Are Modern Ships Slower Than Sailing Ships? Probably not.

Sovereign of the Seas

In 2010, the headline read,  Modern cargo ships slow to the speed of the sailing clippers. The article was subtitled, “Container ships are taking longer to cross the oceans than the Cutty Sark did as owners adopt ‘super-slow steaming’ to cut back on fuel consumption.

“The world’s largest cargo ships are travelling at lower speeds today than sailing clippers such as the Cutty Sark did more than 130 years ago. 

“A combination of the recession and growing awareness in the shipping industry about climate change emissions encouraged many ship owners to adopt “slow steaming” to save fuel two years ago. This lowered speeds from the standard 25 knots to 20 knots, but many major companies have now taken this a stage further by adopting “super-slow steaming” at speeds of 12 knots (about 14mph).

“Travel times between the US and China, or between Australia and Europe, are now comparable to those of the great age of sail in the 19th century. American clippers reached 14 to 17 knots in the 1850s, with the fastest recording speeds of 22 knots or more.”

Similar stories were reported via various news outlets and blogs. Earlier this month in an article about rate wars among container lines, the author made the statement, “Just to put that into context: the tea clippers of the 19th century normally averaged around 16 knots. Shipping is now officially slower than in the age of sail.

This is all really interesting, but is it true?   Unfortunately, not really.

What is true is that the clipper ships and even the more full-bodied windjammers that came after them could make some very impressive passages in fair winds.   The extreme clipper Sovereign of the Seas designed and built by Donald McKay was indeed recorded sailing at 22 knots, which given the length of the ship translates into a Speed/Length ratio (knots divided by the square root of the waterline length in feet) of around 1.5, which is very fast indeed.   The Cutty Sark was also a very fast ship.  She once sailed 2,163 nautical miles in six days, for an average speed of just over 15 knots.

Nevertheless, the Sovereign of the Seas, the Cutty Sark and other fast sailing ships did not average such speeds.  The Cutty Sark set a record for a passage from Plymouth to Sydney of 72 days, when a fast passage was considered to be anything around 100 days.   Even on the record-setting voyage, however, the Cutty Sark actually only averaged around 8 knots. The ships which made “fast passages” of 100 days averaged around 5 knots.  The Flying Cloud on her record-setting voyage between New York and San Francisco of 89 days, likewise averaged around 7.5 knots.

The reason that average speeds of so many clipper ships were often low had to do with the doldrums, the regions of light air just South of the Equator. Even the fastest sailing ships are slow when the wind is light or non-existent.  But what of ships that did not have to traverse the light air of the doldrums?  The fastest passage ever recorded by a sailing ship between New York and Liverpool was made by the clipper Red Jacket in 13 days, 1 hour and 25 minutes.   During the voyage, she reached speeds of over 17 knots. Nevertheless, her average speed was around 10.5 knots.

These are the record speeds set by the fastest sailing ships.  It is probably fair to say that most sailing ships in the 19th and early 20th centuries averaged between 5 – 8 knots on average depending on the size of the ship, the route and the weather.  There are nothing wrong with these speeds but they are not comparable with container ships, even those slow steaming at 12 knots.

But are container ships the wrong ships to be comparing to sailing ships?  Perhaps modern bulker carriers should be compared to the windjammers, which were also designed to carry bulk cargoes.  Modern bulk carriers are indeed traveling at close to sailing ship speeds.  Panamax bulk carriers, for example, are currently traveling at speeds of 8-9 knots.  A modern sailing bulk carrier with auxiliary engines to move through regions of light air, might not be such a sluggard as compared to her motorized competition.

It is also interesting to look at the windjammers of the early 20th century. At 3,000 – 8,000 dead-weight tonnes, they were among the largest ships of their day and were designed specifically to carry bulk cargo and to sail in the windier passages below the capes. These days, similar bulk carriers are referred to as “Capesize” and are typically larger, sometimes much larger, than 150,000 dead-weight tonnes.

Wouldn’t it be amazing to see a new generation of commercial Capesize sailing ships return to the seas, twenty times larger by cargo capacity, than the largest of the old windjammers?  The winds of the Southern Ocean have not gone away, even if the large sailing ships have largely disappeared.  As fossil fuels grow ever more expensive and environmentally damaging, there is no reason why the energy that once drove the clippers and the windjammers may again power a new generation of mighty sailing ships.  That would indeed be a sight to behold.

Thanks to Alaric Bond for contributing to this post.

 

Comments

Are Modern Ships Slower Than Sailing Ships? Probably not. — 7 Comments

  1. yes yes yes!
    bring back sailing vessels, bring back the sailing and shiphandling skills and the team working experience back to our young people to pass onto future generations. Bring back shipbuilding, reforest our wastelands.
    And leave the Bayonne Bridge alone, dammit.

    We’re slow steaming products in that we might have to one day make ourselves or do without.

  2. Thanks Rick, another great contribution to the discussion. The comparison with modern bulk carriers is an important one and this will be one sector where sail/cargo will be coming back into the mix in the next couple of years. The issue of just-in-time delivery is far less important where bulk cargoes are replenishing stockpiles of basic commodities.

    Keep up the great work

    Gavin

    Greenheart – join the Maiden Voyage http://igg.me/p/119777?a=594913

  3. While even graceful clippers did not reach impressive average speeds, we can still understand that they were not hopelessly slow. The last big windjammers were able to carry grain from Australia to europe somewhat reasonably.

    The grain race was an example of trade based on time. They were loaded in Australia after the local harvest time and unloaded in Europe before the growing season. As far as I have understood, the current seafaring planned to be efficient in all possible ways: fast, big loads and small crews. There is no reason why a modern sailing ship could not carry containers. While they are not particularly fast, they can still sail on timetable. They are not using expensive fuel and they do not need excessive crews. They can be constructed of either relative inexpensive materials as steel or, if speed is needed, of high tech composites. Even a modern rig is relatively simple apparatus compared with a diesel engine. The rig demands maintenance but there are only slow moving parts and no heat.

    Thus: a sailing ship is a relatively simple and inexpensive vehicle. If crew costs are moderate, it is not a big problem if it is not fast. It is a floating storage able to delivery where and when needed.

    I think, if the seafaring as a trade is seen as a part the total worldwide trade with its seasonal changes there could be still use for the slow sailing ships. Moreover, if the cargo is something that can be transported almost as masses but what actually is not just bulk material, the trade is – how should I say – fair. Let’s take, for example, clothes. Fashion is a big business and, more over, clothes are not everlasting. New dresses and jeans are needed even by moderate consumer. Changes of the fashion can be foretold. If I understood this correctly, sailing ship could carry summer dresses for girls. They could be loaded during early winter time in Asia and slowly transported to Northern Europe and unloaded during the spring. I’d say that the first sailing dresses would be profitable enough to pay the first sailing container ships. Ok, I was a bit brave, but people love sailing ships and they love eco ideology. Girls would surely buy dresses with a classic and/or modern sailing ship images and a bit of maritime romantic.

    Finally: a modern sailing ship will be a good tool for a global trade, at least when the businessmen stop fussing nervously and at least try to think further than the next quartal.

  4. I agree completely. The energy of the wind could once again help propel bulk carriers around the globe. I think there is a definite future for large commercial sail or sail-assisted ships. They will not, however, travel faster than container ships.

  5. Good article, thanks. Seems to me that a modern design – with a backup motor for the doldrums as you point out, could perhaps get a bit faster average than 8 to 10 knots of the fastest commercial sailing ships of the late 1800’s. It is interesting to note that speeds of the fastest modern catamarans are quite fast indeed. Could a sailing hybrid of some sort match the slow steaming container ships today? 12 knots seems like a possibility, though I’d agree the top speed of 25 knots seems unlikely. Given fuel cost though, not many container lines want to run their ships at that speed…

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