Eagle Tree OSD Pro - Manual (Page 19)

Copyright © 2009-2012 Eagle Tree Systems, LLC
http://www.eagletreesystems.com
Page 19
Move your Rudder/Aileron stick to the position you use for making a normal left turn. Don’t give more left stick than you would do normally
during flight! The OSD Pro’s RTH function will never exceed the rudder/aileron left turn stick position you set here, or the corresponding right
turn position, when it attempts to steer the model. So, the amount of left stick you supply will set the maximum throw of the aileron/rudder during
RTH. NOTE: during this step, the OSD Pro also examines the elevator position. If your radio is programmed for elevator aileron mixing, it will
be detected during this step, and a proportional amount of up elevator will be applied during RTH turns. If your radio does not do this mixing,
but you desire RTH to provide up elevator when turning, move your elevator stick to the desired amount of climb (corresponding to full
Aileron/rudder stick left) during this step.
•
Mov Elev TX STICK Down(Climb): During this menu step, after releasing the Aileron stick, move your elevator stick downwardly. How much you
move the Elevator stick during this menu item depends on whether you are using the Guardian. If you are using the Guardian, move the stick all the
way down (see Guardian manual for more information). If you are not using Guardian, the following information applies:
Move the Elevator stick downwardly, to the position you would use for normal climb. Don’t give more down stick (climb) than you would do
normally during flight! Note that this step results in up-elevator. The OSD Pro’s RTH function will never exceed this elevator up position, or
the corresponding elevator down position, when it attempts to climb or descend the model. So, the amount of down stick you supply will set the
maximum throw of the elevator during RTH.
•
Set Throttle for Motor Off: During this menu step, after releasing the Elevator stick, set the Throttle stick to the position which turns off the motor.
Note that if you are using Failsafe Safety Mode, the throttle position you choose in this step becomes the position the OSD Pro will use for the throttle
when in failsafe mode. IMPORTANT: note that if RTH is invoked, and the GPS signal is not adequate, the OSD Pro will set your throttle to this
position. Therefore, if your model is on the ground, and you turn off your transmitter or test RTH, your throttle could be put in the Motor
Off position. If full motor off is not chosen for the Motor Off position, your motor will start!
•
Set Throttle for Climbing: Set the Throttle stick to the position you would normally use for climbing the model.
•
Wizard complete. Click SELECT: This is the last page of the wizard. Click the Aux2/Select switch to return to the Safety Configuration Menu
Engaging RTH for Testing During Flight
There are 3 methods for engaging RTH during flight for purposes of testing:
a) Setting the “Test Return to Home” on-screen menu item, on the Main Menu. The options for this menu item are:
a. “None” (RTH test mode not enabled)
b. “Altitude” (only the throttle and elevator are controlled by RTH)
c. “Heading” (only the ailerons or rudder are controlled by RTH)
d. “Both” (all surfaces controlled by RTH in this test mode)
Using the menu option to test RTH lets you test each subfunction separately, but requires you to be able to access the menus during flight, which
requires confidence and good piloting skills. Also, when using the test mode, moving the sticks disengages RTH temporarily - this can make testing
easier.
b) Recommended: If you have set up your electric model’s throttle failsafe as described in the “Setting up RTH with Receivers that Support a
Throttle Failsafe” section above, you should be able to engage RTH during flight by throttling off, and then reducing your throttle trim until RTH
engages (when the throttle position reaches the failsafe position you programmed for throttle). Note that this method activates true RTH (not RTH
test mode). You’ll need to trim the throttle up to exit RTH mode when using this method.
c) If you set up the Option C radio stick input method as described in the “Choosing the Radio Stick Input Method You Prefer” section of the manual
above, moving the 3 position switch to the “up” position will trigger RTH test mode “Both.”
IMPORTANT: Never turn off your radio to test RTH in the air. There is a chance that your receiver will not link back up with your radio,
especially with spread spectrum radios, which could result in a crash. Always use one of the RTH test methods described in the manual for testing
RTH.
RTH Testing/Adjustment Procedures
Below are guidelines for adjusting the Return to Home feature to your plane.
a)
Initial setup and testing of RTH using the simulator (model on the bench with motor disconnected)
NOTE: Since you will not be able to see the throttle movements on electric models, consider temporarily replacing the ESC throttle input with a servo,
plugged into your receiver’s throttle output, and observe the movement of the servo as you move the throttle. A “Y” cable might be needed if the ESC
powers your receiver via the throttle connection.
1)
Configure the Radio Control and RTH menu settings and run the Servo Analysis Wizard, as described above.
2) Display servo deflection information, by turning on the “Display Servo Deflections” display item, as described above. This will display the
movement of the servos, relative to the “zero” points established for level flight during the Wizard. These values are displayed both in normal
mode, and safety mode.
3) Now, turn off your transmitter (with your motor disconnected!). RTH should engage, and the “RTH Engaged” message should appear on the
video screen. If it does not appear, check the settings you entered for your radio type, etc. Warning: never turn off your transmitter while
your model is flying!
4) Turn on your transmitter. RTH should disengage (the RTH message should disappear form the screen). If RTH does not disengage, check your
settings again.
5) Invoke the Flight Simulator from the Main Menu, choosing one of the flight simulator profiles that is most similar to your plane. Note: if you
have a model that uses elevon or vtail mixing, and you are NOT using unmixed inputs with the Guardian, choose “Funjet.” The message
“Flight Simulator Active” should appear in the upper part of the screen.
6) Now, the plane icon should move around the screen, and the displayed speed and altitude should vary, based on the rudder/aileron, throttle and
elevator transmitter settings. If the plane icon is not correctly turning, climbing, or changing speed based on your transmitter inputs, something