SunPlower Propeller is the world’s first (PCT patent filed) to make this in a compact and scalable hub (impossible for 100 years). KBP is more efficient than screw propellers and far more efficient and older than Voith Schneider Propeller (VSP). Its runs at a much lower RPM (lower noise) than any other propeller.

ICE engines are optimal for a small range of RPM, and cannot start under load - clutches and gearboxes (eliminated in EVs) are used for decoupling starting load and also for variable RPM/torque in automobiles. In aviation, shipping & marine industries, the variable pitch propellers were used to run at ICE's optimal RPM without clutches and gearboxes (VSP was developed for ICE engines - in spite of its low efficiency and high complexity). 

The father of helicopter technology is VSP, many experts are not aware that KBP is the grandfather of helicopter technology/Thrust Vectoring technology from the 1920s.

Now with electric motors (wide RPM range), we can not only eliminate the need for variable pitch propellers but also eliminate the need for complex swashplates (stress plates) in Helicopters (blades in the circular path) and also in VSP (blades in the cylinder path) for "Thrust Vectoring".

SunPlower Propeller Technology is the world's first compact scalable 2-D directional thrust propeller.

SunPlower Propeller blades push the fluid (air/water) similar to birds and fishes (no fluid screwing like screw propellers). This creates less turbulence, which makes this low noise technology optimal for UAM and also optimal for stealth mode military planes and submarines.