Presently most of our blades are built in natural composite design, by using 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.
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.

The spinner dome is a single piece part made from fiber reinforced composite (Kevlar®), which replaces the spinformed aluminum alloy used in the earlier days and is extremely crack resistant as well as very light.
The bulkheads are made from spinformed or die forged aluminum alloy. The front bulkhead is seen as a part of the hub assembly and also used as attachment point for static balancing weights. Filler plates increase the stiffness of the dome around the cutouts for the blades. The dome is attached to the bulkhead with stainless steel spinner screws.

Three different control units are available for these propellers:

P-120-M stands for manual pitch control, only. The pitch of the rotating propeller changes when pressing the center return toggle switch on the front panel of the control unit up or down. Neutral position stops the pitch change and the blade angle remains in the present position. The electric current for the pitch change is transferred from a brush block via slip rings to the DC-motor. When reaching the mechanical stops, a current limiter in the control unit switches the current off. A green indicator light goes on when reaching low pitch stop. There is no light to indicate high pitch stop or feathering position.

The pilot must monitor the RPM when changing power and/or speed and must manually change the pitch to the appropriate settings.

If the control unit is used for a reversible propeller at an airship application, the toggle switch is replaced by a two position switch, which only allows normal forward and reverse position. The end position of the blade pitch for forward thrust is indicated by a green light, the end position for reverse is indicated by a yellow light.

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