Ideal for electric gliders and any other electric model without undercarriage, APC folding propellers are available in a wide range of sizes to suit almost any model. Uniquely, APC folding propellers are sold as pairs of blades, with the required size of propeller hub being bought separately. This has the advantage of allowing the exact diameter of hub to be fitted to suit the spinner/nose of model, so that the propeller blades fold flat along the fuselage.