Designing Purpose-Built Drones for Ardupilot Pixhawk 2.1

TECS tuning

First, you should have a stable tune as outlined earlier for your aircraft before doing TECS tuning. This is a process where you'll need two people: One pilot and another person watching the telemetry from the aircraft (specifically the airspeed most of the time). All of these settings need to be altered in the parameter list.

Here are the initial steps (use FBWA mode for this):

1. Set the maximum throttle percentage (THR_MAX). This is the throttle required to still climb at your set cruise speed (TRIM_ARSPD_CM) at your maximum pitch angle (default 20 degrees). The default of 75% works for most aircraft. But lower speed craft may require more, while ballistic aircraft (which can climb straight up) may require less. Fly at the maximum ...