APC Electric Speed 400 Series props offer high efficiency and great value for your electric powered models. These props are designed for high speed operation on Pylon Racers, Hot-liners, Flying wings and other similar applications. The center hole of the prop is designed to accept a reducing bushing to fit your propeller shaft. Included with the prop are 2 bushings to fit 5mm and 3/16 inch prop shafts.
The APC Speed 400 Series Pusher props are designed to turn in the opposite direction as compared to the standard props. In most cases, you can simply run the motor backwards in a pusher application, but there are some cases, such as in twin engine planes, Multi-Rotor craft or special co-axial power systems, where you need a matched pair of props with one normal rotation and one reverse rotation propeller. For these types of applications, the pusher props are perfect!
According to the widely accepted Maximum RPM formula of 190,000/D for APC Speed 400 Series props, the 4.75x4.75 prop should not be used over 40,000 RPM.