Currently reading: Riversimple to commence Beta testing of Rasa hydrogen car
Zero-emission vehicle uses four in-wheel electric motors and promises 250mpg and a 300-mile range; investors are invited to help get the first stage of open development rolling

British car maker Riversimple has announced that it's ready to commence the Beta-testing stage of development for its new hydrogen-powered Rasa and has asked investors to get involved to help kick-start the programme.

The company plans to hold a 12-month trial period during which members of the public will run a Rasa as their own car and help it to iron out any issues before it goes into production.

If funding meets the required amount, a run of 20 Riversimple Rasas could be on British roads later this year in selected areas where suitable infrastructure (such as a hydrogen filling station) is within reach. If this development period is successful, Riversimple plans to produce 3500 Rasas in 2018, offered to drivers through a leasing scheme.

Autocar met Riversimple's founder earlier this year. Read on to find out more.

The car

The two-seat Rasa produces nothing but water from its tailpipe and is capable of an estimated 250mpg and a 300-mile range from just 1.5kg of hydrogen.

The Rasa uses an 8.5kW fuel-cell (equivalent to about 11bhp), which combines hydrogen with oxygen to form water and electricity. The electricity powers four motors that drive each of the car’s wheels, with a combined output of about 443lb ft of torque.

Each of the car’s electric motors works as a generator when the brakes are applied and can recover as much as 70% of kinetic energy during heavy braking. Under normal applications, around 50% is recovered.

The whole drivetrain has just 18 moving parts and is capable of accelerating the car to 60mph in a respectable 10sec. Top speed is limited to 60mph, but Riversimple says the car can comfortably cruise at this speed for long periods.

Riversimple hy web 903

The Rasa weighs just 580kg thanks to its use of a carbon-composite monocoque and aluminium subframes. Weight has been minimised in every avenue, with the monocoque weighing 39kg, the doors weighing 8kg and the fuel-cell itself weighing 19kg. Sustainably sourced carbonfibre-reinforced plastic and glassfibre-reinforced polymer body panels add minimal mass on top.


Read our review

Car review

Toyota claims another first: Europe’s first ‘ownable’ hydrogen car, whether the infrastructure to properly support it is ready for it or not

Back to top

Riversimple founder Hugo Spowers says Colin Chapman and his philosophy for light weight Lotus sports cars served as an inspiration.

Spowers’ background involves racing – his previous ventures include founding and running a business that designed and built racing cars – but environmental concerns spurred a move into creating sustainable cars. The Rasa has, therefore, been built with minimal resource usage in mind.

In total, the Rasa’s well-to-wheel CO2 output (how much CO2 has been produced from the model’s conception to the end of its useful life) equates to about 40g/km. But with rapidly improving drivetrains and refined production methods, Riversimple expects to cut that number in half in the coming years.

Autocar sampled the Rasa from the passenger seat. While our limited time in the car revealed little about its performance, the overall experience was akin to that of a small British sports car. With just two gears – forward and reverse – it’s surprisingly simple to operate, and it pulled and sounded like a typical electric car.

It rode like something suited to track work – that’s to say it was rather harsh over bumps and manhole covers - but Spowers confirmed that the car’s suspension settings were still under development. He said the finished product would be much more forgiving.

Riversimple hy web 908

Back to top

The cabin is surprisingly pleasant; although insulation from the outside world is thin, the low seats, Alcantara-wrapped steering wheel and clutter-free dash give the interior a sports car feel - no doubt influenced by Spowers’ motorsport background.

The business plan

As interesting as the Rasa is, however, it’s Riversimple’s business plan that really sets it apart from other alternatively powered vehicles.

Riversimple will soon produce a run of 20 trial Rasas to be used by individuals later this year in what it calls a beta trial. It believes opening the development phase to people outside the business will help it increase the rate of improvement.

Riversimple will also open source all its findings and development, so other companies can then work to develop the technology. Spowers’ thinking is that having thousands of eyes working on a piece of technology is far better than just a small team. He’s confident Riversimple’s place as development leader will ensure the company’s survival, even if its technology is used elsewhere.

After the beta trial, a full production run of 3500 vehicles is planned for 2018. These cars will be sold under a contract where buyers rent the right to use the vehicle. Although costs are unconfirmed, Riversimple says prices will be reasonable, and will include fuel, insurance and maintenance costs.

"Rather than trying to make money from our customers in the first few years of ownership, our business plan means we make more money by giving the customer the most affordable service we can," explains Spowers. "If the car is cheap to build, efficient and reliable, we make more money and the customer is happier. All parties are working towards a common goal.”

Riversimple hy web 893

Back to top

Spowers says this plan contrasts with those of many major car manufacturers, which want customers to buy more spare parts and to trade their cars in at regular intervals. Riversimple, on the other hand, wants its cars to last at least 15 years.

The first cars will be offered to individuals located in a few currently undisclosed UK cities, where hydrogen filling stations will be built. This plan ensures that a large enough demand will be generated to justify the expense of building a station. It should then spur on the building of more infrastructure in other areas.

In the future, Riversimple wants to combine its rental scheme with car sharing, as it believes the concept will one day become a much more economically and environmentally sustainable source of private transport.

The firm, which is based in Llandrindod, Wales, has recently secured €2 million (£1.6m) worth of funding from the EU. It was involved in Morgan’s hydrogen LIFEcar project of 2008, and features a team of industry experts with backgrounds in Formula 1 and the aerospace industry along with multinational manufacturers.

Join the debate

Add a comment…
Tony Short 7 May 2016

Hydrogen power

I don't understand why the manufacturers are so fixated on hydrogen fuel cells. Would it not be much simpler to to use hydrogen as the fuel for a standard internal combustion engine as demonstrated by BMW a few years ago and Mercedes many years ago? The only reason I can think of is that such engines might still produce oxides of nitrogen. No carbon dioxide, of course, because there's no carbon in the fuel.
superstevie 5 April 2016

I'm going to guess that the

I'm going to guess that the car will never make production, but the tech will get sold on.
xxxx 5 April 2016


I’ll save them the trouble of testing it. To sum it’s ugly, unsellable (other than to deluded Hydrogen fan boys), incredibly slow, I wouldn’t put my family in it as it looks too small to be safe and you’d look a right bunch of knobs if someone saw you in one. As to the cost well you save a lot as you’d never find a convenient hydrogen station to fill up. Plus, compare to a plug-in, it’s un-environmental. Need I say more?