistic womaniser

Life and Style
Jamie Oliver’s version of Jollof rice led thousands of people to post angry comments on his website
food + drink
Arts and Entertainment
glastonbury
News
Apple CEO Timothy Cook
people
News
i100
Arts and Entertainment
Vividly drawn: Timothy Spall in Mike Leigh’s ‘Mr Turner’
film

Review: Mike Leigh's biopic is a rambling, rich character study

Arts and Entertainment
Shelley Duvall stars in Stanley Kubrick's The Shining
film
Arts and Entertainment
Shock of the news: Jake Gyllenhaal in ‘Nightcrawler’
film
News
Mike Tyson has led an appalling and sad life, but are we not a country that gives second chances?
people

Former boxer recalls incident when he was seven years old

Life and Style

Want to ward off (or welcome) trick-or-treaters? Here's how

News
people
Latest stories from i100
Have you tried new the Independent Digital Edition apps?
Independent Dating
and  

By clicking 'Search' you
are agreeing to our
Terms of Use.

iJobs Job Widget
iJobs General

Financial Controller - Media, Hospitality / Events

£50000 - £60000 per annum: Sauce Recruitment: A successful entertainment, even...

Management Accountant

£30000 - £35000 per annum: Sauce Recruitment: A successful events and hospital...

The benefits of Recruitment at SThree...

£18000 - £23000 per annum + Comission: SThree: SThree, International Recruitme...

Trainee Recruitment Consultant

£20000 - £25000 per annum + Uncapped Commission: SThree: Are you looking for a...

Day In a Page

The drugs revolution starts now as MPs agree its high time for change

The drugs revolution starts now as MPs agree its high time for change

Commons debate highlights growing cross-party consensus on softening UK drugs legislation, unchanged for 43 years
The camera is turned on tabloid editors in Richard Peppiatt's 'One Rogue Reporter'

Gotcha! The camera is turned on tabloid editors

Hugh Grant says Richard Peppiatt's 'One Rogue Reporter' documentary will highlight issues raised by Leveson
Fall of the Berlin Wall: It was thanks to Mikhail Gorbachev that this symbol of division fell

Fall of the Berlin Wall

It was thanks to Gorbachev that this symbol of division fell
Halloween 2014: What makes Ouija boards, demon dolls, and evil clowns so frightening?

What makes ouija boards and demon dolls scary?

Ouija boards, demon dolls, evil children and clowns are all classic tropes of horror, and this year’s Halloween releases feature them all. What makes them so frightening, decade after decade?
A safari in modern Britain: Rose Rouse reveals how her four-year tour of Harlesden taught her as much about the UK as it did about NW10

Rose Rouse's safari in modern Britain

Rouse decided to walk and talk with as many different people as possible in her neighbourhood of Harlesden and her experiences have been published in a new book
Welcome to my world of no smell and odd tastes: How a bike accident left one woman living with unwanted food mash-ups

'My world of no smell and odd tastes'

A head injury from a bicycle accident had the surprising effect of robbing Nell Frizzell of two of her senses

Matt Parker is proud of his square roots

The "stand-up mathematician" is using comedy nights to preach maths to big audiences
Paul Scholes column: Beating Manchester City is vital part of life at Manchester United. This is first major test for Luke Shaw, Angel Di Maria and Radamel Falcao – it’s not a game to lose

Paul Scholes column

Beating City is vital part of life at United. This is first major test for Shaw, Di Maria and Falcao – it’s not a game to lose
Frank Warren: Call me an old git, but I just can't see that there's a place for women’s boxing

Frank Warren column

Call me an old git, but I just can't see that there's a place for women’s boxing
Adrian Heath interview: Former Everton striker prepares his Orlando City side for the MLS - and having Kaka in the dressing room

Adrian Heath's American dream...

Former Everton striker prepares his Orlando City side for the MLS - and having Kaka in the dressing room
Simon Hart: Manchester City will rise again but they need to change their attitude

Manchester City will rise again but they need to change their attitude

Manuel Pellegrini’s side are too good to fail and derby allows them to start again, says Simon Hart
Isis in Syria: A general reveals the lack of communication with the US - and his country's awkward relationship with their allies-by-default

A Syrian general speaks

A senior officer of Bashar al-Assad’s regime talks to Robert Fisk about his army’s brutal struggle with Isis, in a dirty war whose challenges include widespread atrocities
‘A bit of a shock...’ Cambridge economist with Glasgow roots becomes Zambia’s acting President

‘A bit of a shock...’ Economist with Glasgow roots becomes Zambia’s acting President

Guy Scott's predecessor, Michael Sata, died in a London hospital this week after a lengthy illness
Fall of the Berlin Wall: History catches up with Erich Honecker - the East German leader who praised the Iron Curtain and claimed it prevented a Third World War

Fall of the Berlin Wall

History catches up with Erich Honecker - the East German leader who praised the Iron Curtain and claimed it prevented a Third World War
How to turn your mobile phone into easy money

Turn your mobile phone into easy money

There are 90 million unused mobiles in the UK, which would be worth £7bn if we cashed them in, says David Crookes