Ariane 6

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Ariane 6
Ariane 62 and 64.svg
Illustration of the two Ariane 6 variants planned, A62 (left) and A64 (right)
Function Medium-heavy launch vehicle
Manufacturer Airbus Safran Launchers
Project cost over € 4 billion[1](2014 est.)
Cost per launch € 90 million (Ariane 64), 75 million (Ariane 62)[2] (2014 est.)
Size
Height 70 m (230 ft)
Diameter 4.6 m (15 ft)
Mass 500,000–800,000 kg (1,100,000–1,800,000 lb)
Stages 2
Capacity
Payload to
GTO
A62: 5,000 kg (11,000 lb)
A64: 11,000 kg (24,000 lb) or 10,000 kg (22,000 lb) with dual payload
Associated rockets
Family Ariane
Launch history
Status In Development
Launch sites Guiana Space Centre

Ariane 6 is a launch vehicle under development by the European Space Agency (ESA), with a first test flight scheduled for 2020.[3] If development is completed, it will become the newest member in the Ariane launch vehicle family. The final design was selected by the ESA ministerial-level meeting in December 2014,[1] favoring a liquid-fueled core with large solid rocket boosters over the initial solid-fuel rocket design.[4]


Description[edit]

Ariane 6 will come in two variants.

  • Ariane 62, with two P120 solid boosters, will weigh around 500 tonnes (1,100,000 lb) at liftoff and is intended mainly for government and scientific missions.[5] It will be capable of launching up to 5,000 kg (11,000 lb) into GTO.
  • Ariane 64, with four P120 boosters, will have a liftoff weight of around 800 tonnes (1,800,000 lb) and is intended for commercial dual-satellite launches of up to 10,500 kg (23,100 lb) to GTO.[6][5]

Ariane 6 will be made up of three major structural and propellant-carrying components.

First stage[edit]

The Ariane 6 first stage will be powered by a single Vulcain 2 engine burning liquid hydrogen (LH2) and liquid oxygen (LOX). It will be 4.6 m (15 ft) in diameter and contain approximately 149 tonnes (328,000 lb) of propellant.[7]

P120 solid rocket boosters[edit]

Additional thrust for the first stage will be provided by either two or four P120 Solid rocket boosters. These boosters will each contain approximately 120 tonnes (260,000 lb) propellant and will deliver up to 3,500 kN (790,000 lbf) thrust. Additionally, the P120 is intended to be used on an upgraded Vega launcher.[6]

Upper stage[edit]

The upper stage, also 4.6 m (15 ft) in diameter, will be powered by a Vinci engine providing 180 kN (40,000 lbf) thrust. It will contain approximately 30 tonnes (66,000 lb) LH2 and LOX propellant.[6]

Development history[edit]

Ariane 6 PPH[edit]

Ariane 6 PPH cutaway drawing

Following detailed definition studies in 2012,[8] the ESA announced the selection of the "PPH" configuration for Ariane 6 in July 2013. This design would be composed of three P135 solid rocket motors as a first stage, a single P135 motor as a second stage, and a third stage powered by the Vinci cryogenic engine burning LH2 and LOX. It would be capable of launching up to 6,500 kg (14,300 lb) to GTO,[9] with a first flight projected to be as early as 2021–22.[10] Development was projected to cost €4 billion as of May 2013.[11] A 2014 study concluded that development cost could be reduced to about 3 billion Euros by limiting contractors to five countries.[12]

While the Ariane 5 typically launches one large and one medium satellite at a time, the PPH proposal for Ariane 6 was intended for single payloads, with an early-2014 price estimate of approximately US$95 million per launch.[13] The SpaceX Falcon 9 and the Chinese Long March 3B both launch smaller payloads but at lower prices, approximately US$57 million and US$72 million respectively as of early 2014, with the Falcon 9 launch of a midsize satellite competitive with the cost of the lower slot of a dual payload Ariane 5.[13] For lightweight all-electric satellites, Arianespace intended to use the restartable Vinci engine to deliver the satellites closer to their operational orbit than the Falcon 9, significantly reducing the time required (several months for an all-electric satellite from a standard GTO) to transfer to geostationary orbit.[13]

Ariane 6.1 and Ariane 6.2[edit]

In June 2014 Airbus and Safran surprised the ESA by announcing a counter proposal for the Ariane 6. They also announced a 50/50 joint venture to develop the rocket. This joint venture would also involve buying out the French government's (CNES's) interest in Arianespace.[14][15]

This proposed launch system would come in two variants, the Ariane 6.1 and the Ariane 6.2.[16] While both would use a cryogenic main stage powered by a Vulcain 2 engine and two P145 solid boosters, the Ariane 6.1 would feature a cryogenic upper stage powered by the Vinci engine and boost up to 8,500 kg (18,700 lb) to GTO, while the Ariane 6.2 would use a lower-cost hypergolic upper stage powered by the Aestus engine. The Ariane 6.1 would have the ability to launch two electrically powered satellites at once, while the Ariane 6.2 was intended mostly for government payloads.

French newspaper La Tribune questioned if Airbus Space Systems could match promised costs for their Ariane 6 proposal, and whether Airbus and Safran Group could be trusted when they were found to be responsible for a failure of Ariane 5 flight 517 in 2002 and a more recent 2013 failure of the M51 ballistic missile.[4] The companies were also criticized for being unwilling to take the risks of development and asking for higher initial funding than originally planned to start development - €2.6 billion instead of €2.3 billion. Proposed launch prices of €85 million for Ariane 6.1 and €69 million for Ariane 6.2 were also deemed too high by the La Tribune in comparison to SpaceX[17] During the meeting of EU ministers in Geneva on 7 June 2014 these prices were deemed too high and no agreement with manufacturers was reached.[18]

Ariane 62 and Ariane 64[edit]

Following criticism of the Ariane 6 PPH design, France unveiled a revised Ariane 6 proposal in September 2014.[19] This launcher would use a cryogenic main stage powered by the Vulcain 2 and upper stage powered by the Vinci, but vary the number of solid boosters. With 2 P120 boosters, Ariane 6 would launch up to 5,000 kg (11,000 lb) to GTO at a cost of € 75 million. With 4 boosters, Ariane 6 would be able to launch two satellites totaling 11,000 kg (24,000 lb) at a cost of € 90 million.[20]

This proposal, unlike Ariane 6 PPH, offered a scalable launcher while retaining Ariane 5's dual-launch capability. The proposition also included simplification of the industrial and institutional organization along with a better and cheaper version of the Vulcain 2 engine for the main stage.[19][20] Although Ariane 6 was projected to have "lower estimated recurring production costs" it was projected to have "a higher overall development cost owing to the need for a new, Ariane 6-dedicated, launch pad."[21]

The Italian, French and German space ministers met on 23 September 2014 in order to plan strategy and assess the possibility for agreement on funding for the Ariane 5 successor,[22] and in December 2014 the ESA selected the Ariane 62 and Ariane 64 for development and funding.[1]

Future developments[edit]

CNES began studies in 2010[23] on an alternative, reusable first stage for Ariane 6, using a mix of liquid oxygen and liquid methane rather than hydrogen in the current Ariane 6 first-stage design. Methane-powered core would use one or more engines, matching capabilities of Ariane 64 with only two boosters instead of four. Economic feasibility of reusing an entire stage however remains in question. In late 90s and early 00s CNES along with Russia concluded studies indicating that reusing the first stage was an economic nonsense as manufacturing of ten copies a year was cheaper and more feasible than recovery, refurbishment and loss of performance caused by reusability.[24]

Main article: Adeline (rocket)

In June 2015, Airbus Defence and Space announced that development of Adeline, a partially reusable first stage, would become operational between 2025 and 2030, and that it would be developed as a subsequent first stage for Ariane 6. Rather than developing a way to reuse an entire first stage (like SpaceX), Airbus proposed a system where only high-value parts would be safely returned using a winged module at the bottom of the rocket stack.[23]

Funding[edit]

The Ariane 6 is being developed in a public-private partnership with the majority of the funding coming from various ESA government sources—€2.815 billion—while €400 million is reported to be "industry's share".[25]

First Ariane 6 launch contract was signed on 25 June 2015 for an option of three launches for OneWeb satellite constellation.[26]

References[edit]

  1. ^ a b c Peter B. De Selding (2 December 2014). "ESA Members Agree To Build Ariane 6, Fund Station Through 2017". SpaceNews. Retrieved 3 December 2014. 
  2. ^ Dominique Gallois (1 December 2014). "Ariane 6, un chantier européen pour rester dans la course spatiale En savoir plus sur http://www.lemonde.fr/economie/article/2014/12/01/les-europeens-s-appretent-a-mettre-ariane-6-en-chantier_4532259_3234.html#yXflssd7gdjQhx72.99". lemonde.fr. Retrieved 18 February 2015. 
  3. ^ "Ariane 6". ESA. 15 June 2015. Retrieved 20 July 2015. 
  4. ^ a b Michel Cabirol (7 July 2014). "Faut-il donner toutes les clés d'Ariane 6 a Airbus et Safran?" (in French). La Tribune. Retrieved 5 August 2014. 
  5. ^ a b "Europe to press ahead with Ariane 6 rocket". BBC News. Retrieved 2015-06-25. 
  6. ^ a b c "Ariane 6". cnes.fr. Archived from the original on 9 December 2014. Retrieved March 2015. 
  7. ^ "Ariane 6". esa.int. Archived from the original on 7 January 2015. Retrieved March 2015. 
  8. ^ Stephen Clark (21 November 2012). "European ministers decide to stick with Ariane 5, for now". Spaceflight Now. Retrieved 22 November 2012. 
  9. ^ Feldman, Mia (11 Jul 2013). "European Space Agency Reveals New Rocket Design". Retrieved March 2015. 
  10. ^ "Europe okays design for next-generation rocket". PhysOrg. 9 July 2013. Retrieved 9 July 2013. 
  11. ^ de Selding, Peter B. (24 May 2013). "With Ariane 6 Launch Site Selected, CNES Aims To Freeze Design of the New Rocket in July". Space News. Retrieved 25 May 2013. Ariane 6 would fly in 2020 assuming a development go-ahead in 2014. CNES's Ariane 6 team is operating under the “triple-seven” mantra, meaning seven years' development, 7 metric tons of satellite payload to geostationary transfer orbit and 70 million euros in launch costs. CNES estimates that Ariane 6 would cost 4 billion euros to develop, including ESA's customary program management fees and a 20 percent margin that ESA embeds in most of its programs. 
  12. ^ Peter B. De Selding (18 March 2014). "Questions Swirl around Future of Europe's Ariane Launcher Program". SpaceNews. Retrieved 23 March 2014. 
  13. ^ a b c Svitak, Amy (10 March 2014). "SpaceX Says Falcon 9 To Compete For EELV This Year". Aviation Week. Retrieved 11 March 2014. As SpaceX and other launch contenders enter the sector—including new rockets in India, China and Russia—Europe is also investing in a midlife upgrade of the Ariane 5, the Ariane 5 ME, which aims to boost performance 20% with no corresponding increase in cost. At the same time, Europe is considering funding a smaller, less capable but more affordable successor to the heavy-lift launcher, the Ariane 6, which would send up to 6,500 kg (14,330 lb.) to GTO for around $95 million per launch. 
  14. ^ de Selding, Peter (20 June 2014). "Airbus and Safran Propose New Ariane 6 Design, Reorganization of Europe's Rocket Industry". Space News. Retrieved 6 June 2015. European space-hardware builders Airbus and Safran have proposed that the French and European space agencies scrap much of their previous 18 months' work on a next-generation Ariane 6 rocket in favor of a design that includes much more liquid propulsion. 
  15. ^ Amos, Jonathan (5 July 2014). "Ariane 6: Customers call the shots". BBC. Retrieved 6 June 2015. 
  16. ^ "Safran-Airbus Group launcher activities agreement". Safran Group. 16 June 2014. Retrieved 6 June 2015. 
  17. ^ Michel Cabirol (7 July 2014). "Privatisation d'Ariane 6 : comment Airbus et Safran négocient le "casse du siecle"" (in French). La Tribune. Retrieved 5 August 2014. 
  18. ^ Cyrille Vanlerberghe (8 July 2014). "Le choix d'Ariane 6 divise industriels et agences spatiales" (in French). Le Figaro. Retrieved 5 August 2014. 
  19. ^ a b "France raises heat on decision for next Ariane rocket". EXPATICA. 18 September 2014. Retrieved 18 September 2014. 
  20. ^ a b Cyrille Vanlerberghe (5 September 2014). "Ariane 6 : la version de la derniere chance" (in French). Le Figaro. Retrieved 18 September 2014. 
  21. ^ "ESA's Ariane 6 Cost Estimate Rises with Addition of New Launch Pad". Space News. 24 September 2014. Retrieved 26 September 2014. 
  22. ^ "ISS Expected To Take Back Seat to Next-gen Ariane as Space Ministers Meet in Zurich". Space News. 22 September 2014. Retrieved 6 June 2015. The space ministers of France, Germany and Italy are scheduled to meet Sept. 23 in Zurich to assess how far they are from agreement on strategy and funding for Europe's next-generation Ariane rocket, upgrades to the light-lift Vega vehicle and — as a lower priority — their continued participation in the international space station. The meeting should give these governments a better sense of whether a formal conference of European Space Agency ministers scheduled for Dec. 2 in Luxembourg will be able to make firm decisions, or will be limited to expressions of goodwill. 
  23. ^ a b Amos, Jonathan (5 June 2015). "Airbus unveils 'Adeline' re-usable rocket concept". BBC News. Retrieved 25 June 2015. 
  24. ^ "Une version réutilisable d'Ariane 6 est à l’étude" [A reusable version of Ariane 6 is under study] (in French). Futura-Sciences. 9 January 2015. Retrieved 7 June 2015. 
  25. ^ de Selding, Peter B. (3 April 2015). "Desire for Competitive Ariane 6 Nudges ESA Toward Compromise in Funding Dispute with Contractor". Space News. Retrieved 8 April 2015. 
  26. ^ "OneWeb takes pole-position in global satellite Internet race". Space Digest. 25 June 2015. Retrieved 25 June 2015. In a press-release, Arianespace detailed that the contract foresees 21 Soyuz launches, plus an option for 5 additional Soyuz and three Ariane 6 missions. (...) Stéphane Israël, Chairman and CEO of Arianespace, noted that this was the first order for new European Ariane 6 launcher. 

External links[edit]