Airspeed Sensor
The optional Airspeed Sensor consists of a pitot tube and a precision, differential
pressure sensor. By sampling the ambient air temperature, the current flight speed of
the model is calculated by the ECU, from the measured difference in static versus
dynamic pressure.
When the ECU is used without the Airspeed Sensor, it is set in thrust control (normal)
mode. In this mode, the throttle stick directly alters turbine thrust.
When the Airspeed Sensor is plugged into the ECU, it automatically establishes speed
control mode. In speed control mode, the turbine thrust is automatically controlled – to
keep the model at a predetermined speed and/or to limit the model’s maximum speed.
Speed control mode features several functions:
• Measurement and storage of maximum and average flight speeds
• Automatic restriction of maximum flight speed
• Maintenance of current flight speed (fixed "Cruise Control”)
• Regulation of flight speed, analogous to throttle stick position (adjustable
"Cruise Control”)
To display the maximum speed the user is allowed to set the speed control can
be displayed on the GSU when powering up by holding down the Info key. This
can be used to verify that the system cannot be set higher then the maximum
AMA allowable speed.
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