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その新技術の検証も共同実証でやってる

“We are now sending IHI engineers to Rolls-Royce and they are sending engineers to us in Japan,” said Sato. “There are a lot of new technologies that need to be validated. Another priority is the design of the engine to ensure it can be integrated into the new fighter aircraft.”

後半の説明を見ると機体の大きさはほぼ決まっててエンジンの設計を機体のスペースに合わせる必要がある