Roll damping rig
A special rig has been developed to measure roll damping on such models and an isometric sketch of the rig is shown in Fig. 2 . The control system enables the model to be driven automatically at a series of preset steady RPMs for pre-determined durations. An 8-way slip ring installed over the drive shaft transfers the balance signals to the stationary part of the rig. Power supply to the balance bridges is also fed through the slip ring.