Stall recovery using variable pitch in motion (VPIM) blades. Operating points at 70°, 60°, and 50° pitch angle with all data taken at a rotational frequency of 700 rpm. At 70° the fan is operating in a stalled condition, to the left of the characteristics peak pressure. At 60° the fan remains stalled, with the fan operating just to the left of the peak in its characteristic. At 50° the fan is operating in the stable part of its characteristic, to the right of the characteristics peak pressure [36].