描述Opel RAK liquid-fuel rocket plane Friedrich Sander.jpg
English: Opel RAK planned a rocket-powered flight across the English Channel using liquid-fuel rockets. Friedrich Sander was the head if rocket technology within Opel RAK, the world's first rocket program. The photo was taken at "Opel Rennbahn" in Rüsselsheim. From the right to the left: Friedrich Sander, Opel technician August Becker, unknown Opel employee.