Jet Central Rabbit, Operation And Maintenance Manual

Page: 26 / 44

January, 2009 25
With the I.C.S. in start mode, that is to say, just started, locating the trim and the stick at lower
side the LED must be off. When raising the trim slowly, the LED must light approximately to
half of the throw of the trim. From this point the
I.C.S. considers that the motor must be
running and below this, stopped.
4.8.2 Throttle Curves
By default the I.C.S. controls the RPM in linear way. I.E., at the half stick position the engine
turns at half of the rotor RPM range. Jet engines develop the thrust in exponential mode, thus
half RPM means approximately 1/4 of thrust. On small engines with a high idle to full power
RPM ratio, or in a high drag/low power planes, often only the last 1/3 of the throttle stick
produces significant thrust, with the low half stick travel being not used. Although that with
current digital TX the pilot can modify the throttle curve to suit its needs, from version 5.48
three throttle curves have been added to simplify the setup for most of the installations:
FULL EXPO: Means linear RPM, it is the default setting and the mode used for all previous
software versions. Thrust develops exponentially, and it is the recommended
curve for big engines and/or high thrust/weight ratio planes, as it eases the
control in low power used during taxi.
LINEAR: Means that the thrust develops linearly with the throttle settings. It could cause
difficult taxi, as it would be difficult to fine adjust the power at low settings.
HALF EXPO: An intermediate setting between the other two modes.
STICK POSITION
MODE 0% (idle) 25% 50% 75% 100%
FULL EXPO Idle thrust 6% 25% 56% 100%
% of total
thrust
HALF EXPO Idle thrust 16% 38% 66% 100%
LINEAR Idle thrust 25% 50% 75% 100%