In post war Germany, General Aviation flight was not permitted until 1956. At the time of this rejuvenation, the Porsche 678 aircraft engine was being developed. This was based on the 4 cylinder Porsche 356 car engine. This air cooled engine was modified for the aviation environment.
At this time Alfons Pützer was also developing the Elster A airframe, powered by the 52HP 678/3 Porsche engine. This was followed by the Elster B version powered by the 75 HP Porsche 678/4 engine and the Rolls Royce Continental C-12F and C-14F engines.