Finally for quietness in a boat use CENTA highly flexible couplings with damping, which as a first step allow the use of flexible mountings for the engine. However this is normally not sufficient as a large part of the noise and vibration is passed into the body of the boat through the gear and the rigid coupling between the gear and the propeller shaft. Placing a CENTA highly flexible coupling between the gear and propeller shaft will complete the reduction of noise and vibration. The noise reduction achieved will be up to 5 dBA, that means a reduction of up to a third.
Torsionally elastic, backlash free, potentially damaging torsional vibration produced by the engine is dampened, especially at low speeds
Additionally, noise is dampened by up to 5 dBA, the rubber of the coupling does not lead the noise of the engine to the hull. Reduced vibrations protect all parts of the unit in particular those of electronics
The couplings compensate for all types of misalignments, particularly angular, thus reducing wear on the shaft bearing and gearbox
The propeller thrust or propeller pull (in reverse drive) is transmitted from the propeller shaft to the gearbox, or in the case of type CF-AGM it is transmitted directly onto the hull of the vessel
The coupling is fastened to the plain cylindrical propeller shaft by means of a securely dimensioned clamping hub, thus expensive machining of the shaft is not necessary. Length adaptation is simple, and there is no weakening of the propeller shaft diameter caused by a bore or keyway
Simple assembly, with flange connection and hubs supplied fully machined for immediate installation. They can also be delivered with a suitable adapter flange to mount to any non standard gearbox flange
between engine and gear
gear and propeller shaft
water jet
Z-drives etc
The couplings are electrically insulating and therefore give protection from electrolysis damage.
