According to RFA's operational director Joern Spurmann, it allows "30 percent more payload to be put into orbit".

Another German firm, Baden-Wuerttemberg based HyImpulse, has also made waves with a 20-second engine test on the Shetland Isles in May, using a candle-wax-based fuel to maximise efficiency.

"Our technology is advanced enough to serve the mini-launcher market," said HyImpulse co-founder Christian Schmierer.

Isar Aerospace, which is run from just outside Munich by three directors in their thirties, is yet to carry out its first engine test, but is the most well-financed of the three.

Backed by investors such as the Swiss bank Lombard Odier, venture capitalists HV Capital and holding company Porsche SE, the startup has amassed more than 150 million euros ($180 million) in funding, and is hoping to launch its "Spectrum" rocket for the first time in 2022.

Satellite taxis

Isar Aerospace predicts that the mini-launcher market will grow to "more than 30 billion euros by 2027, with small and medium-sized satellites making up around a third of it".

Weighing only a few hundred kilograms, these small satellites are tiny compared to the machines of up to 10 tonnes which are sent into orbit by the European Space Agency's Ariane rockets.

"A large rocket is like a long-distance bus which drops all its passengers at the same stop. A micro-launcher works like a taxi, placing the satellites exactly where the client wants them," explained Christian Schmierer of HyImpulse.

According to Isar Aerospace founder Daniel Metzler, the smallest ones will be little more than "boxes of around 10 centimetres, weighing just one kilogram (2.2 pounds) and orbiting the Earth at 28,000 kilometres per hour".

Reducing size and maximising efficiency also means lowering costs.

"In time, we will be able to load 1.3 tonnes of material for five million euros, a price significantly lower than the competition at 3,850 euros per kilo," said RFA.

Henry Ford moment

The three German startups are aiming to eventually assemble a fleet of 20 to 40 partially reusable rockets, guaranteeing dozens of launches per year.

Subcontractors in the automobile industry, many of whom are looking to diversify away from combustion engine vehicles, will provide engine parts for the rockets.

"We want to create a Henry Ford moment for space travel," said Spurmann, in reference to the American industrialist who revolutionised the production of cars in the early 20th century.

Yet Germany is far from the only country eyeing this lucrative market. SpaceX already puts mini-satellites into orbit in collaboration with NASA, while American rival Rocket Lab is among the pioneers of commercial extra-terrestrial flights.

China is also active in the sector, while there are half a dozen serious projects in Europe, including in Spain and the UK.

"The reliability of the different economic models will be a central question in the next three to five years," said Carla Filotico of German space industry consultants SpaceTec.

The "consolidation of the sector" would probably leave some companies by the wayside, she added.

© 2021 AFP

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