Appendix; Airspeed Sensor - GRAUPNER JetCat P60 Instructions D'utilisation

[Seite 37]

Appendix

Airspeed Sensor

The airspeed sensor is an optional accessory which can be connected to the system, and consists of a pitot
tube and a precision differential pressure sensor. The ECU calculates the current airspeed of the model from
the measured differential pressure and the air temperature.
Without the Airspeed Sensor connected, the ECU always operates in what is known as "thrust control"
mode. In this normal operating mode the pilot directly controls the turbine thrust using the throttle stick.
With the Airspeed Sensor connected, the ECU can also be switched to what is termed "Speed control" mode
(= airspeed governing). In this mode the ECU automatically adjusts the thrust of the turbine so that the model
reaches and maintains a nominal airspeed which has been pre-selected by the pilot.
The airspeed information can be used by the ECU subsequently for various functions:
Measuring / storing the maximum and average airspeed.
Measuring the distance covered in flight in km.
Automatic limiting of the maximum permitted airspeed of the model.
Airspeed
Sensor
Regulation of the model's airspeed, proportional to the throttle setting (= "Speed control" mode)
Maintaining the current airspeed (= "Hold-speed" mode).
Connection diagram for the airspeed sensor
The air pressure connections 1 (= air pressure) and 2 (= ambient pressure) are completed using the air lines
supplied. The length and cross-sectional area of the tubing do not affect the accuracy of the measurement.
static pressure
2
(statischer Druck)
air pressure
1
(Staudruck)
ECU connection cable
(Anschlußkabel zur ECU)
2
1
35
flight direction
(Flugrichtung)
pitot-tube
(Staurohr)