Balloon launcher Zero2Infinity Sets Its Sights to the Stars

Clearly, the sky is not the limit for balloon launcher Zero2Infinity. Based in Barcelona, Spain, the company announced this week their plans to launch payloads to orbit using a balloon launch system. The Rockoon is a portmanteau, as Lewis Carroll would have said: the blend of the words rocket and balloon.

The launch system announced by the company is called Bloostar. The Rockoon system begins with a balloon launch to stratospheric altitudes followed by the igniting of a 3 stage rocket to achieve orbit. The Rockoon concept is not new. Dr. James Van Allen with support from the US Navy developed and launched the first Rockoons in 1949. Those were just sounding rockets, Bloostar will take payloads to low-earth orbit and potentially beyond.

The Zero2Infinity Bloostar launch vehicle. Three stages will use a set of liquid fuel engines clustered as concentric toroids. (Photo Credit: 0II00)
The Zero2Infinity Bloostar launch vehicle. Three stages will use a set of liquid fuel engines clustered as concentric toroids. (Photo Credit: 0II00)

The advantage of rocket launch from a balloon is that it takes the Earth’s atmosphere out as a factor in design and as a impediment to reaching orbit. The first phase of the Bloostar system takes out 99% of the Earth’s atmosphere by reaching an altitude of over 20 km (>65,000 feet). Aerodynamics is not a factor so the stages are built out rather than up. The stages of the Bloostar design are a set of concentric rings which are sequentially expended as it ascends to orbit.

Zero2Infinity is developing a liquid fuel engine that they emphasize is environmentally friendly. The first stage firing of Bloostar will last 160 seconds, reach 250 km of altitude and an inertial speed of 3.7 km/s. This is about half the velocity necessary for reach a stable low earth orbit. The second stage will fire for 230 seconds and achieve an altitude of 530 km with velocity of 5.4 km/s. The 3rd and final stage motor will fire at least twice with a coast period to achieve the final orbit. Zero2Infinity states that their Bloostar system will be capable of placing a 75kg (165 lbs) payload into a 600 km (372 mi) sun-synchronous orbit. In contrast, the International Space Station orbits at 420 km (260 mi) altitude.

The Bloostar launch phases. Zero2Infinity intends to de-orbit the final stage to minimize their contribution to the growing debris field in low-earth orbit. Their plans are to launch from a ship at sea. (Photo Credit: 0II00)
The Bloostar launch phases. Zero2Infinity intends to de-orbit the final stage to minimize their contribution to the growing debris field in low-earth orbit. Their plans are to launch from a ship at sea. (Photo Credit: 0II00)

For the developing cubesat space industry, a 75 kg payload to orbit is huge. A single cubesat 10x10x10 cm (1U) will typically weigh about 1 kg so Bloostar would be capable of launching literally a constellation of cubesats or in the other extreme, a single micro-satellite with potentially its own propulsion system to go beyond low-earth orbit.

The Rockoon concept is not unlike what Scaled Composites undertakes with a plane and rocket. Their Whiteknight planes lift the SpaceShips to 50,000 feet for takeoff whereas the Zero2Infinity balloon will loft Bloostar to 65,000 feet or higher. The increased altitude of the balloon launch reduces the atmospheric density to half of what it is at 50,000 feet and altogether about 8% of the density at sea level.

The act of building and launching a stratospheric balloon to 30 km (100,000 feet) altitude with >100 kg instrument payloads is a considerable accomplishment. This is just not the releasing of a balloon but involves plenty of logistics and telecommunications with instrumentation and also the returning of payloads safely to Earth. This is clearly half of what is necessary to reach orbit.

Bloostar is blazing new ground in Spain. The ground tests of their liquid fuel rocket engine are the first of its kinds in the country. Zero2Infinity began launching balloons in 2009. The founder and CEO, Jose Mariano Lopez-Urdiales is an aeronautical engineer educated in Spain with R&D experience involving ESA, MIT and Boeing. He has speerheaded organizations and activities in his native Spain. In 2002 he presented to the World Space Congress in Houston, the paper “The Role of Balloons in the Future Development of Space Tourism”.


Zero2Infinity Press Release

Bloostar Launch Cycle


High-Flying Balloon Dispute Follows ‘World View’ Announcement

The newly announced World View balloon flight concept shares a number of “striking” similarities to an older proposal for ‘near-space flight experience’ balloon rides, according to the head of the zero2infinity Inbloon project.

Both concepts are competing in the nascent high-altitude balloon market, which would see these craft fly high in the stratosphere with paying clients and/or payloads on board. Some of them would be paying tourists to look at the view, while others would be institutions looking to get above most of the Earth’s atmosphere for scientific and other purposes.

The groundwork for zero2infinity’s Inbloon has been in the works since about 2002, founder Jose Mariano Lopez Urdiales said. So far, the Spanish company has run three test flights with micro versions of its balloon; the last one was in September. A ride high in the atmosphere would (when it happens) cost the equivalent of $150,000 (110,000 Euros).

World View — backed by Arizona’s Paragon Space Development Corp., which is involved in several startup space projects — announced in late October that it would offer rides to the high atmosphere for $75,000 each. Few details were provided, but Paragon president Jane Poynter told Universe Today that more announcements will come. She added that the company has been thinking about this kind of work seriously for at least a decade.

The companies were in talks for Paragon to provide life support systems for Inbloon, Urdiales said, but Paragon decided to go its own route. The World View announcement came shortly after Urdiales was told of Paragon’s decision, he added.

“We were speaking to them for a couple of years. They learned about our business and what we were doing,” Urdiales said in late October.

“A month ago or so, they said ‘We’re not going to be able to supply you. We don’t think we’re going to be able to export this to Spain.’ And then we said, ‘Fine, we’re talking to other suppliers’ … and then they launched this thing. The commonalities are striking.”

As examples, Urdiales said a lot of the marketing language was similar and that the artists’ concepts of the balloon designs for the two companies also appeared to be about the same. He added, however, that he is not planning to pursue any formal action because he would rather focus on running safe flights. The first human-rated Inbloon flight is expected in 2014, he said.

“The hard part is getting the investment, and doing the flight. Both things are pretty hard, and require a level of integrity. Otherwise the tests don’t work and you break something and you [could] kill people.”

World View told Universe Today that Paragon has been pursuing this idea independently for years, long before they heard of Urdiales’ plans. The company did not comment on Urdiales’ claims about previous business talks.

World View Experience.mp4 from World View on Vimeo.

“Let me start by emphasizing that we are not duplicating anyone’s plans. The World View concept has been an interest of ours for many years,” Paragon’s Poynter told Universe Today in an e-mail.

“It is worth mentioning, I think, that the idea of human flight using high altitude balloons is not a recent development. In fact, the origins of this idea date back to the 1950s with the work of Otto Winzen and others.  As for our own origins, [co-founder] Taber [MacCallum] went to high-altitude balloon launches as a child, as his father is an astrophysicist and was studying gamma-ray astronomy using high-altitude balloon launches of telescopes.

“That experience translated,” she added, “later in life, to Paragon’s work on a commercial airship project a decade ago for tourism and cargo. We began developing World View long before we heard about Jose and his initiative. In fact, we’ve been looking at commercial uses of lighter-than-air craft for a long time.”

The URL for World View,, was registered Aug. 24, 2013, according to public domain records. Inbloon’s URL,, was registered May 6, 2009.