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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 pos
ition 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.
> 2 inches
Fuselage