KDE-CF305-DP carbon fiber propeller blades, 30.5 x 9.7 in, dual edition (CW/CCW)

The KDE-CF305-DP is a carbon fiber propeller blade set from KDE Direct, a dual-edition propeller for heavy-lift multirotor UAS. It is supplied as a matched CW pair and a matched CCW pair, two blades each, so one set serves two counter-rotating rotor positions. The blades are made of 3K carbon-fiber matrix, the same type of material KDE Direct supplies to military customers, and are also offered for commercial and industrial applications.

The key figures define how the blade fits a rotor design. The installed propeller diameter is 774.70 mm, which sets the rotor disc size, and the pitch is 9.7 in. Each blade weighs 52.9 g, and KDE Direct states that the design is FEA optimized for maximum strength and minimum weight, which keeps the rotating mass low. A design geometry dimensions specification sheet gives the full blade drawing, including blade length, root width and the mounting hole pattern.

The blades install on the KDE-DPAHL-ML H-L dual-propeller blade adapter (ML series). Two adapters are required for each set, one for the CW pair and one for the CCW pair. KDE Direct lists these brushless motors as compatible: KDE7208XF-110, KDE7208XF-135, KDE7215XF-135, KDE8218XF-120 and KDE10218XF-105. For tightening, the compatible torque wrenches are the KDE-TWWI-HL and the KDE-TW6030. KDE Direct does not release CAD models of its propellers because of the proprietary airfoil design, so integrators work from the geometry specification sheet and the installation diagram for the adapter series.

Every blade is dynamically balanced and delivered in a matched pair, so no secondary balancing is needed before installation. Blades cannot be intermixed between pairs. If a single blade is damaged, the whole CW or CCW pair has to be replaced to keep the balance and smooth, vibration-free operation.

The sources list no certifications or standards for this propeller set. Integrators who need qualification data should request it from KDE Direct.

Typical use is as the propeller of a heavy-lift multirotor UAS built on KDE Direct brushless motors and propeller blade adapters, in commercial and industrial platforms as well as military customers' systems. The matched, pre-balanced pairs suit integrators who want to install the blades without additional balancing work.