My task is to test 2 different flying wing at relatively high speed (16 m/s) in order to find which is more energy efficient for payload lifting (1.5kg). I have manually tested the airfoils at those speeds and they fly well. Being new to ArduPlane, I have started looking into Loiter mode in order to automatically test them on a fixed circle path and for a certain amount of time. However I want the wing to stay at a constant altitude and the speed to be (relatively) constant during Loiter. Those two parameters being fixed I suppose that the only variable the auto mode will be able to play with is the angle of attack (the cost being increased drag). How can I achieve this, and what parameters can I use, as I am a bit lost with all the different settings? I have already tried Loiter but using stick mixing for throttle control in order to maintain altitude, this time I want the speed to be automatically controlled as well as altitude.
Thanks for the help!
NOTE: I have an airspeed sensor configured