Clip-Air project envisages modular aircraft you can board at a railway station

Clip-Air project envisages mod...
The Clip-Air combines air and rail transport elements
The Clip-Air combines air and rail transport elements
View 7 Images
The flying wing provides propulsion, control and landing gear for the Clip-Air
The flying wing provides propulsion, control and landing gear for the Clip-Air
Sideview of Clip-Air showing the cockpit
Sideview of Clip-Air showing the cockpit
Underview of Clip-Air showing the capsule configuration
Underview of Clip-Air showing the capsule configuration
Clip-Air configured for cargo
Clip-Air configured for cargo
The flying wing's landing gear
The flying wing's landing gear
The capsules can be used to pick up passengers at railway stations
The capsules can be used to pick up passengers at railway stations
The Clip-Air combines air and rail transport elements
The Clip-Air combines air and rail transport elements
View gallery - 7 images

Air travel today is a nightmare of long drives to crowded airports, long queues that move at a snail's pace, and long, boring waits in identical lobbies drinking overpriced coffee. It would be so much easier and less frustrating if catching a plane were like catching a train. If Switzerland’s École Polytechnique Fédérale de Lausanne (EPFL) has its way, its Clip-Air project will one day produce modular aircraft that will allow you to board a plane at a London railway station and disembark in the middle of Rome without ever setting foot in an air terminal.

Under development since 2009, the Clip-Air project aims to merge the speed of air travel with the flexibility of rail transport. Airplanes are specialized vehicles made for particular tasks, so a passenger plane can’t be used as a cargo plane without extensive modification. On the other hand, a train is a collection of modules with a locomotive “module” providing propulsion. Put passenger cars behind a locomotive and you have a passenger train, put goods wagons there and you have a goods train. You can also add specialist cars, such as buffet cars, sleepers, guards vans, tankers, ore carriers, car carriers and many more.

Clip-Air configured for cargo
Clip-Air configured for cargo

Clip-Air does the same thing with airplanes. Instead of a locomotive, it uses a flying wing containing the engines, cockpit, fuel and landing gear. And instead of cars, there are up to three modules or capsules that are self-contained airplane fuselages. The capsules can be mixed and matched to suit the purpose at hand. A plane can carry all cargo or all passengers, first class or coach capsules, or any combination along with specialized versions. Another benefit of Clip-Air is that the capsules also increase capacity for an aircraft of a given size, with three passenger capsules carrying 450 people, yet the plane can still operate from a conventional airport.

EPFL has designed the capsules so that they are 30 m (98 ft) long and weigh 30 tonnes (29.5 tons). The clever bit about this is that it makes the capsules suitable for rail transport, which provides the potential to alter the design of airports and how they’re used. Instead of going to the airport and boarding planes, passengers could go to railway stations and board capsules as easily as a commuter train, which on reaching the airport would be attached to the flying wing, so passengers never need to go inside a terminal. The same principle applies to industry, with freight loading moved to railway yards or factories.

The capsules can be used to pick up passengers at railway stations
The capsules can be used to pick up passengers at railway stations

EPFL claims that this configuration allows for more efficient and flexible fleet management and reduces the likelihood of empty flights. The modular design also provides savings in maintenance, storage and management. In addition, EPFL claims that the design is greener because the Clip-Air can carry as many passengers as three Airbus A320s with only half the engines. It can also be adapted to run on a variety of biofuels or liquid hydrogen thanks to the ability to swap out a regular capsule for the large tanks that hydrogen requires.

Though EPFL is confident about the future of Clip-Air, it admits that the technology has a long way to go before it’s practical.

"We still have to break down several barriers but we do believe that it is worth to work in such a concept, at odds with current aircraft technology and which can have a huge impact on society," says Claudio Leonardi, leader of the Clip-Air project. “The development of the concept requires performing more advanced aerodynamic simulations and testing a six-meters (20 ft) long flying model powered by mini-reactors in order to continue to explore the concept’s flight performance and to demonstrate its overall feasibility.”

A 1.2-m (3.9-ft) model of the Clip-Air plane will be exhibited from June 17 to 19 at the Normandy Aerospace stand at the Paris Air Show. Gizmag will be attending the show and will take a closer look at the concept.

The video below shows an animation of the proposed Clip-Air plane.

Source: EPFL

Clip-Air modular plane

View gallery - 7 images
If they can make this concept work then it is a brilliant idea. Not sure if it would be all that practical for long haul flights (which need more facilities eg catering, etc) but for short haul, eg trans Europe, this might well work, and could take advantage of quieter regional airports (provided they have or can be adapted to be rail served).
I would hope that it wouldn't be used for flying to cities that already have superb high speed rail links, eg London-Paris, London-Brussels, but for longer 'short haul' (if that makes sense) such as, for instance, London-Marbella, where high speed rail is less practical due to distance, and the need to change trains.
I don't see why this couldn't work on the aeronautical side. On the railway side, a lot of prejudice and established practice stands in the way of getting a flight-weight article permitted to operate on rails. At the very least, there will have to be detachable bogies to keep the modules light enough to fly efficiently.
Personally I'd be a little worried about travelling at 30,000ft in a pressurized fuselage that had been exposed to a railway environment, rather than the relative safety and caution of an airport.
I'd also be skeptical that those three little engines could move such a huge beast, given the enormous drag penalty of suspending three separate fuselages under a lifting body wing.
That might work in Europe, but here in "the land of the free" the TSA is going to insist on those long lines and other security theater measures.
I agree with piolenc, I think having it sit on a 'train dolley' would make it lighter since that part would not be lifted when it is hoisted up to the plane. It would make it lighter in weight. In comparison, it is like the containers that they put on specialized rail cars that can have them without having to add the wheels to the container itself.
I think this has a lot of potential. I think it could be a flying hotel for those traveling long distances. It could be the airplane version of 'shipping containers'.
I really like the blended wing design.
I think it could bring more people to train stations even if they are not really riding trains.
Lake House
In my country they have torn up most railways. Railway tie boneyards all over Saskatchewan :(
Airplanes crumple and fall apart under the conditions railroad vehicles normally operate under. So the cargo/passenger compartments will have to be overweight.
If the airline wishes to be able to rapidly convert between passenger and cargo they can buy airliners in a convertible configuration. Configured for cargo they are a little heavy but not as bad as a rail capable fuselage.
The most efficient way to move passengers and mixed cargo is with a hub and spoke flight schedule, which is why you usually have to change planes one or twice on your journey. Overnight delivery services such, as FedEx could not afford to operate without it.
Do you want to get into an airline seat and then go to the airport wait until they load you on the plane then fly to your destination city and then wait to be put on a train then be transported to a train station before you can get up and stretch you legs without a real good excuse? I certainly don’t. Too many people die from sitting in airliner seats already.
It is a stupid idea that has failed before but there is always somebody who thinks "But if I was the one doing it, this time it will work."
Michael Perry
This idea makes less sense than its developers claim. The problem with rail plus air travel or indeed anything plus air travel are the delays as we wait for the plane, crew, and enough passengers to arrive. This doesn't solve that problem. Those in the first passenger module to arrive, for instance, will still have to wait for modules 2 and 3 to arrive and get attached. They'll still have to wait when weather delays the plane.
What it does mean is that those who're crammed into these modules will have to spend a long time in that same cramped and unchanging environment. That they won't like.
Remember, people get very upset over a 30 minute delay on the tarmac. They're going to feel much angrier if that's joined, in the same limited space, to a 2-hour train travel and airport sorting wait, plus a half hour waiting for the plane, plus another half hour waiting for the other modules to arrive and get attached. Add that up, and it's three hours in that module before the plane even takes off. And keep in mind the added hassle of boarding passengers who came directly to the airport. With three modules, two on opposite sides of the plane, boarding won't be easy.
Yes, it's no fun waiting in an airport, where travelers can get up, stretch, go to a less cramped restroom, and even dine at a meal that's likely to be more varied and less inflated in price than that on the plane. But that's still better than being stuck in a train plus plane module the entire time, forced to use its limited services.
The aviation industry needs to do more to deal with all the frustrations and delays of air travel, but this approach is hardly the answer. At best, it might suggest a minor but helpful improvement--the ability to check your luggage through to your air destination from major rail stations. That'd mean less hassle and fewer waits in line.
Years ago, I remember taking a train from Copenhagen to Stockholm. Those who ran the train must have thought themselves clever by having my train load onto the ferry for the trip. Personally, I was disappointed. I'd have rather have exited the train with my luggage, ridden the ferry, and boarded another train, with all the movement and change that entailed. Spending that entire trip in one module/train car was a bore.
Walt Barker
I can't see how the the join between the undercarriage and the wings can be made string enough in this configuration. Also, how can you ensure that the wight of the two under-wing modules are the same weight given potentially different cargoes?
You would also need to know the weight of every module before fueling the aircraft.
Bob Flint
It looks like it could do to what has already happened with shipping in containers, general cargo very feasible simple cylindrical containers.
But human transportation involves far more complex issues, security, sustenance, handling logistics, etc...
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