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 skydiver has been killed after walking into a spinning plane propeller in a "tragic" airfield accident. Amanda Gallagher, ...

The two propellers spin in opposite directions, and power is transferred from the engine through a planetary gear or spur ...

It turns out that not even BMW's spokespeople know that its Roundel emblem wasn't inspired by a spinning propeller. It's a common misconception, one that's finally been cleared up by BMW spokesman ...

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 ...