Flettner Fl 184 – a night reconnaissance and anti-submarine autogyro Flettner Fl 185 – an experimental helicopter Flettner Fl 265 – an experimental helicopter, the world's earliest known airworthy synchropter Flettner Fl 282 "Kolibri" (Hummingbird) – a reconnaissance "synchropter" helicopter Focke-Achgelis Fa 223 "Drache" (Dragon) – an anti-submarine, search and rescue, reconnaissance, and freight helicopter, based on the prewar Fw 61