Later, Wirkkala developed and patented a marine propeller.

From about 1836, marine propellers, invented by Josef Ressel are used.

After the middle 19th century paddle steamers became rare, as the marine propeller gave more speed and burned less fuel.

Common applications include machine tools, automotive applications, snowblowers and marine propellers.

A marine propeller displaces water to push a ship along.

His efficient design drew praise in American scientific circles but by this time there were multiple competing versions of the marine propeller.

Three, four, or five blades are most common in marine propellers, although designs which are intended to operate at reduced noise will have more blades.

One type of marine propeller is the controllable pitch propeller.

The idea worked, but the propulsion force generated was less than the motor would have generated if it had been connected to a standard marine propeller.