Actually I was not spinning at all. Just headed upside down to the ground.
I was playing around, Mid-War, heart shaped "V" map. I went straight up, full power, full left rudder trying to do a "Hammerhead" (probably wrong) and got into a flat, inverted spin, but no spin. I tried everything I could think of, except turn off Combat Trim (which I forgot to do). Nothing worked to escape it. I bailed and the plane fell on top of me! LOL!
La-7 will do it, too if I get too slow on landing, but not inverted.