Moi,
If I'd do a "lecture" on heli setup (3D heli i.e. T-Rex), it wouldn't last more than 10 minutes:
* Start with a blank program on the radio, all trims / subtrims nulled
* Program 0-50-50-50-100 pitch curve. Please, don't try to fly this
If you have an unused flight mode, put it there for later setup use and disable for flying.
* Set collective midstick (on "50")
*
Attach servo horns horizontally / at a 90 degree angle to the linkage (With the recommended length, you usually get both at the same time).
With a two-ended horn try both directions, with a four-sided horn all four. One side comes closest.
Push-pull links must be
parallel.
* Use
subtrims on all three servos to center them perfectly
* Check that the
rotorhead links above the swashplate are at the correct length (
manual).
Really check this, you may be surprised.
* Set the three
links below the swashplate so that the
swash is level AND the blades are at
zero degrees.
Put on blades and fold them to one side. Seen from the side, they must be
exactly aligned.
* Set collective to max (100 on the curve, careful with binding, don't toast the servos). Go to the swash menu and
adjust collective mixing so that you get the desired
maximum pitch, i.e. 13 degrees or so.
* Set collective to min (0 on the curve). The pitch should now be the "mirror image", i.e. -13 degrees.
If max and min pitch differ substantially, check for setup mistakes. One can use a couple of percents of servo endpoint adjustment to get it equal, but usually it's not needed.
* Program pitch curve as desired, for example
40-x-50-x-80 for an "asymmetrical" normal mode. For example...
10-x-50-x-90 for 3D
0-x-50-x-100 for throttle hold
* Blade tracking:
- find
which blade runs low and which runs high
- set 50 on the pitch curve.
- Fold back the blades. Is there more negative pitch, or more positive pitch (if it happens to be "perfect", it doesn't matter).
- If "center pitch" is too high, lower the blade that runs high
- otherwise raise the lower blade
- repeat until it tracks.
(Why? Because "center" pitch remains always centered this way. This is the #1 beginner mistake, adjust blade tracking several times and the pitch wanders all over the place).
And that's it. Time: 7 minutes, leaves us 3 for the gyro