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 ...

A 37-year-old Kansas woman was killed after she backed into a plane's spinning propeller while trying to take photos, officials said. Amanda Gallagher, a photographer, was on the plane to snap ...

the open-source Propeller Platform Modules and the Spin programming language that’s used to control things. All of the basics and a growing selection of more advanced topics are covered in ...