Patent 7783395 was granted and assigned to Rolls-Royce on August, 2010 by the United States Patent and Trademark Office.
A control system for lift-generating unit, the control system comprising: detector unit for detecting at least one parameter from which stall may be calculated; scaling unit for determining a scale factor dependent on the or each detected parameter; and multiplier unit for multiplying an incoming lift demand signal by the scale factor to provide an outgoing lift demand signal.