"From 1931 Ferdinand Porsche and Zündapp developed the prototype Auto für Jedermann, which was the first time the name "Volkswagen" was used. Porsche preferred the 4-cylinder flat engine, but Zündapp used a water-cooled 5 cylinder radial engine. In 1932 three prototypes were running. All three cars were lost during the war, the last in 1945 in Stuttgart during a bombing raid." (Wikipedia)