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Esa selects Ariane 6 basic design Esa selects Ariane 6 basic design
(about 2 hours later)
The basic design for Europe's next generation rocket, the Ariane 6, has been selected.The basic design for Europe's next generation rocket, the Ariane 6, has been selected.
It will be powered by two solid-fuelled lower stages and incorporate the liquid-fuelled upper-stage currently being developed as an upgrade for the existing Ariane 5 vehicle.It will be powered by two solid-fuelled lower stages and incorporate the liquid-fuelled upper-stage currently being developed as an upgrade for the existing Ariane 5 vehicle.
The concept was chosen following six months of trade-off studies.The concept was chosen following six months of trade-off studies.
Member states of the European Space Agency approved Ariane 6 development at a ministerial council last November.Member states of the European Space Agency approved Ariane 6 development at a ministerial council last November.
Esa governments expect the new launcher to enter service at the start of the next decade. Esa governments expect the new launcher to enter service at the Kourou spaceport in French Guiana at the start of the next decade.
The 6 will have less lifting capacity than the five - some 3-6.5 tonnes to the high orbits occupied by telecoms satellites, versus the 11.5 tonnes the 5 will have after its upgrade.The 6 will have less lifting capacity than the five - some 3-6.5 tonnes to the high orbits occupied by telecoms satellites, versus the 11.5 tonnes the 5 will have after its upgrade.
But the 6 will launch just one spacecraft at a time, not the two routinely orbited by the 5 now.But the 6 will launch just one spacecraft at a time, not the two routinely orbited by the 5 now.
Also, the primary driver to a new configuration is the desire to reduce costs of manufacture and operation. Also, the primary driver for a new configuration is the desire to reduce costs of manufacture and operation.
Solid v liquid
Ariane 5, although remarkably reliable and successful, is priced above its competition.Ariane 5, although remarkably reliable and successful, is priced above its competition.
Ministers fear the vehicle's current market dominance will be eroded over time unless a cheaper approach is adopted.Ministers fear the vehicle's current market dominance will be eroded over time unless a cheaper approach is adopted.
The goal is to try produce and launch a rocket for no more than about 70m euros (£60m/£90m).The goal is to try produce and launch a rocket for no more than about 70m euros (£60m/£90m).
The 6 hopes to achieve this by slimming down the production consortium, which is spread across the continent, and by including fewer, less complex components in the build itself. This would be big challenge, said Alain Charmeau, the CEO of Astrium Space Transportation, which leads the Ariane industrial consortium.
"Astrium now has to capture the ball that has been sent to us today by the agency," he told BBC News.
"We will have to make Ariane 6 a very competitive launcher. It's really a complete change in Europe. It's the first time ever that we will try to develop a rocket thinking about production price and not just performance."
The 6 hopes to achieve economies by slimming down the production consortium, which is spread across the continent, and by including fewer, less complex components in the build itself.
The baseline configuration is what is termed "PPH", where the "P" stands for "poudre" (or "powder" in English) to indicate solid propulsion, and where "H" stands for "hydrogen", to indicate the use of super-chilled liquid propellants.The baseline configuration is what is termed "PPH", where the "P" stands for "poudre" (or "powder" in English) to indicate solid propulsion, and where "H" stands for "hydrogen", to indicate the use of super-chilled liquid propellants.
In the 6, the first stage will have a line of three motors, each loaded with 135 tonnes of solid propellant, to lift the vehicle and its payload off the pad.In the 6, the first stage will have a line of three motors, each loaded with 135 tonnes of solid propellant, to lift the vehicle and its payload off the pad.
The in-line trio of motors will burn for a few minutes before separating and falling away. A second solid stage will then ignite and lift what remains of the vehicle into space.The in-line trio of motors will burn for a few minutes before separating and falling away. A second solid stage will then ignite and lift what remains of the vehicle into space.
This too will separate once exhausted, to allow the liquid-fuelled Vinci upper-stage to complete the task of placing the satellite in its final intended orbit.This too will separate once exhausted, to allow the liquid-fuelled Vinci upper-stage to complete the task of placing the satellite in its final intended orbit.
"The second stage will have a booster that is very similar to the ones on the first stage - not exactly, because the second stage will have to ignite out of the atmosphere and so will have to be adapted a little bit," explained Mr Charmeau.
"But there are advantages in having very similar configurations on the boosters of the first and second stage. And there is also the simplicity of operations in Kourou to prepare the launcher."
Leading position
Unlike the current Ariane 5 upper-stage, Vinci will bring itself out of the sky after the mission to limit the amount of junk circling the Earth.Unlike the current Ariane 5 upper-stage, Vinci will bring itself out of the sky after the mission to limit the amount of junk circling the Earth.
The clam-shell fairing which protects the payload during the early phases of the ascent will have a diameter of 5.4m - the same as Ariane 5.The clam-shell fairing which protects the payload during the early phases of the ascent will have a diameter of 5.4m - the same as Ariane 5.
Esa says the Ariane 6 will build on the advances made by European industry in recent years, and will benefit from synergies with its newly introduced Vega rocket.Esa says the Ariane 6 will build on the advances made by European industry in recent years, and will benefit from synergies with its newly introduced Vega rocket.
This is much smaller than Ariane but uses a lot of solids knowhow, and is manufactured with composite techniques the 6 would hope to copy.This is much smaller than Ariane but uses a lot of solids knowhow, and is manufactured with composite techniques the 6 would hope to copy.
Ariane 5 was introduced in 1996. After some early failures it has become the main means by which commercial telecoms satellites - the platforms that relay TV, phone and internet traffic - get into orbit.Ariane 5 was introduced in 1996. After some early failures it has become the main means by which commercial telecoms satellites - the platforms that relay TV, phone and internet traffic - get into orbit.
Flying out of its Kourou base in French Guiana, the rocket also lifts the ATV space truck, the largest cargo vessel supplying the International Space Station. The rocket also lifts the ATV space truck, the largest cargo vessel supplying the International Space Station.
And in 2018, Ariane 5 is scheduled to launch the James Webb Space Telescope, the $10bn (£7bn/8bn euros) successor to the Hubble observatory.And in 2018, Ariane 5 is scheduled to launch the James Webb Space Telescope, the $10bn (£7bn/8bn euros) successor to the Hubble observatory.
A site at Kourou for the 6's new pad has already been identified.A site at Kourou for the 6's new pad has already been identified.
European industry has about a year to fill out the Ariane 6 design and likely workshare before the project enters its next major review.
Jonathan.Amos-INTERNET@bbc.co.uk and follow me on Twitter: @BBCAmosJonathan.Amos-INTERNET@bbc.co.uk and follow me on Twitter: @BBCAmos