SigmaDrive Flexible Propeller Shaft Coupling
SigmaDrive is a flexible propeller shaft coupling that is effective noise and vibration suppression for most vessels up to 1300 hp. SigmaDrives is unique as it is able to absorb thrust when installed as a standalone propeller coupling directly from the shaft to the output flange on the transmission. SigmaDrive solves issues due to imperfect engine alignment between the propeller shaft and the engine, compensating for up to 3 degrees in all directions.
Manufactured from a special bronze alloy, SigmaDrives require virtually no maintenance and containing no bearings or rubber in their construction. The knock on effect of using a SigmaDrive shaft coupling is that the forces typically generated from misalignment will not be transferred to the engine or transmission extending their life significantly.
Unlike existing shaft couplings SigmaDrive does not use rubber to dampen the vibrations or take out misalignment. SigmaDrive shaft couplings are special constant velocity joints that are able to resist the propeller thrust without the need for thrust bearings in most applications. They are extremely compact and able to transmit higher torque than other propeller shaft couplings with similar dimensions. In addition, as they do not use rubber as a vibration suppression device, they are an exceptionally long wearing marine coupling, with minimal maintenance needed.