Hi Peter
It is a standard Flexible coupling that will shear before the gearbox if
you get a chain etc round the prop! The drive parts are made from a hard
plastic and is designed to shear in the event of a major problem. In teh
UK made by R&D and costs about £35. Cant be used with a Combi gearbox
only when using a standard type gearbox.
Cheers
Steve Birch (Technical)
