SART researchers at the Institute of Space Systems in Bremen, Germany, have come up with the SpaceLiner concept. This hypersonic jet would be made up of a booster and a passenger stage, which separate after being propelled into the mesophere.
SpaceLiner —
SART researchers at the Institute of Space Systems in Bremen, Germany, have come up with the SpaceLiner concept. This hypersonic jet would be made up of a booster and a passenger stage, which separate after being propelled into the mesophere.
Courtesy of the German Aerospace Center (DLR)
This model shows what the two-stage SpaceLiner would look like before take-off. The concept is the result of 10 years of research, and the team estimate that the jet could reach speeds of Mach 25 -- that's 25 times the speed of sound.
10 years of ongoing research —
This model shows what the two-stage SpaceLiner would look like before take-off. The concept is the result of 10 years of research, and the team estimate that the jet could reach speeds of Mach 25 -- that's 25 times the speed of sound.
Courtesy of the German Aerospace Center (DLR)
After reaching a maximum altitude of about 80 kilometers, the SpaceLiner's passenger stage would commence a gliding descent towards its destination. Although most processes would be fully automated, there would still be two pilots at the helm.
Passenger stage in descent —
After reaching a maximum altitude of about 80 kilometers, the SpaceLiner's passenger stage would commence a gliding descent towards its destination. Although most processes would be fully automated, there would still be two pilots at the helm.
Courtesy of the German Aerospace Center (DLR)
The Skreemr concept design sparked debate recently. It would supposedly travel at speeds as fast as Mach 10, reaching New York from London in 30 minutes.
Skreemr —
The Skreemr concept design sparked debate recently. It would supposedly travel at speeds as fast as Mach 10, reaching New York from London in 30 minutes.
Ray Mattison/Courtesy Charles Bombardier
Earlier this year, a team from Bristol University in England developed technology that could repair cracks on an aircraft in a similar way that human skin heals. The researchers say it could be introduced in five to ten years.
Self-healing planes —
Earlier this year, a team from Bristol University in England developed technology that could repair cracks on an aircraft in a similar way that human skin heals. The researchers say it could be introduced in five to ten years.
MIGUEL MEDINA/AFP/Getty Images
Also in 2015, Errikos Levis of Imperial London College designed a concept for a family of transatlantic seaplanes that could carry up to 2,000 passengers. The plane would feature a blended wing body, and the engine would live on top of the plane.
Transatlantic seaplane —
Also in 2015, Errikos Levis of Imperial London College designed a concept for a family of transatlantic seaplanes that could carry up to 2,000 passengers. The plane would feature a blended wing body, and the engine would live on top of the plane.
Courtesy Errikos Levis/Imperial College London
In 2015, designer and aviation enthusiast Oscar Vinals designed a triple-decker concept plane called the AWWA Progress Eagle, which he imagined carrying up to 800 passengers and running on solar power and hydrogen.
Progress Eagle —
In 2015, designer and aviation enthusiast Oscar Vinals designed a triple-decker concept plane called the AWWA Progress Eagle, which he imagined carrying up to 800 passengers and running on solar power and hydrogen.
Oscar Vinals
Vinals designed the Skywhale in 2014. The imagined aircraft came equipped with self-repairing wings, large windows, a vertical takeoff ability and room for 755 passengers.
Skywhale —
Vinals designed the Skywhale in 2014. The imagined aircraft came equipped with self-repairing wings, large windows, a vertical takeoff ability and room for 755 passengers.
Alejandro Erickson/Oscar Viñal
In 2014 British design company Hybrid Air Vehicles brought airships back in fashion with a design for the Airlander 10, a 92-meter-long airship filled with helium.
Airlander —
In 2014 British design company Hybrid Air Vehicles brought airships back in fashion with a design for the Airlander 10, a 92-meter-long airship filled with helium.
Courtesy Hybrid Air Vehicles
Aircraft manufacturer Airbus has floated the idea of a futuristic plane with a transparent cabin, holographic pop-up gaming displays and seats that change in size and shape to fit each passenger. They've hinted that such a plane could be in the skies by 2050.
Airbus concept plane —
Aircraft manufacturer Airbus has floated the idea of a futuristic plane with a transparent cabin, holographic pop-up gaming displays and seats that change in size and shape to fit each passenger. They've hinted that such a plane could be in the skies by 2050.
Courtesy Airbus
In 2014, Spike Aerospace announced plans for what the world's first supersonic business jet, one capable of breaking the sound barrier, and traveling at Mach 1.8. The S-512 supersonic jet would have no windows (to decrease drag). Instead, the cabin would be lined with screens that could display the landscape outside.
Windowless supersonic jet —
In 2014, Spike Aerospace announced plans for what the world's first supersonic business jet, one capable of breaking the sound barrier, and traveling at Mach 1.8. The S-512 supersonic jet would have no windows (to decrease drag). Instead, the cabin would be lined with screens that could display the landscape outside.
Spike Aerospace
Futuristic planes
CNN  — 

London to Melbourne in 90 minutes? Paris to San Francisco in under an hour?

That’s travel at 25 times the speed of sound – or barely enough time to take in an in-flight movie.

Few areas of aviation generate wilder predictions than hypersonic flight – but a team in Germany might just have cracked it.

Hypersonic means speeds of Mach 5 or over, or more than five times the speed of sound. Supersonic is Mach 1, or the speed of sound.

Since the withdrawal of the Concorde in 2003, commercial aviation has remained purely subsonic, but that could change in the coming decades.

Take new aircraft concepts like the Japanese HYTEX, capable of speeds of Mach 5, or the European Lapcat-II, expected to reach Mach 8.

Then there’s the nascent space tourism industry, with companies such as Virgin Galactic and XCOR Aerospace hoping to take a select few on leisure trips to the edge of space.

Researchers at the German Aerospace Center (DLR) are taking their own approach.

A team has applied space technology principles to propose what is possibly the world’s most advanced hypersonic airliner concept to date.

The SpaceLiner

The result of 10 years of ongoing research by the Space Launcher Systems Analysis (SART) department at the Institute of Space Systems in Bremen, the SpaceLiner is a revolutionary hypersonic spaceplane concept capable of flying some 50 passengers across the globe at speeds of up to 25 times the speed of sound.

It’s based on a two-stage concept, not unlike the Space Shuttle, where both the booster and passenger stages start in an upright configuration.

Propelled by 11 rocket engines during launch (nine on the booster stage and two on the passenger stage) the system accelerates into the mesosphere using traditional cryogenic rocket propulsion.

Once the booster stage is empty, the smaller passenger vehicle separates from the booster stage and continues accelerating, flying autonomously, just like an aircraft – except that it does so while reaching astonishing speed of up to Mach 25.

After reaching a maximum altitude of about 80 kilometers, the passenger stage commences a gliding descent towards its destination.

Not only is the SpaceLiner concept incredibly fast, it’s also environmentally friendly.

It uses liquid oxygen and liquid hydrogen (LOX/LH2) propellants so only water vapour is produced.

Most of the flight processes will be fully automated, but there would still be two pilots to monitor all onboard and flight procedures – and to provide reassurance to passengers.

Re-usability is key

Traveling at Mach 25? Better choose one of the shorter in-flight movies.
Traveling at Mach 25? Better choose one of the shorter in-flight movies.
Courtesy of the German Aerospace Center (DLR)

With performance like this, it’d be possible to go from Europe to Australia in 90 minutes.

The SpaceLiner hopes to capture a slice of the existing very-long-haul premium air travel market, but this will only be possible if costs can be brought down to a reasonable level.

Up until now everything that relates to space travel has been prohibitively expensive, which explains why this field has remained the preserve of a handful of governments and ultra-rich individuals.

SART researcher Dr. Olga Trivailo explains that the high costs are “due to limited technology application and, thus, demand, which underpins low production rates of space systems.”

One of the keys to lowering costs, and a cornerstone of the SpaceLiner project, is re-usability.

The SpaceLiner vehicle is designed to be fully re-usable, from the system’s engines, to the passenger vehicle and the booster stage, which would be able to return independently to the launch site after separating from the passenger stage.

The rocket engines are expected to withstand at least 25 launches, while both stages might last up to 150 cycles.

The DLR engineers have avoided relying on any untested technology.

It’d add too much complexity, risk, and development time to what is already an extremely complex project.

London to New York in 30 minutes?

A laboratory for new ideas

The SpaceLiner’s passenger stage will start off in an upright position, meaning that seating arrangements will need to differ from those of conventional airliners.

During the first 10 minutes of flight, passengers will experience forces of up to 2.5G – 2.5 times their body weight on Earth, or about half the G forces you’d get on a roller coaster.

There’s no need for passengers to undergo special training as they would with space travel, but the advent of hypersonic flight still presents a great opportunity to test new passenger cabin concepts.

Architects and designers have been brought into the SpaceLiner project to help devise the passenger experience of the hypersonic era.

Wealthy investors will be needed to make the concept work.
Wealthy investors will be needed to make the concept work.
Courtesy of the German Aerospace Center (DLR)

The hypersonic flight market

Even if costs can be brought down, hypersonic flight is likely to remain a premium product, at least at the beginning.

The number of potential routes flown by the SpaceLiner would be limited to intercontinental distances of more than 9,000 kilometers, where the time-saving would be most beneficial.

Potential routes could include Australia to Europe, as well as linking destinations in the Far East, Europe, America’s West Coast and the Trans-Pacific market.

The SpaceLiner would need space ports to be strategically located close to main population centers and business hubs in order to capture business traffic, while at the same time being sufficiently removed from densely populated areas in order to minimize noise issues during take-off.

Coastal locations are the most desirable so that the starting phase can occur over water.

SART has already identified several suitable launch sites in Europe, Australia and the U.S. that meet these criteria, with the Netherlands’ north coast being a particular favorite.

How will we fly in 2050?

It will take some time to fly hypersonic

According to SART’s own estimates, SpaceLiner flights are still a few decades away, maybe as much as 30 years.

If it’s ever to become a reality, the SpaceLiner will need the involvement of the aerospace industry as well as investors with deep pockets.

Dr. Trivailo estimates that the SpaceLiner would require an initial investment of 28 to 30 billion euros ($30 to 32 billion) to make it to the prototype stage.

But there’s a lot more to the SpaceLiner than flying passengers faster across continents.

By designing a fully reusable space system for regular passenger traffic, SART researchers hope that their work will make space travel more cost-effective.

If their space hardware went into serial production, costs might be brought down and space travel would be more accessible to more people.

Don’t pack your suitcase just yet, but affordable space tourism could be that little bit closer to reality.

Hypersonic rocket engine could ‘revolutionize’ air travel

Miquel Ros is an aviation blogger. An economist by background, he’s worked for Flightglobal and Bloomberg. He currently covers the airline industry through Allplane.tv and collaborates with luxury travel website Trovel and other online media.