Video explains CoG effects.

[mark_009_vn]

Originally Posted by MaxGunz

The P-39 is balanced as they did. Mid-engine as opposed to front engine is about where the significant mass is located and what can be done with it, goes the same with cars too.

The P-39 should never enter a stall in a turn fully loaded, the problem with the P-39 regarding it's nasty spin characteristics is only when a large amount of 37 mm shells where expended, this caused a shift in CoG and only then would it become dangerous to do acrobatics.

Of course this is not modeled ingame for obvious reasons...