Marcel Leyat was a French maker of bizarre propeller-driven cars, with a factory on the Quai de Grenelle in Paris.
The first model, the Hélica, had a Scorpion engine of 8 bhp (6.0 kW), far more than adequate for a vehicle with a body weighing just 250 kg (550 lb). Nearby pedestrians possibly regarded it with even more trepidation than passengers. Parking would have been an interesting undertaking.
In 1927, A Hélica reached the speed of 106 mph (171 km/h) at the Montlhéry circuit.
See Wikipedia entry.