St Croix Aircraft

St Croix Aircraft, was an American manufacturer of wooden propellers for homebuilt and ultralight aircraft and a supplier of aircraft plans and kits. The company headquarters was located in Corning, Iowa.
The company's propellers were constructed from birch, maple and walnut and available in with two to five blades, in diameters up to for engines up to 
St Croix is probably best known for its Excelsior ultralight aircraft design.