22 Nov Telluric anemometer converter
The wind direction indicator is an option of the Elisa C18 converter that should be installed to provide for the pilot some wind direction and speed information near the airstrip.
During a landing, the airstrip is most often facing the wind to create a relative wind. In mounting or on a moving warship can be in a rough air, inducing a significant aerodynamic wake. There is first of all the wind of the free atmosphere which depends on climatic conditions. A relative wind is created due to the composition of the free wind and the displacement of the warship.
- The free wind is counted in knots. Its meaning and intensity are important in terminal approach phase.
- The relative wind interacts with the body of the aircraft carrier or the mountain as well as with its superstructures, to create the wake.
This wake consists of stationary and unsteady flows, which are highly dependent on the angle between the wind
Relative and the center line of the runway. The geometry of the environment can generate a zone of fluid in depression at the origin of vortices that go either to meet the superstructure or to meet another vortex. At longer distances, this geometry may imply for the aircraft, first a lift, then an aspiration along the vertical axis. The superstructure contributes to the wake by generating a vortex disturbing at the approach because side is located on the terminal trajectory. Unsteady effects are enhanced when there are variations in the attitude and heave of the ship generating low frequency oscillations in the vortexes.
What is an anemometer
It is a manometer calibrated to Bernoulli’s law which converts a difference between total and static pressure pressure rate that is the speed of the aircraft relative to the air. It is usually measured in knots, but, a few French aircraft and on Russian aircraft, it is given by kilometers per hour.
The anemometer gives the indicated speed (Vi) or read speed.
This speed is the proper speed (Vp) or true airspeed to the pressure 1013.25 hPa (at sea level in standard atmosphere) and the temperature 15 ° C. With the decrease in air density, so in amount, the own speed is exceeds the specified speed (an approximation can be made by adding 1% per 600 feet above the surface 1013 hPa).
The wind direction indicator is an option of the Elisa converter that should be installed to provide the pilot of wind direction and speed information near the airstrip.
- The anemometer is integrated to paint marking of the landing field, it remains visible to the pilot when the aircraft is at a TLOF maximum distance of 1500 m.
- Night operations are illuminated by the painted grounded.
- Use certified equipment FAA L-806, L-807 or in accordance with Annex 14 Volume II -. 5.1.1.
To survey dynamics of each landing, the elisa’s FATO collect environmental
data such as flight’s kinetic, airstrip’s relative movement, aircraft type, weather and traffic condition.
From its environmental information, painted beacons submit
an appropriate visual guidance for a selected aircraft in approach.
So, pilot can see the direction and strength of wind from the ground from much far away than any windsock.
The Electro Luminescent Intuitive Signal for Aviation (ELISA) system is based on a polymorphic beacon placed, depending on its application, on the shell of taxidrone carrier, marking painted on the station, AMX tank transport canvas, soldier helibag. To display wind & force direction from the converted surface, just add-on anemometer to your Elisa converter. Your custom lighting equipment become an equivalent of the windsock.
However, Elisa system is a derivative of a weather radar and has the following operating mode: the transponder of the aircraft will issue a request which will be received by the FATO ELISA symbiote in order to estimate the local weather at the level of the ” Heliport / Taxidrone station / airtrip.
Scroll to change simulate a wing direction changing
Taxi drone station marks change light sequence in function of the wing direction and velocity
The measurement of wind velocity is obtained by a frequency modulation of the signal of the ELISA beacon and the direction of the wind indicated by the orientation of the beaconing. Other subsystems complete this function in order to improve the measurements. Depending on the application, this sensor will be used during the initialization phase of the vision algorithms. However, the accuracy of the ELISA diurnal anemometer system is limited to ± 1 degrees in angle and ± 0.1nm in distance afterwards.