APC Folding Props are great for applications that require short bursts of power, with extended periods of gliding in between, such as Electric Sailplanes, Motor Gliders and LMR (Limited Motor Run) type models. When the motor is turned off, the airflow folds the prop blades up against the aircraft fuselage
reducing the prop drag for more efficient gliding flight.
According to APC's published Maximum RPM formula of 145,000 ÷ D for APC Folding props, the 7x4 prop should not be used over 20,714 RPM.
Please note, this package only include a pair of blades, as shown in the photo. To complete the prop, you will need to purchase the APC-FH45mm-6 folding prop hub kit