ttps://newatlas.com/military/rolls-royce-advanced-jet-engine-power-tempest-fighter/

2020.1
Rolls-Royce developing advanced jet engine to power Tempest fighter

ttps://aviationweek.com/defense/aircraft-propulsion/engine-demonstrator-strengthen-uk-japan-fighter-ties

2022.2
Engine Demonstrator To Strengthen UK-Japan Fighter Ties

The demonstrator will likely feature technologies from Rolls-Royce’s FCAS TI and IHI’s development of the XF9 indigenous fighter engine.

ttps://www.aspistrategist.org.au/gcap-a-big-fighter-designed-for-pacific-and-australian-distances/

2024.8

The wing sweep angle doesn’t seem to be optimised for supersonic cruise—supercruise. A fighter that can supercruise has much greater opportunity to make intercepts, but the feature has costs: it needs either an engine design that isn’t ideal for subsonic speed (one reason for the F-22’s non-stellar range) or one that has the complex and costly feature called ‘variable cycle’ (which has not been mentioned at all in the GCAP context).

可変バイパス比エンジンは無かったことに
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