Propellers supplied on the SAMBA XXL and the LAMBADA are manufactured by Woodcomp s.r.o in the Czech Republic. Woodcomp produces 2000 wood and wood composite propellers annually in 150 different versions from fixed pitch to electrically, to in-flight ajustable and constant speed options.
The VARIA propeller is an in-flight, mechanically adjustable aircraft propeller having a mass of only 4.5 kg. The pitch adjustment system is mechanical and operates through the hollow shaft of the reducer gearbox. It has the option of feathering as implemented on the LAMBADA.
The Duralumin hub of this in-flight adjustable propeller is designed to achieve the highest possible safety levels, and complies with all the latest regulations concerning fail safe operation and control of blade angle setting. Blade angle setting is achieved by a slotted guide device in the hub, which ensures smooth, simultaneous adjustrment of the all the propeller blades, allowing smooth and precise adjustment of the angles of incidence.
The mechanism is equipped with stops for precise setting of the basic angle of incidence for take off, optimum climb and landing performance. It also has a stop for the maximum angle used for high speed flight. This mechanism eliminates possible pilot errors made during hurried or imprecise setting of the blade angle.
In case of failure (cable break), the propeller automatically resets to its basic position - fine pitch - for take off, therefore climbing and landing performance is guaranteed.
Blades are securely clamped into the duralumin hub which does not allow them to turn or vibrate.
The propeller blades are manufactured with a composite shell, made of special, new generation fabrics. This design creates an excellent sandwich construction. The rotational and centrifugal forces are transferred to the propeller hub by means a composite shaped tube. This is a significant structural element. It is inserted into the shank, the blade root and into the blade body itself.
WOODCOMP SR 3000
The SR 3000 is an electrical, in-flight adjustable propeller of mixed construction. It is intended for the Rotax 912 UL / S engines, and is available in either a 2 or 3 blade configuration.
The pitch angle of the blades is adjusted by means of an electrical servo, controlled from the cockpit. Pitch can be smoothly changed in a range from fine pitch, suitable for take-off, to coarse pitch, allowing efficient cruise. The system allows a range of pitch adjustment through at least 20 degrees from the minimum angle to the maximum angle. (for example 10° to 30°, or 14° to 34° ).
The end positions of blade pitch adjustment are locked by two systems. The primary system is electrical and operates when the end stop on the blade comes into contact with the end switch and closes it, which terminates the motion of blade at this angle. In the event of primary system failure, the electric servo is provided with a duplicate end switch, for both fine and coarse position.
Control of the pitch angle is achieved by electronic propeller control on the instrument panel, or by mechanical control in the event of an electrical failure.
The propeller can be equipped with a feathering feature, enabling complete feathering of the propeller in flight.
The cockpit propeller control system can be supplemented with an electronic governor MCS 3000. This enables the pilot to select the desired propeller RPM for climb and cruise phases of flight. The regulator will then automatically adjust propeller pitch to maintain a selected RPM. In this case the propeller behaves as a constant-speed propeller.
A switch is installed on the instrument panel to allow selection of manual or automatic / constant-speed control of the propeller.