Carbon-fiber propeller blades for multirotor UAS, supplied as dynamically balanced CW and CCW matched pairs for the KDE-DPAHL-ML dual-propeller blade adapter. The propeller spans 698.5 mm at 8.9 in pitch, and each blade weighs 43.2 g.
The KDE-CF275-DP is a carbon fiber propeller blade from KDE Direct with a mass of 43.2 g and a diameter of 698.5 mm. The KDE-CF275-DP Propeller Blades, Dual-Edition Series (CW/CCW Pair) are carbon fiber propeller blades for multirotor UAS, made by KDE Direct. Each blade is built from a 3K carbon-fiber matrix, the same true carbon-fiber 3K material KDE Direct supplies to its military customers, and it is offered for commercial and industrial applications as well.
Each set contains two CW and two CCW blades, supplied as dynamically balanced, matched pairs for a dual-propeller layout. A CW (L) edition and a CCW (R) edition cover the two rotation directions. Because the pairs are balanced and matched, the blades are intended to be installed without secondary balancing, which supports smooth, vibration-free operation. Blades cannot be intermixed between pairs, so they should be kept organized as matched blades. If a single blade is damaged during operation, the whole CW or CCW pair must be replaced.
The propeller diameter is 698.5 mm with the blades installed on the adapter, and the pitch is 8.9 in. Each blade weighs 43.2 g. The design is optimized by finite element analysis for maximum strength and minimum weight, which keeps the rotating mass on each motor low. For an integrator, the diameter and pitch define the size and loading of the rotor, and the matched-pair balance reduces the vibration passed into the airframe. The material is carbon fiber with a 3K matrix, and the pitch is fixed.
Each blade mounts through a hole at its root, fitted with a shim, and attaches to the adapter hardware. The blades are designed for the KDE-DPAHL-ML H-L dual-propeller blade adapter, and two adapters are required for each set, one for the CW pair and one for the CCW pair. Compatible KDE Direct brushless motors are the KDE7208XF-110, KDE7208XF-135, KDE7215XF-135, KDE8218XF-120 and KDE10218XF-105. For tightening the hardware, KDE Direct lists the KDE-TWWI-HL and KDE-TW5530 torque wrenches as compatible. KDE Direct does not release CAD models of its propellers because of the proprietary airfoil design, but a design geometry dimensions specification sheet and an installation diagram for the adapter are available.
The sources list no certifications or standards for this product, so qualification requirements should be confirmed with the maker. The blades suit multirotor UAS in commercial, industrial and military use that are built around the KDE Direct motor and adapter series listed above.
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