Abstract:
A new closed loop system is described which enables the incidence, roll and motivator (i.e. control surface) angles of a wind tunnel model to be controlled remotely, either by hand or by analogue voltages derived from, say, a computer. Besides operating from direct (polar) demands, the system correctly positions the model if the demands are referred to Cartesian coordinates, and in this case compensation for sting bending can be made automatically. The system is described in some detail and the results of dynamic performance measurements are given.
