What does SS stand for ships? A history of steamships and ship prefixes

The prefix SS, which stands for steamship or screw steamer, has a long history tied to the age of steam-powered ships. In this extended deep dive, we‘ll explore what SS means, how it came to represent an era of transformative change in ocean travel, and why this iconic designation still resonates with ship enthusiasts today.

The dawn of steamships

Maritime transportation was revolutionized in the 1800s by the harnessing of steam power. Early steam engines were first successfully used for river boats, but eventually pioneering engineers and businessmen gambled on steam to conquer the open ocean.

On April 8th, 1838 the SS Great Western, built by the visionary Isambard Kingdom Brunel, set off from Bristol on her first voyage to New York. She was the first steamship purpose-built for regularly scheduled transatlantic passenger service. The 4 masted giant demonstrated steam‘s potential, cutting the fastest sailing ship journey of the time by more than a third.

The SS prefix that came to designate these novel vessels encapsulated their groundbreaking technology. SS stood for steamship or screw steamer, denoting that billowing steam from boilers drove paddles or propellers. This set them apart from wind powered sailing ships or vessels reliant on human oars.

Here‘s a quick glance at major milestones as steamships rapidly evolved in the 1800s:

• 1807 – The Clermont is credited as the first successful steamboat, running on the Hudson River
• 1819 – SS Savannah crosses Atlantic partially under steam power – first steamship to cross
• 1838 – SS Great Western enters service as the first steamship built for regular Atlantic crossings
• 1840 – RMS Britannia launched for transatlantic British and North American mail service
• 1845 – SS Great Britain pioneers screw propeller design advancing performance
• 1858 – Brunel‘s SS Great Eastern laid down as by far the largest ship yet built

Steam engine design and metallurgy also advanced rapidly. Higher steam pressures and stronger boilers supported bigger engines and allowed ships to carry more coal fuel.

By the 1850s screw propellers had proven superior to paddlewheels. And engineers kept pushing the boundaries of size, with Isambard Brunel capping his career by building the mammoth SS Great Eastern. She remained the longest ship ever built for 4 decades.

Steamship supremacy

By the late 19th century steamships dominated maritime transportation, offering speeds and regular schedules unmatched by sail. Massive ocean liners criss-crossed the Atlantic carrying immigrants to America and mail, cargo and upper-class passengers between continents.

The period from the 1880s to the 1920s is considered the golden era of steamships. Bigger, faster vessels were assisted by huge improvements in naval architecture, materials, wireless communication, navigation aids like gyrocompasses and turbine engine efficiencies.

• 1870s – Compound steam engines cut coal consumption by recycling waste heat
• 1897 – SS Turbinia pioneered steam turbine engines, increasing efficiency and speeds
• 1901 – First Marconi wireless communication between passenger ships and shore
• 1907 – RMS Lusitania captures Blue Riband for fastest Atlantic service

Luxurious express liners competed intensely for prestige and the Blue Riband trophy for the fastest Atlantic crossings. On the North Atlantic, the major British and German liners sporting four funnels were expressly designed with speed and luxury in mind.

The most revolutionary was the RMS Lusitania, briefly the largest and fastest passenger ship when she entered service in 1907. She was the first to incorporate revolutionary new steam turbines as well as electric lights and elevators.

Below are some specifications of the largest North Atlantic passenger liners of this era:

This was the era of giants like Titanic. But as subsequent sections explore, within a few decades the supremacy of steamships would fade.

Why "RMS" and "SS" for Titanic?

The most iconic steamship of all time is undoubtedly RMS Titanic. But it‘s interesting to note that Titanic was inconsistently referred to at the time.

Officially her prefix stood for Royal Mail Ship, denoting her contract to carry mail for the Royal Mail postal service. This status was considered more prestigious than a simple steamship designation.

However, Titanic was very much a steamship in terms of her power plant. She was propelled by two enormous steam engines powering twin propellers.

Titanic also operated alongside her nearly identical sister ship RMS Olympic. The White Star marketing material of the era sometimes referred to the Olympic class liners as the SS Olympic and SS Titanic.

Today it‘s common to see Titanic referred to as either SS or RMS Titanic. SS is now taken as a generic designation rather than specifically indicating steam propulsion.

This fluidity of prefixes could cause confusion, but the public was increasingly able to distinguish ships visually by their distinctive silhouettes.

Steaming towards obsolescence

By the early 20th century potential issues with steamships were becoming apparent. While they dominated transportation, steam plants required huge amounts of dirty coal and manpower to operate.

A typical large passenger liner consumed over 650 tons of coal per day! Getting to coaling stations was a logistic challenge. And feeding boilers and engines required triple expansion engines and large crews.

Even the Titanic, one of the most advanced steamships of her day, required over 170 men just to operate her main steam systems around the clock. Almost 1/3 of the crew was devoted to "black gangs" feeding the furnaces and managing the engines.

In contrast, diesel and turbine oil engines offered major advantages:

• Efficiency – Diesel and turbine oil fuel offered much greater range per ton than steam boilers
• Automation – Oil engines needed far fewer workers to operate at sea
• Reliability -Simplify engine design by removing complex valve gearing
• Supply – Oil fueling stations easier to provision and manage

By the 1930s, virtually all new merchant ship construction was either diesel or turbine driven. The SS prefix gradually faded from use as steamships were superseded.

Even the giant Cunard liners Queen Mary and Queen Elizabeth, while spiritual successors to speedy North Atlantic greyhounds, adopted turbine oil propulsion when entering service in 1936-1940.

The rise of motor ships

As steam faded, prefixes like MV (Motor Vessel) and MS (Motor Ship) designated the new generation of motor driven ships.

The first MV designated ocean liner was Cunard‘s RMS Britannic, converted from steam to diesel power in 1929. She was steadily followed by famous motor ships like:

• MV Bremen – Broke Blue Riband in 1933 with advanced diesel engines and turbine design
• MV Rex – Held Blue Riband in 1933 with unique diesel electric-turbine power
• MV Wilhelm Gustloff – Purpose-built diesel ship, sank 1945 with huge loss of life
• MV Augustus – First American passenger liner driven by diesel in 1952

By the 1950s, virtually all ocean liners, warships and cargo ships had transitioned to diesel or turbine motors. The complex, manpower intensive steamships were now a relic.

This table shows the rapid transition to motor propulsion:

The legacy of steamships and SS

The SS prefix originating in the 19th century steamship era remains an iconic piece of maritime history. It represents a pivotal technological revolution that shrank the world.

It also evokes nostalgia for the elegance and ambition of liners like Titanic. In the late 1800s, travelers described crossing the Atlantic as "entering a new world." Steamships seemed miraculous in conquering time and distance to connect the globe.

Today most people wouldn‘t know that SS specifically indicated steam propulsion on period vessels. Its meaning has evolved into a general representation of historic ocean liners.

When we read of the famed tragic sinking of SS Titanic, that SS invokes cracking pistol shots from the ship‘s funnel announcing departure, frantic stokers shoveling coal into glowing furnaces, and the ship‘s orchestra playing ragtime tunes to keep spirits high.

The prefix survived precisely because it so powerfully encapsulates an exciting transitional period of human engineering and daring. Modern ships may be faster and more efficient, but they lack the adventurous spirit embodied by those innovative steamships.

Conclusion

This extended exploration of the designation SS reveals its roots in the groundbreaking 19th century advent of steam propulsion for ocean travel. It came to represent an era where ever larger and more luxurious steamships competed intensely for supremacy and prestige.

RMS Titanic remains the most famous liner to bear the designation. But by mid 20th century, advances like diesel motors had made elaborate steamships obsolete on the high seas. The SS prefix faded along with the manpower heavy plants that once revolutionized ocean travel and trade.

Today SS invokes nostalgia for that ambitious age of steam travel. The prefix became detached over time from its technical origins to more generically represent historic ocean liners. So while factually imprecise for ships like Titanic, attaching the SS prefix evokes the grandeur, complexity and ultimately tragedy that characterized ambitious vessels driven by steam.