Hi and thanks in advance for your thoughts.
I have been flying Pixhawks on fixed wing aircraft for years without too much trouble. Now I have trouble. I am attempting autotakeoff in AUTO mode using TKOFF_THR_MINSPD = 2 m/s, TKOFF_THR_MAX = 100%, TKOFF_THR_SLEW=100%. I run with the plane until the motor starts, then toss it. The problem is that the throttle is only 65% to 75% max throttle at ~1750 mS. (monitoring CH3OUT and CH3%). The value changes, suggesting that someone in there is calculating CH3, instead of nailing it at 100%. If I switch on the RC transmitter and apply full throttle, the motor outputs 100%. SERVO3_MAX = 1900. If I increase SERVO3_MAX, CH3_OUT increases. THR_MAX=100%, STICK_MIXING = 0. Mission Planner shows navigation to WP1. WP1 is a TAKEOFF instruction.
I have been through the entire parameter list in an effort to find where I may have limited the throttle to less than 100% without success.