Right after WWII a senior engineer at Consolidated Vultee (later Convair and now Boeing) had my dad build a flying car. It was powered by a '40 Mercury flathead V-8, had tricycle gear with the front wheel from a motor cycle and just reverse and a single gear forward. It was extremely light and could burn rubber for about one hundred yards. The wings were detachable and bolted to the body of the car. It did fly but was not practical. The prop for the engine was carved backwards because the Mercury V8 did not rotate in the same direction as most aircraft engines. My dad used the engine from his '40 Merc and replaced it with a Franklin V12 aircraft engine if I recall correctly. The prop was hung in our living room most of my life.