Okay, happy with that - but I guess it prompts me to clarify what's meant by the stall in this case (I'll assume that we're looking at the tailplane upside-down, so that lift and angle of attack are positive):
- the tailplane is stalled if the elevator deflection is fixed - ie lift decreases rather than increases if the angle between airflow and chord is increased (which, from this point of view, makes the stick-fixed aircraft unstable in attitude, as observed); but nonetheless
- the lift increases as usual with elevator deflection. The increase in camber therefore wins over the increased effective angle of attack.
I guess I'm comparing this with the usual tale about ailerons being ineffective at the stall...
Windrusher