JetCat P80 Instruction Manual page 39

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,
Golden West Models and 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.
Fuselage
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> 2 inches