Armidale Class Patrol Boat: Torsionmeter Removal and Reinstallation Procedure

Abstract : As part of its research program DSTO has fitted torsionmeter systems to two Armidale Class Patrol Boats, HMAS Maryborough and HMAS Glenelg. These systems consist of shaft mounted torsionmeters, an engine room mounted controller and a bridge mounted remote display. The torsionmeters are located on the bobbins which are the couplings between the propulsion system gear boxes and propellor shafts. The torsionmeters measure the torque and speed of rotation of the bobbin and consist of a rotating component (rotor) and a hull mounted surrounding component (stator). During major service of the propulsion system it becomes necessary to remove the bobbin hence the stator component of the torsionmeter must be first removed and the rotor component suitably protected. This technical note describes the process of removing the stator, protecting the rotor and reinstalling the stator.