Why is the world returning to propellers?

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解析科普全球最新軍武科技，本頻道是火力就是正義（百科頻道）唯一官方頻道！ —火力君將為各位帶來全球最新裝備，各類武器研發計畫，以及各國未來裝備推測分析等內容若本頻道有影片版權問題。 —若有影片版權問題，請通過郵箱聯繫，火力君將積極配合！ Analyzing the latest military science and technology in the world, this channel is the only official channel of Firepower is Justice (Encyclopedia Channel)! - Mr. Huoli will bring you the world's latest equipment, various weapons research and development plans, as well as speculation and analysis of future equipment in various countries. If there are any video copyright issues on this channel. —If you have any questions about the copyright of the video, please contact us via email and Huolijun will actively cooperate!