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CROW (Glide-Path and Airspeed Control)
CROW (Glide-path and airspeed control)
(CROW raises the ailerons and lowers the flaps when you move
the left-hand joystick toward the bottom of the transmitter case)
In this screen you can activate the CROW air-brake and glide
path control function and set the values for the aileron, flap and
elevator servo movements. The more CROW you apply during
the landing approach (with the left-hand joystick), the more the
glide path steepens and the glider slows down. Because you
can regulate the amount of CROW, you can precisely control
where and how slowly the glider lands-an important factor for
landing on limited-length runways (gliders are generally a lot
more "slippery" than power planes!) and in contests where you
are rewarded points for landing on a target.
CAMB (Wing Camber)
CAMB (Wing camber)
!
Tip
While the Camber function also appears in the ACRO menu,
the use of this feature is significantly different for Sailplanes
than it is with Power planes. Please refer to the instructions
below to understand how to make the most effective use of
Camber on your Sailplane.
A solid understanding of the Flight condition feature will help
when programming wing Camber.
Optic 6 Sport - Page 34
!
Tip
You must have A.DIF activated for ch. 5 to appear on the
CROW screen
Setting up CROW
1) Activate the function by pressing both DATA buttons
simultaneously.
2) Watching the motion of the control surfaces on your model,
set the value for each of the servos with the left-hand joystick
pulled all the way to the bottom of the transmitter case.
Begin with the aileron servos in CH 1 and CH 5: Unless the
servos buzz and stall, set both ailerons to rise to approxamatly
50% of their travel. Don't make this value too large, as you still
need to control the aircraft's roll rate with the ailerons.
upward (Note that you can go to a negative value % to
reverse the direction of the movement of one of the aileron
servos if necessary).
3) Set the flap servo on CH 6 to 75% of their travel (If you have
two flap servos, they should be connected with a Y-harness
to the channel 6 slot on the receiver)
4) Finally, curser to CH 2 and set the elevator travel value so
the elevator moves down just a bit for pitch control: 15% is a
good starting point, though in-flight testing is necessary for
making true, final adjustments.
SAFETY WARNING: When checking out the in-flight response
of your model to the crow settings, be sure to first gain at least
200 feet of altitude to allow time for you to recover from any
loss of control.
When flying gliders featuring modern, thin airfoils the ability to
change the shape of the airfoil by reflexing (raising) or
cambering (lowering) the trailing edge in combination with
making simultaneous, slight changes in elevator trim is crucial
to optimizing the performance of the model in a variety of flight
conditions and tasks. The Optic Sport offers a selection of up
to four flight condition modes in which you can program varying
amounts of aileron, flap and elevator trim (as well as dual-rate
and exponential values). These modes are activated by either
switch SW-3 or SW-1.
A typical example for setting up a discus-launched glider for
optimum performance would consist of these three flight modes
(which are all assigned to SW-3):
CAMB (Wing Camber)
Launch: When switch SW-3 is pulled toward you the ailerons
and flaps will rise together slightly to "reflex" the airfoil for
high-speed flight and the elevator will kick up a few degrees to
rotate the model vertical in the first 5 seconds or so of flight.
Cruise: When you push switch SW-3 to the middle position,
the ailerons and flaps will come even with the trailing edge and
the elevator will move down very slightly (relative to its normal
angle of incidence). This allows the glider to quickly fly between
thermals and through areas of sink.
Thermal: With the SW-3 switch pushed away from you,
the ailerons and flaps will droop down 3/6-in. and the elevator
will come up a few degrees from its normal angle of incidence.
This is the mode to be in when you suspect you have hooked
into a thermal. The glider is now at its lowest sink rate and can
fly just above a stall to allow you to turn tightly and keep in the
small core of the thermal.
Setting up flight mode wing camber and elevator
compensation
1. The first step is to leave this screen and move down to the
Flight Condition (FLT C) screen in order to put the wing
camber and elevator action of each mode on the
three-position SW-3 "FLT Mode" switch on the upper
right-hand top of the transmitter case. Use the Right EDIT
button to move down to the FLT C screen.
2. Now activate what will be the "launch" mode by moving the
switch position toward you and then hitting both DATA buttons.
The "Inh" symbol will change to "On" and ST2 will be blinking.
Move the switch all the way back and, in the same way,
activate switch position ST1 which will become our "thermal"
mode. The middle, normal position (NOR) is "cruise". You can,
of course, reverse the launch and thermal positions to what
feels intuitive to you.
Optic 6 Sport - Page 35
3. Now scroll back up to the CAMB screen with an EDIT button
and move the switch SW-3 toward you to the "launch" mode
position. Turn your model on so you can watch the control
surfaces move.
4. With CH 1 blinking, change the servo's travel value with a
DATA button until the right wing's aileron comes up to the
airfoil's reflex position. (Note: Ask the manufacturer of your
glider for their recommendation for reflex-and thermal-trailing
edge positions).
5. Using the right-hand CURSOR button, move to CH 2 and
adjust the travel of the elevator upward a few degrees.
CURSOR to CH 6 and reflex the left wing's aileron.
If your trailing edge also has flaps, CURSOR to CH 5 and
change their value to match that of the ailerons.
6. Now move switch SW-3 to the center, normal position and
follow the same process to set the trailing edge control
surfaces and the elevator to the appropriate values for the
"cruise" mode.
7. Finally, move SW-3 to the thermal position and adjust all the
values there. When done, move away from this screen
and/or turn off the transmitter. As always, plan on adjusting
the trailing edge and elevator settings in the CAMB screen
after flight testing to optimize their affect on performance.
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