Patent ID: 7941250
Filing Date: 2011-05-10
Classification: G01P

Abstract:
1. A method of obtaining a predictive vertical speed v AP of a rotorcraft, wherein the following steps are performed in succession: measuring an instantaneous vertical speed v of a rotorcraft using a vertical speed indicator connected to the rotorcraft; measuring an instantaneous proper airspeed of the rotorcraft using at least one of an omnidirectional air data system in communication with the rotorcraft, an airspeed indicator connected to the rotorcraft, and a global positioning system in communication with the rotorcraft; determining a corrective vertical speed v adding the corrective vertical speed v wherein said predictive term C P1 is determined as follows: where: V V V k=a predetermined characteristic constant of the rotorcraft, determined from a linear approximation that corresponds to a proportionality ratio between powers and vertical speed of the rotorcraft.