In a bubble test, air is blown in front of the spinning propeller to visualize the flow of the water. This revealed some stalling on the bi-blade and the toroidal design too, which would explain ...

The photograph shows a windmill of the type that opened up the western plains of the United States by providing a reliable source of well water for cattle farming. By providing power to a propeller it ...

The S.S. Badger passenger ferry will be dry docked in Sturgeon Bay for propeller shaft bearing repairs. The ferry will make the 12-hour trip from Ludington to Sturgeon Bay under its own power ...