In the French hypersonic propulsion programs there is an interesting one that this society is developing in the test facilities they have in Bourges-Subdray.

-They are engines of the scramjet-type for missiles or aircraft with speeds of Mach 6.

“Scram-jet at Bourges”

The combustion chamber is rectangular with three rows of injectors, the last one with hydrogen.

From Appendix 11: In 2003 it merged with Royal Ordnance Rocket Motors to form Roxel, an Anglo-French group.