for Use in Helicopters and Like Aircraft", filed 13 July 1960, granted 22 October 1953 (based on German patent granted 9 July 1955) Patent by Hans Derschmidt (primary) John Taylor, "VTOL Aircraft", Flight International, 25 July 1963, pg. 130-131 (Report 1963), "Paris Report", Flight International, 13 June 1963, pg. 901-912 "Bölkow BO 46 V1" (in German) External links Airbus page Bavarian history of aviation Air traffic museum Derschmidt - Lagging Blade Rotor Discussion 3MB Discussion 2, AD0864924 Further links 1960s German experimental aircraft 1960s German helicopters Bo 046 Single-turbine helicopters Aircraft first flown in 1964