last update December 07, 2010

Natural Composite Blades

Our natural composite blades are made out of high compressed thin layered laminated beech wood, which has a similar tensile strength as steel, in the root section and selected lightweight laminated spruce wood in the remaining part of the blade.
Natural Composit Blade drawing
The wooden core is reinforced by layers of epoxy fiberglass, Kevlar® or carbon fiber and sealed by several coatings of acrylic-polyurethane paint.
An aluminum blade ferrule is attached to the blade root by using special design patented lag screws.

The critical section of the blade's leading edge is protected by a bonded on stainless steel erosion sheath. The inboard section of the leading edge is protected by a self-adhesive PU-strip.
All of the above makes the blade all weather operable.

A special advantage of natural composite blades is the low weight and low inertia, which significantly reduces vibration and provides a quick throttle feedback.

Composite material allows blades to be built with a special cross-section dimension, which increases take off and climb performance.

The capability of designing multi-blade propellers with a smaller diameter eliminates high-speed drag and increases cruise speed. Metal propeller blades built to these dimensions would be too heavy.
The reduction in diameter also reduces noise and stress on the engine and crankshaft while increasing ground clearance.

Natural composite propeller blades will not fatigue over time whereas metal propeller blades are life-limited by fatigue and dimension.
Natural composite props are unique in that each overhaul returns the blades to their original dimension by adding or replacing composite material to the damaged section of the blade. In the event of a ground strike, the blades are often reparable, the hub is re-usable and the risk of an internal damage to the engine is significantly reduced.