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IHIの幹部がGCAP搭載用エンジンのプロトタイプを20年代後半までに共同開発すると言っている通り
まだプロトタイプは存在しない

He said the two companies aim to develop an engine prototype by the late 2020s to enable integration into the initial batches of
GCAP fighters to be produced from the mid-2030s. Initial tests of the engine will take place in the UK, he said.