HITEC OPTIC 6 - CROW - Crow Mixing (Airbrakes)

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A
irplane Model Function Descriptions
ON or OFF depends
on Flt. Mode switch
setting
2. Press the Cursor Right key to get the percent sign flashing,
then
press the Data +Increase and -Decrease keys to
increase
or decrease the amount of mixing. Check the
direction
the flaps move with elevator stick: with up elevator,
the
flaps should droop downwards, and for down elevator
they
should come up. In other words, they should move
opposite
the elevator motion. If they don't, use the Data
+Increase and -Decrease keys to change the sign in front
of
the percentage number. You should probably start with
a
smaller number (say 20% or so) and slowly increase it to
learn
how the model reacts. Remember the position of the
Flt. Mode (SW-4) switch turns this function on and off (fully
aft
turns it ON ).
drag) occur at "low" slider position (towards the bottom of the
transmitter).
The selected ON-OFF switch must be ON for
Crow
to operate. Note: activating CROW automatically turns CH5
into a second aileron
servo, and CH6 becomes a flap servo commanded by the Right
slider if FLPT is not set to zero.
Setting Up Crow Mixing
1. Start by locating the CROW menu with the Up Down Edit
keys. Either the ON or OFF display will be flashing,
depending
on the position of the Gear switch SW-2
(forward is on).
2. First set the CROW function activation point. Hit the Cursor
Left key one time to get to the SET menu. Now move the left
lever
all the way up. Enter that position by pressing the Clea
r
Active/Inhibit key. The display should read a number
around
+125%.
CROW
-
Cro
w
Mixing (Airbrakes)
The Crow mixing function is useful for increasing the drag of
a model during landing approaches, which makes the approach
steeper
and slower, making landings shorter and easier. This
is
especially useful for stunt planes and sailplanes to help make
precision
landings. You may select the switch that turns on
the Crow function, and the function is commanded
proportionally by the Left Lever position. You can move the
lever
a small or large amount and get a small or large travel
(unlike Camber which provides a fixed amount of motion).
Ailerons,
elevator, and flaps are the three controls that are
commanded
by Crow function, which is also called "butterfly"
in
the sailplane world.
3. Make sure CROW is ON by moving the Crow on-off switch
to
its ON position . Verify by looking at the flashing ON/OFF
indicator.
Either the ON indicator or the OFF indicator will be
flashing,
depending on the position of the ON-OFF switch
that
is selected. See the Switch Select instructions on
P. 39 for information on how to select the ON-OFF switch.
4. Next, set up the throws for the first aileron. Press the Cursor
right key two times to get to the aileron setting menu
(a small arrow will appear over the number 1 in the display).
Press
the Data +Increase or -Decrease keys to adjust the
amount
of aileron motion. Move the Left lever all the way
down
and be sure the ailerons go UP . If they don't, press the
Clear Active/Inhibit key and then press the Data keys
change
the sign. You'll probably want a fair amount, but not
all,
of aileron travel. Be sure not to use full travel, so you'll
have
roll authority while on approach in full crow command.
Notice
that you set the throw for both ailerons at the same
time:
this is the reason to have identical control arm lengths
and
identical neutral positions.
The idea of the crow function is to simultaneously raise the
ailerons
(which reduces the wing's lift), and drop the flaps (to
regain
the lift lost by the up aileron movement). Elevator motion
may
also be also commanded if needed to prevent a trim
change
induced by the flap and aileron motion. Normally, crow
is
set up so that the maximum control movements (maximum
Airplane Model Function Descriptions - Page 37