Career
He is remembered for his contributions to sailplane development in the early twentieth century and for building the world"s first purpose-built rocket plane, the Opel RAK.1. Hatry was born in Mannheim and developed an early interest in aviation, joining the Mannheim flying club in 1922. With the club, he became a frequent visitor to the annual gliding competitions held at the Wasserkuppe during the 1920s.
Between 1927 and 1928 he assisted in the construction of the Kakadu (then the largest sailplane ever built) with the Munich Akaflieg (student flying) group.