The HM7 is ArianeGroup’s other engine, giving Europe access to space

The latest HM7 engine has been produced and has just passed its acceptance test on Vernon’s ArianeGroup site. This cryogenic engine may not mean anything to you, but for more than 43 years, it has guaranteed autonomous access to space for satellites in Europe. It equips all Aryans from Aryan 1 to Aryan 5 With the Aryan 6, it will give way to the reconstructible Vinci engine Olivia Condaminate, the liquid propulsion manager of the Aryan Upper Stage at the Aryan Group, reminds us of its specialty.

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HM7. This is the name of a cryogenic engine that probably means nothing to you. Although less known than that Viking Of Arian 4 and of the Vulcans5 in Ariadne And the Ariane 6, HM7 nevertheless remains a historic and essential driver of European space missions. For more than 40 years, it has enabled Europe to have independent access to space for its satellites.

This is the propulsion engine Hydrogen And Oxygen Liquid, whose technologies were used in the 1960s, has decorated all the upper floors Pitcher Of the Ariadne family. He flew the first Aryan 1 on December 24, 1979, and will fly the last Aryan 5, with a launch scheduled for 2023. He will then contribute 260 times to propel Aryan with his hundreds of passengers Orbit Around the world … and sometimes far away. At Lagrange Point 2 (Herschel, PlanckJ.ames-webb) And more with missions Giotto And Rosetta For example.

Of a Mass Of 165 KilogramsThe HM7 provides some 7-ton vacuum as well as a thrust Specific emotions Of the 446s.

Tomorrow, it will be replaced by a re-burning Vinci engine Ariadne 6 Thus providing customers with a greater versatility of missions needed for new needsAryanspace. A few days ago, the latest Ariane 5 HM7 engine passed its acceptance test on Vernon’s ArianeGroup site. The PF41 test bench, on which it has been tested for more than 40 years, will now contribute to writing a new page in the space adventure: the green hydrogen revolution.

This is an opportunity for us to introduce you to this little known engine. Words Olivier Condaminate, Propulsion Manager Liquid Aryan Upstairs, in the Aryan Group.

Futura: What were the significant innovations or technological advances in this engine when it entered service in 1979?

Olivia Condaminate: When the HM7 engine entered service, it was the first cryogenic engine used in Europe. It represents real technological progress in terms of extreme temperature control, very cold as well as very hot for the components.

HM7 inherited from which engine?

Olivia Condaminate: The HM7 is based on the experience gained during the development of the HM4 engine, a prototype engine with a 4 ton thrust equipped with a turbo pump feeding 4. Combustion chamber In liquid hydrogen and oxygen, and which never flew.

If so, will the HM7 engine leave a legacy?

Olivia Condaminate: All cryogenic engines developed in Vernon are part of the HM7 tradition Matter Design, development and implementation. So we include a series of Vulcan engines (Volkain, Volkain 2 and Volkain 2.1), the Vinci that will equip the upper level of the Arian 6 and PrometheusWhich will work with an oxygen-methane mixture, a Protesters A very low cost reusable engine, which is intended to be ten times less expensive than Ariane 5’s current Vulcain 2 engine.

Does the HM7 have a special feature that makes it unique, for example, perfectly compatible with the Ariane 5?

Olivia Condaminate: From the H8 stage of the Ariane 1 to the Esca stage of the Ariane 5, the HM7 engine has operated the upper stages of the Ariane for over 40 years. It is suitable for all missions targeting high level engine equal superiority, especially geostationary orbit.

Year after year, Ariane 5’s performance never stopped improving. From about 6 tons for the first Ariane 5 (Ar 5G), the performance for the Ariane 5 ECA has been more than 10 tons, including a record flight with more than 11 tons payload (VA 255, 11,210 kg). How much has HM7 contributed to this continuous improvement in the performance of Aryan 5?

Olivia Condaminate: These are basically Booster And the Vulcain engine which provides the main thrust and contributes to the performance in terms of payload mass. Evolution of these engines has contributed to the increase in Arian power, especially the transition from the Vulcan version to the Vulcan 2.

For the upper stage of the Aryan 6, the HM7 will be replaced by a restartable Vinci engine. Has it been replaced “only” because the Vinci flight could be reintroduced several times or its technology, which dates back to the 1960s?

Olivia Condaminate: Outside of realting, which is the main argument, we can mention the increase in thrust (7 tons to 18 tons) and the industrial optimization of its production.

If HM7 and Vinci were and would be the guarantors of European autonomy in access to space, Vinci must do so at a reasonable price, which was not a priority in the early 80’s to achieve this autonomy. Is the production and use of HM7 also a factor pushing its withdrawal?

Olivia Condaminate: Vinci has actually been optimized in this sense.

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