ðə tˈɜːbəsˌeɪl ɔːɹ fɹˈɛntʃ ɪz ɐ mɚɹˈiːn pɹəpˈʌlʃən sˈɪstəm jˈuːzɪŋ ɐ sˈeɪllˈaɪk vˈɜːɾɪkəl sˈɜːfɪs ænd ɐ pˈaʊɚd bˈaʊndɚɹi lˈeɪɚ kəntɹˈoʊl sˈɪstəm tʊ ɪmpɹˈuːv lˈɪft əkɹˌɑːs ɐ wˈaɪd ˈæŋɡəl ʌv ɐtˈæk.
The turbosail or French  is a marine propulsion system using a sail-like vertical surface and a powered boundary layer control system to improve lift across a wide angle of attack.