FUTABA 8UHPS Instruction Manual page 52

The Throttle Hold function holds the engine throttle in the idling position and
disengages it from the throttle stick, whenever switch E is activated. It is commonly
used during autorotation. You can set the throttle position to be held over a -50 to
+50% range centered about the throttle idle position. The throttle hold function also
includes a rudder offset option.
Rudder offset at throttle hold
The rudder offset function contained in throttle hold is used to offset the tail rotor
pitch neutral position during autorotation. It is set to keep the fuselage from rotating
only when the throttle hold function is active.
You may also input a time delay for the offset to be implemented (to prevent
sudden trim changes) in the DELAY menu within Advance menu.
Setting up Throttle Hold
1. Turn the TH-HLD function ON by pressing the (+) key
("ON" or "OFF" displayed depending on SW-E position).
The hovering pitch curve function is also activated. Turn off
(INH) the function with the (-) key.
Hold position
Range: -50% to +50%
(Initial setting = 0%)
Hooki up the throttle linkage so that the carburetor is opened
fully at high throttle, then use the digital trim to adjust the
engine idle position. To have TH-HLD maintain idle, move the
throttle stick to the idle position, then cycle the hold switch on
and off and keep changing the offset value until the servo does
not move. When you want TH-HLD to lower the engine idle
speed, or you want to stop, input a more negative number.
CAUTION
The throttle hold function has priority over the idle-up function.
Be sure that the idle-up and throttle hold switch are off before
trying to start the engine.
2. Enter Hold position
Adjust the position with the
(+)/(-) keys.
• Press the (+)/(-) keys
simultaneously to return to
0%.
49
These keys are used to move through the
four submenus in the TH-HLD function.
To OFST-1
To TH-CRV function
3. Rudder offset function
First activate by pressing the (+) key
("ON" or "OFF" displayed).
INH the function with the (-) key.
Rudder offset rate
(Range: -100 - +100%)
(Initial value: 0%)
4. Offset rate setting
Entire the desired rudder offset amount
with the (+)/(-) keys.
Data input keys