The new scheme is put forward to design magnetic pulley with large torsional moment by means of planar contact between end-cover and added flange fixed axially by stud bolt.

To spherical hinge connection at one end, damper of flange connections at one end and the other end supported by flange connections are made into spherical hinge connections.

At least one second nozzle tube is fluidly connected to the fuel source and spaced radially outward from the first nozzle tube with a proximal end fixed to the flange.