After 30 minutes filming in dusk today to capture some thunderstorms, did a lot of bug smashing. Cleaning the props I noticed some interesting design features. On the standard props, just inboard from the point of maximum chord, and also maximum camber on the leading edge are four small vortex generators. Almost invisible, and very easy to "sand off" for those that insist on perfectly balanced props I wonder just how much these almost invisible design features affect flying qualities. As a former airline pilot I am very conscious of just how much these small things can affect efficiency and flying qualities of an aircraft. next time you go flying in a jet look out the window and you will see them. Do these exist on every DJI prop?