Hello to all,
It’s my first post here, I’m building an experimental plane, I was looking for solutions few days without success.
I recently crashed with some unusual issue. My drone (5 channel plane, 1+5 aileron, 2 elevator, 4 rudder, another channel for manual throttle control, T-tail) was in dive flight in AUTO mode, and it want to recover with pitch down output signal. It was -90 degrees dive flight and autopilot want to recover through inverted flight and then roll with ailerons to horizontal flight.
It was experimental flight with testing Vne speed and flatter durability. My plane don’t have exact +/- G’s durability. It’s less strong with -g force in Z axis (elevator forward/nose down).
Now I know that when in AUTO/FBWA mode and drone reach -90 degress, then autopilot in a moment change steering from pitch up to pitch down. In manned flight it is unusual to recover from dive to inverted flight through pitch down (elevator forward).
Is there possibility to change algorithm to make returns from dive to horizontal flight only with pitch up signal?
I’m flying with:
-cube black with SB, newest arduplane firmware and newest Mission Planner
-calibrated airspeed sensor
-motor turned off (throttle assigned to manual channel, without A/P control)
-plane tuned in auto-tune mode, servos properly configured, manual and auto mode tested (without double reverse problems).