After the armistice was signed, the Allies prohibited German military
to produce aircraft engines. Therefore BMW turned to boat and truck
engines and farming equipment. Meanwhile, in secret, Popp continued
to work with his engineering director Friz on aircraft engines.
A successor for the Type IIIa engine is born. It is named naturally Type IV. With this engine, Franz Zeno Diemer
sets an altitude record of 9,760 metres (32,013 ft).
Type IIIa
Type IVa
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