The P-40E is very susceptible to cross-control induced accel stalls. Agressive combinations of multi-axis control inputs, especially involving cross-control of the rudder, will dump you in a heartbeat at any speed. For me, it was almost always the left wing that dropped. You have to be extra smooth, which is already important in a ride with such poor E recovery. When slow, it will give you a wing bobble that warns you that you have crossed the edge, but when you are fast, you might not notice it telling you to stop. I so rarely got mine going fast that I can't say. I know Dedalos (along with many others) is much better than I in the P-40E, so listen to him/them.