Futaba 8UHFS, 8UHPS - Manual (Page 32)

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The Idle Down function lowers the engine idling speed when either the airbrake
switch (SW C) or landing gear switch (SW G) is activated. This function may be
used whenever you wish to raise the engine idling speed to prevent the engine from
stalling, and to lower the engine idling speed for landing.
Setting the IDL-DN function
1. Activate the IDL-DN by pressing the (+) key
("ON" or "OFF" will be displayed). You may turn off the
function by pressing the (-) key (INH will be displayed).
To F/S
function
To EXP function
Range: 0 - 40%.
Initial value = 0%
*The blinking item is what is
being set.
Data input keys
These keys are used to move
through items 1-3 in this menu.
Currently set
switch
2. Idle down throttle
Adjust the idle down position with
the (+)/(-) keys.
• If you're unhappy with your
setting, you may return to the
default value by pressing the (+)
and (-) keys simultaneously.
3. Select the desired Idle-down switch with the (+) and (-) keys.
Switch name and direction display
(SW-C C/DN, SW-G DOWN, SW-G UP)
• The "SW-C C/DN" display indicates that both the switch C
CENTER and DOWN positions activate the IDL-DN
function to lower the idling speed.
• The "SW-G DOWN" display indicates that the G switch in
the DOWN position activates the IDL-DN function.
• The "SW-G UP" display indicates that the G switch in its
UP position activates the IDL-DN function.
Normally, a value of about 10- 20% is suitable. Secure the fuselage,
and while running the engine, set the throttle stick to idle. Adjust the
idle down rate while flipping the switch ON and OFF.
The Fail Safe function is used to prescribe what the PCM receiver will do in the
event radio interference is received. In this menu, you may select from one of two
options of operation for each channel. The "NORM" (normal) setting holds the
servo in its last commanded position, while the "F/S" (Fail Safe) function moves each
servo to a predetermined position. The default setting is NORM (normal) for all
channels.
The use of the fail safe function is recommended from the standpoint of safety.
You may wish to set the throttle channel so that the engine idles when there’s
interference. This may give enough time to fly away from and recover from the
radio interference. If you choose to specify a failsafe setting, the fail safe data are
automatically transmitted once each minute.
Battery Failsafe
Your system provides a second safety function called Battery Failsafe. When the
airborne battery voltage drops below approximately 3.8V, the battery fail safe function moves
the throttle to a predetermined position.
When the battery failsafe function is activated, your engine will move to idle (if you
haven’t set a position) or a preset position. You should immediately land. You may
temporarily reset the failsafe function by moving the throttle stick to idle, at which time you’ll
have about 30 seconds of throttle control before the battery function reactivates.