Its high-pressure core is derived from the CFM56, matched to a new twin fan low-pressure section for a reduced bypass ratio better suited to supersonic flight.

[2] The final engine configuration was a core with billions of operational hours – suggesting the CFM56 – and a new low-pressure section optimized for supersonic speed.

[2] Following the collapse of Aerion on 21 May 2021, GE Aviation discontinued development of the Affinity engine, leaving no supersonic turbojet supplier for the Boom Overture,[6] after Rolls-Royce also announced the end of their involvement in the project.

[3] An engine for supersonic flight needs a lower bypass ratio than modern turbofans, and a higher flow speed for better efficiency.

This is limited by noise regulations at takeoff, and a lower compression core like the CFM56 is better suited to higher temperatures encountered supersonically.

Preceded by fixed inlet guide vanes with movable flaps, the twin blisk fans have wide-chord titanium blades.