Heinkel He51B1

German biplane fighter, created in the early 1930s by the Ernst Heinkel Flugzeugwerke aircraft manufacturing company under the leadership of the Günter brothers. The plane had a sturdy construction and was very elegant externally, and displayed good flight characteristics. At the commencement of military operations during the civil war in Spain in 1936 it was one of the first types to equip the Condor Legion, engaging in air combat with the Republican Air Force. It was generally inferior to its rivals and was soon retired from the front line and transferred to training and other units