Manual Futaba 9ZHP_part2 (page 64 of 78) (English)

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Sailplane Section

BUTTERFLY MIXING (BFY)—4-S/5-S

Butterfly mixing, sometimes canned "crow"

mixing, is a way to get effective glide path control

without

using

spoilers.

The

butterfly

action

simul-

taneously raises the left and right ailerons and

lowers the speed flaps (brake flaps for 5-S).

The total travel can be adjusted by CH6 vol-

ume. The butterfly neutral position can be offset

from the center position. Butterfly mixing can be

turned on and off during flight by setting a switch.

If a switch is not set, mixing remains on all the

time.

5-S BUTTERFLY OPERATION

4-S BUTTERFLY OPERATION

Setting Up Butterfly Mixing

Butterfly is often controlled with the throttle stick,

but at initiation the control is assigned to the left knob

VR(A). The FNC command in the Model menu may be

used to change the assignment. In that menu, select SF2

with the J key, then press CTR. Select the throttle stick

by choosing J3 with the K key (null the CTR for airbrake

ABK

if you want). At this time, be sure that both

ailerons and speed flaps (or brake flaps for 5-S) move the

proper directions. The default speed flap control is the

left slider. If you use speed flap-aileron mixing, this will

become the camber control.

Activation of command

In the Condition Menu, press the

BFY

key to get the

BUTTERFLY menu, as shown in the figure.

Mode Setting

Press the

key to activate mixing, then press the

ACT

INH

key ( F or G ) to activate or inhibit the

butterfly function. When you activate, you will notice

two things: first, all four wing servos move, unless the

throttle stick happens to be at center. Second, the Alarm

light begins flashing. The alarm light is on whenever BFY

is active. This is OK, except the transmitter will beep if it

is on when first powered up. This is annoying, because

you can't stop it!

In just a moment, you will set the offset position for

the butterfly stick. The alarm light and beeping at startup

may be taken care of two ways: either an activation

switch may be defined, or the on position may be set

slightly away from the zero-butterfly position. In the

latter case, the function is off until the stick is moved

slightly.

Sailplane Section, Page 140

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Futaba 9ZHP_part2 Manual

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