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GCAPには三つの実証プロジェクトがあってそれぞれ飛行技術、電子システムとパワー(推進と電力)関係の技術を実証する
飛行技術は実証機、電子システムはエクスカリバーFTB、パワーは共同実証エンジン

オッペケが足りない脳みそで必死に曲解しようとしてもすでにGCAPのプロジェクトとして進行してる

https://aviationweek.com/defense-space/aircraft-propulsion/uk-advances-tempest-demonstrator-toward-2027-first-flight

The flying demonstrator is one of three demo programs being developed as part of work on the Tempest combat aircraft and the wider Global Combat Air Program (GCAP) with Italy and Japan. Other major demonstrator programs within the GCAP include the Excalibur Boeing 757 Flight Test Aircraft and the Rolls and IHI Corp. development of a power system—including the combined engine and electrical generation system—that Italy’s Avio Aero recently joined.