PAGE 51 of 54
Make sure the Airspeed Sensor is working, before using features that require a minimum flight
speed to operate. If the system is not operating properly, you may inadvertently shut off your
engine, in flight. To verify that the Airspeed Sensor is functioning, apply a little air pressure and
note the change in “Airspeed” on the run menu display.
Two examples:
Example 1 – Hold-Speed function
SpdCtrl SW0 Act assigned to “Hold-Speed” and AUX switch set in the SW0 position:
a) Flight speed is measured and stored, when the AUX switch is moved to the SW0 position. Thrust is
then regulated automatically, to maintain this memorized speed, despite the throttle stick position. This
regulator function is turned off immediately, by returning the AUX switch to the SW1 position (normal
thrust control).
b) If this function is activated while flight speed < 40 km/h, turbine will shut off, immediately (normal Off
function).
Example 2 – Linear speed regulation
SpdCtrl SW2 Act assigned to “Lin-SpeedCtrl” and AUX switch set in the SW2 position:
Cruise Control mode becomes active, featuring linear speed regulation to the throttle stick
position.
a) The minimum throttle stick position corresponds to the parameter “Min AirSpeed” and the maximum
throttle stick position corresponds to the parameter “Max AirSpeed”.
b) If flight speed < 40 km/h when this function is activated, the turbine will shut off (normal AutoOff
function).
Airspeed Sensor Mounting:
Experiments indicate that the Airspeed Sensor is more accurate when the pitot tube is side-mounted on the
widest part of the fuselage. In this configuration, the pitot tube should stand off from the fuselage, by at
least two (2) inches. Because each model installation is different, JetCAT will have additional mounting
information for review, as auxiliary data becomes available.
Hold Speed and Cruise Control limitations:
Under normal circumstances, the Airspeed Sensor is primarily used for limiting the maximum flight speed
and/or recording the maximum and average speeds of the model. Nonetheless, Hold Speed and Cruise
Control modes are clever additions. These modes require evaluating and adjusting the PID parameters in
the limits menu, while flying the model with a different technique. The slower reaction time of the throttle
response necessitates executing smoother patterns, with limited pitch changes. Experimenting will identify
how the turbine will react and help ascertain how to compensate for its limitations.
To Next Page
Loading...
Need help?
General
