FUTABA 8US, Instruction Manual

Page: 27 / 99

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14. Throttle Curve Setting: move to the TH-
CRV IDL2 menu and activate with the (+) key.
Input the trial throttle curve points as shown
below:
Point
1 2 3 4 5
Setting (%) 60 60 60 75 100
15. Pitch Curve Setting. Step through the
menu to the PI-CRV IDL2 menu. Set the pitch
curve as follows:
Point
1 2 3 4 5
Setting (%) 5 25 50 65 80
Blade pitch -3° +4.5° +8°
16. Idle-up 2 Revolution Setting:
These settings are used in rolls. Move to the
REVOLU IDL2 menu and try out the following
values for the rudder mixing curve:
Point
1 2 3 4 5
Setting (%) -20 -10 0 +10 +20
Throttle Hold Settings
The settings for HOLD conditions, to be used
for Autorotation, are also among those contained
in the Advance menus (see the menu structure on
p. 21).
17. Revolution Throttle Hold Setting:
TH-HLD sets throttle position near idle and
keeps the model pointed straight ahead during
autorotation. Move to the Throttle Hold menu
and activate by pressing the (+) key, then set
switch G to the forward position. Set the hold
position (HLDP) maintain engine idling.
Next, move to the rudder offset setting and set
OFST to keep the tail rotor pitch angle to nearly
0°, since there is no torque. Your numerical
value may vary from those shown.
18. Pitch Curve Setting. Move to the PI-CRV
HOLD menu and activate. During autorotation,
high pitch is used at both the HIGH and LOW
sides, so set the HIGH and LOW rates to their
maximum values: 0 and 100% respectively.
Point 1 2 3 4 5
Setting (%) 0 25 50 65 100
Blade pitch -4° +4.5° +12°
19. Rudder
o
Throttle Mix Setting
Rudder
o
Throttle mixing is useful for
hovering eight, nose-in circle, Top Hat, Pirouette,
and other aerobatics. It is normally set up so that
rotor speed is maintained to keep altitude constant
when the rudder stick is operated at half-throttle.
For helis with normal rotor rotation,
commanding right rudder should increase throttle
slightly, while using left rudder should decrease
throttle slightly.
To set this feature, use one of the PMIX
mixers. Press the (+) button to activate it, and set
master = Rudder, slave = Throttle. Input the
value for left at -10%, and the right value to +10%.
Adjust values to suit.
Another use for a programmable mixer
The main rotor’s RPM can decrease due to
increased loads whenever full cyclic control is
used, like when doing a roll. To help keep the
RPM up, you can use a mixer with Master = AIL,
Slave = THR. About 10% mixing is a good
starting point for both directions.
20. Trim Offset Setting
The Trim Offset menus may be adjusted for
Idle-up 1 and Idle-up 2. Aileron, elevator, and
rudder trims may be offset to different positions so
that the model flies straight ahead during normal
flight.
If you find you need some trim offsets in
IDL1 or IDL2, call up whichever of the OFST-1
or OFST-2 menus you need. Recommended
settings for aileron and elevator offsets are small,
from 6% to 10% or as needed.
Rudder offset is set by the Revolution
Throttle Hold function set previously, so is not
included in this menu.
21. Delay Settings
Delay settings are used to prevent sudden
trim changes due to different settings in different