New book Politics, economy and society Latest information on helicopters What helicopter can transform itself into an airplane in the air? Why doesn't it fall off quickly when the engine stops? Science I Shinsho 117
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Japanese title: 新書 機械工学 ヘリコプターの最新知識 空中で飛行機に変身できるヘリコプターとは? エンジンが止まってもすぐに落ちない理由は? サイエンス・アイ新書 117