9x4.5 Multi Rotor Propeller Set (4) (APC09045MRB4)

APC is proud to provide a line of propellers specifically designed for Multi-Rotor applications (Quad-Copters). These propellers bridge the gap between our Thin Electric propellers and Slow Flyer propellers. The "˜MR' propellers are lighter than the Thin Electrics and have a higher RPM capability than the Slow Flyers. APC suggests a maximum RPM of 105,000 per prop diameter in inches for Multi-Rotor props.