FUTABA 8UHPS Instruction Manual page 45

The TH-CUT function is used to kill the engine at the end of a flight. The engine
can be stopped with one touch with switch F (the momentary trainer switch is the
initial setting, but you may select another). This function eliminates the need to
move the trim to kill the engine and then move back to the idling position after each
flight. When the throttle stick is lower than the function ON/OFF set point throttle
position (normally a little above idle), the TH-CUT function responds to the operation
of the switch, and the throttle servo moves to its defined position.
The TH-CUT function will protect you from accidentally shutting off the engine.
When the throttle stick is above the set point, the TH-CUT function is not activated
even if the throttle cut switch is operated. In addition, you must move the throttle
stick back below the set point before the TH-CUT function can be reset, to avoid
sudden engine acceleration.
TH-CUT setup
Hook up and adjust the throttle linkage so that full throttle fully opens the
carburetor, and use the digital trim to make the engine idle at low throttle. Turn on
the throttle cut switch (switch F) and select the amount of offset to be just large
enough in the "–" direction (low throttle) to fully close the carburetor.
If you prefer, you may select another switch and ON-OFF direction. For safety,
always activate the TH-CUT function and use it.
Setting up the Throttle Cut function
1. Turn the TH-CUT function ON or OFF by pressing the
(+) key ("ON" or "OFF" displayed depending on switch F's
position). Turn off (INH) the function with the (-) key.
Throttle position
Throttle Offset
Range: 0 - 100%
Range: -30 to
(Initial setting 5%)
+30%
(Initial setting 0%)
Selected
Switch direction display
switch
(NULL, UP, DOWN)
2. Input throttle offset
Adjust the throttle offset amount
with the (+)/(-) keys.
• If you're unhappy with what you've
set, you may return to the default
value by pressing the (+) and (-)
keys simultaneously.
3. Throttle-Cut activation position
Hold the throttle stick at the highest
throttle location you want to be able
to activate TH-CUT (normally set
near idle). Memorize the position by
pressing the (+)/(-) keys
simultaneously.
4. Activation Switch Selection
Select the switch with the (+)/(-) keys.
5. Switch direction selection
Select the desired direction for the switch to turn the function on and
off with the (+)/(-) keys.
UP = Upper position turns on TH-CUT
DOWN = Lower position turns on TH-CUT
NULL = TH-CUT is deactivated
42
These keys are used to move
through the five submenus in
the TH-CUT function.
To MODEL
function
To TRAINR
function
Data input keys