A device suitable for the implementation of 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 LASVx and a lateral current airspeed LASVy, 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 Vx and an estimated lateral airspeed Vy for a modeled rotorcraft in a family to which the specific rotorcraft belongs, with the first polynomial laws being constructed through multilinear regression by the construction calculator, based on parameters relating to simulated flight points defined by means of a flight simulator;
- 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 Vx and the estimated lateral airspeed Vy, as obtained through the application of the first polynomial laws to parameters relating to points in the test flights, as performed on board the test rotorcraft, on the one hand;
- and based on the longitudinal airspeed LASVx and the lateral airspeed LASVy of the test rotorcraft as obtained b means of the measurement data provided by the measurement instruments located on board the test rotorcraft;
- 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 Vx and the estimated lateral airspeed Vy, and then through execution of the second polynomial laws adjusting the estimated airspeeds;
- and
- 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 LASVx and the lateral airspeed LASVy, of the specific rotorcraft, wherein the device includes the constructing means for the calculation rule and the means for the execution of the calculation rule both being located on board a specific rotorcraft, the construction means including:
- a flight simulator that generates the parameters relating to simulated flight points;
- an in-flight test calculator that generates the test-flight parameters;
- and
- a construction calculator that is suitable for developing, through multilinear regression, the pair of first polynomial laws, according to the simulated flight points and suitable for developing, through multilinear regression, the pair of second polynomial laws, doing so through the application of the first polynomial laws in accordance with the test-flight parameters.