Near the beginning of the Twentieth Century, Nikola Tesla invented an amazingly simple vane less turbine engine which developed ten horsepower per pound of engine weight. By way of comparison, a modern factory high performance, piston engine makes less than one horsepower per pound of engine weight. Tesla achieved this remarkable power to weight ratio with cast iron. Using aluminum for much of the same device would jump the power to weight ratio to at least twenty horsepower per pound, which was Tesla