Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,101 pages of information and 233,633 images on early companies, their products and the people who designed and built them.
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.