Designed for young builders, this kit brings the thrill of stunt planes to life with a spinning propeller ... as you rebuild the plane into a jet airplane for even more excitement.

This article was originally published with the title “ The Airplane Propeller, The Latest North Sea Mine Field ” in Scientific American Magazine Vol. 118 No. 23 (June 1918), p. 523 doi:10.1038 ...

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 ...