Futaba 8UHFS, 8UHPS - Manual (Page 63)

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BFLY — Butterfly Mixing (“Crow”)
The Butterfly mixing function – sometimes called “crow” – is used for glide path control for landing
or for limiting speed when in a dive. Butterfly mixing is controlled with the throttle stick and raises the
ailerons and lowers the flaps (two aileron servos are required, using CH1 and CH7, and the same setting
applies to both, so horns must be identical). Butterfly will work with either one or two flap servos. All
of the servos move linearly with throttle stick motion.
Butterfly mixing can generate a change in pitch, so the elevator may be adjusted to compensate.
Sudden changes in pitch can be suppressed by setting the delay ("DLY") item at the elevator: a 100%
delay means that the elevator takes about two seconds to go to full travel.
Butterfly mixing is manually turned on and off with Switch A. If you turn on the transmitter, and
there’s a beeping sound, it could be your butterfly activation switch is in the ON position.
At the throttle stick “idle” position, butterfly mixing has maximum throws. [If you wish to move
the ATL to the high throttle end, turn on the transmitter holding the two buttons down (or the two
BASIC or two ADVANCE MENU buttons). You’ll see a display “STICK MODE x.” Press the
lower
button to get to the “TH-FNC” display. Now press the minus (–) key to reverse
the throttle function. You may need to reverse the signs on some mixers after you perform this
operation, which applies to all model memories.]
Butterfly mixing programming
To ELE-FL function
(GLID1FLP) or
FLP-AI (GLID2FLP)
To AI-DIF function Data input keys
These keys are used to move through the
six submenus in the BFLY function.
1. Turn the BFLY function ON by pressing the (+) key
("ON" or "OFF" displayed depending on SW-A position).
Turn off (INH) the function with the (-) key.
Servo travel
Range: -100 to
+100%
Initial value: 0%
2. Set Aileron travel setting
Input the travel you'd like with
the (+)/(-) keys.
3. Set Flap travel
Input travel with the (+)/(-)
keys.
4. Set Elevator travel
Input travel with the (+)/(-)
keys.
• Press the (+)/(-) keys
simultaneously to return to the
initial value for the control.
Channel whose
throw is being
set:
AIL = Aileron
(shown)
FLP = Flap
ELE = Elevator
Throttle stick position for BFLY begin:
Range: 0 - 100%
(Initial value: 0%)
5. Set Elevator delay rate
• Adjust the elevator delay
with the (+)/(-) keys.
• A 100% delay produces full
elevator throw in about one
second
• Press the (+)/(-) keys
simultaneously to return to
0%.
6. Enter Throttle position
The throttle position you set becomes the
starting point for butterfly mixing. The
servo motions increase linearly when the
throttle stick passes this position towards
"low throttle."
Move the throttle stick to the desired
butterfly on/off position. Enter the
position into memory by pressing the
(+)/(-) keys simultaneously.
Set Throttle position
(a throttle on/off position must be set if
you use the linear (LIN) airbrake mode).
Shows that switch A turns the
BFLY function on and off.
Elevator delay value
Range: 0 - 100%
(Initial value = 0%)