However, none of those designs made it to production aircraft, mostly due to decreasing oil prices and concerns over the high noise footprint of those engines.

[4][5][6] Both Safran and GE Aviation had experimented with open rotor based engine designs in the years before the RISE project was announced.

[1] The single-rotating design had previously been validated by the IRON project as part of the Clean Sky 2 program,[7] and GE had dubbed the concept as the Unducted Single Fan (USF) engine.

[11] The fixed stator vanes vary their pitch to collimate, or de-swirl, the flow, and they close almost completely together to act as an air brake, avoiding the need for a thrust reverser.

[12] The RISE will also use a recuperator, which captures waste heat from the exhaust gas to pre-heat the air that exits the compressor before it enters the combustor.