hmmm ... sorry Alan, I was completely confused what the x, y and z is. I expected that your pull up is pull up from vertical to horizontal flight and thus y axis is longitudinal axis and thus I thought that -1g is what you expect to see just before that pull up
It did make sense, so I thought I understand.
Ok, I was too quick, so I will explain what I mean on that MY example. So imagine the model does a wingover. We have one sensor in longitudinal axis. I note that if its axis is perfectly tangent to the flight path and radius of maneuvers and we expect no drag changes in corners, then it can see only aerodynamic forces – in this case prop thrust minus drag.
So the question is what such a sensor sees during the wingover:
- after pull up – nose points up, prop thrust = drag sensor says 0
- little later – model is slower (because of gravity), prop thrust is little higher, drag little lower, senso see – say +0.1g (for sure more than 0 and for sure far less than 1g)
- on top of the hemisphere - model is slow, accelerating, sensor will see “some number”, could be easily close to 1g
- end of diving – modes is quick, but probably still accelerating and sensor sees number lower that -1g … say -0.5g
Now take data and try to interpret them without knowing that we are in wingover:
Sensor = 0 = constant speed
Sensor = +0.1 = model is accelerating, needs less power (hups, wrong)
Sensor = -0.5 = model is slowing down needs more power (hups, wrong again)
Other sensors:
Sensor in vertical axis say all the time 0 it can be sign of wingower, but it can be easily curved flight close to the ground, so it does not mean too much.
Sensor in lateral axis says from 3g to say 2g on top and then again 3g. Those 3g are also on begin and also on end of wingover and also in level flight – so question is how to recognize diving from level flight (or better that curved), because -0.5g longitudinal axis needs braking in diving but accelerating in level flight. Etc
And now take to the game the wind.
If you want realy know what the model does, you need 3 sensors for linear acceleration and 3 sensors for angular acceleration (or angular position). And only then comes the question when to add and when to subtract the power