[매일매일 항공상식] 1947년 Chuck Yeager는 Bell X-1으로 세계 최초 수평비행상태에서 M1.06로 음속돌파비행에 성공하였습니다 Korean 4:1947 Yeager in Bell X-1:1st flight to break Mach1
3:49 PM - 23 Mar 2012
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