The engineers became pretty inventive, even finding ways to fire bullets through the path of the wooden propeller blades while somehow not tearing them to splinters. At the start of the war ...

Once dry, the propeller contours are penciled on from ... and then the excess wood is removed with pneumatic planes designed and developed by [NACA] to constantly blow shavings all over the ...

Although looking at the images might suggest a Japanese bullet train, this was actually an experimental German railcar named ...

The engine then over sped leading the pilot to make the decision to return to the airport, not knowing that he had lost the wooden propeller. Despite managing to line up a return to the field ...