Futaba 8UHFS, 8UHPS - Manual (Page 84)

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The Offset 1, Offset 2,and Offset iv functions are used to offset (change the neutral
position) of the aileron, elevator, and rudder when switch G is used to switch to idle-up 1 (or
2) or switch F is used to switch to inverted flight. This function may be used to automatically
change the trim of a helicopter flying at high speed. A clockwise-rotation rotor helicopter
tends to drift to the right at high speed, so an aileron offset may be applied to offset the
helicopter to the left. You can use the DELAY function to make a smooth transition
between the differing neutral settings.
The necessary elevator offset varies with model geometry, so it must be determined by
noting pitch changes at high speed. The rudder offset is affected by both revolution mixing
(page 72), and trim (overall level movement) with the offset function. When the offset
function is ON, also the electronic trim levers will operate, so the trim amount in these flight
modes is automatically input to each offset amount.
The activating switches are initially set so that offset 1 and offset 2 are on at the same
time as the idle-up 1 and idle-up 2 functions, switched by Switch G. If desired, the offset
function ON/OFF operation can be changed to switch C. This may only be done in the
OFST-1 menu, and not in the OFST-2 menu.
Setting up Offsets 1, 2, & iv
To DELAY
or OFST-2
function
To OFST-1
or TH-HLD
function
Offset amount
Range: -120 to
+120%
(Initial value: 0%)
Data input keys
These keys are used to move
through the five submenus in
the OFST1 & OFST2
functions.
2. Aileron offset
Input the desired Aileron offset with
the (+)/(-) keys.
3. Elevator offset
Input the desired Elevator offset
with the (+)/(-) keys.
4. Rudder offset*
Input the desired Rudder offset with
the (+)/(-) keys.
• If you're unhappy with what you've
set, you may reset to zero by
pressing the (+) and (-) keys
simultaneously.
5. Switch direction selection
Select the desired switch and direction for the switch to turn the
function on and off with the (+)/(-) keys.
SW-E: Turns OFST1 & 2 on/off at the same time as idle-ups 1 & 2
SW-C modA: Switch C center position turns on OFST-1 and lower
position turns on OFST-2
SW-C modB: Switch C center position turns on OFST-1 and upper
position turns on OFST-2
1. Turn the OFST1, OFST2, or OFSTiv function ON or OFF by
pressing the (+) key ("ON" or "OFF" displayed depending
on switch G's or F’s position). Turn off (INH) the function with
the (-) key.
Switch direction display (SW-E,
SW-C modA, SW-C modB)
(Initial value: SW-E)
Channel display
AIL = Aileron
ELE = Elevator
RUD = Rudder
The screen below only appears in the
OFST-1 menu for switch setting.
The Delay function provides a smooth transition between the trim positions whenever
offset, revolution mixing, or throttle hold functions are turned on and off. You may set
different delay times for aileron, elevator, and rudder. With a 50% delay setting, the servo
takes about a half-second to move to its new position, quite a long time. Normally a 10-15%
delay is used.