Patent ID: 8942867
Filing Date: 2015-01-27
Classification: B64D,B64F,G01P

Abstract:
1. A procedure for calculating and displaying current airspeeds of a specific rotorcraft in low-speed evolutions, with the current airspeeds consisting respectively of a longitudinal current airspeed LAS Vx and a lateral current airspeed LAS Vy , the procedure including: an operation for the development of a calculation rule for the current airspeeds, which development operation includes a test-flight operation on board a rotorcraft and an operation for the integration of the calculation rule into a calculator associated with measurement instruments on board the specific rotorcraft; and an operation for executing, during flight on board the specific rotorcraft, the calculation rule for determining the current airspeeds based on measurement information provided by the measurement instruments of the specific rotorcraft, and an operation for displaying the current airspeeds through display means on board the specific rotorcraft; wherein: a) the operation for executing the calculation rule includes: the development, by means of a construction calculator, of a pair of first polynomial laws for the calculation of estimated airspeeds, comprising respectively an estimated longitudinal airspeed V the development, through test flights by means of the construction calculator in conjunction with a test-flight calculator which itself is associated with measurement instruments on board a test rotorcraft that is a member of the family, of a pair of second polynomial laws for the calculation of the airspeeds of the test rotorcraft, as determined through multilinear regression by means of the construction calculator, based on the estimated airspeeds, namely the estimated longitudinal airspeed V b) the integration operation including the integration into an execution calculator of the first polynomial laws and of the second polynomial laws, with the integration operation being followed by an operation for associating the execution calculator with the measurement instruments located on board the specific rotorcraft; c) during the execution operation, the current airspeeds are determined based on measurement data generated by the measurement instruments, through the execution of the first polynomial laws enabling the calculation of the estimated airspeeds, consisting respectively of the estimated longitudinal airspeed V d) during the final display operation, the display means, which are in communication with the execution calculator, display the current airspeeds, consisting respectively of the longitudinal airspeed LAS