[PDF] The History of the XV-15 Tilt Rotor Research Aircraft: From Concept to Flight
http://history.nasa.gov/monograph17.pdf
The History of the XV-15 Tilt Rotor Research Aircraft: From Concept to Flight
첫 현대적 틸트로터기로 인정받는 XV-15의 개발과정에 대한 NASA 자료입니다.
다운링크 : monograph17.pdf