The Ju 87 Stuka dive bomber was one of the most famous bombers during WWII. It was part of the main force in the ground support of the German Air Force since the start of the Blitzkrieg. Production of the Ju 87A-1 began in early 1937. These were fitted with the Jumo 210D engine and the HPA III propeller. Later in 1937 a new Stuka with the Jumo 210Da engine was put into service, the Ju 87A-2, which can be distinguished by the cut rudder.