Nice films blitzn, just wanted to clairify why this works though. You obviously know how to use the displacement roll; however, your description is a bit off.
A displacement roll doesn't "slingshot yourself into his turn radius," it actually does the exact opposite. Another term for a displacement roll is a lag roll, this gives a clue as to what it's achieving. You are already starting well within your opponent's turn radius and you have two options. Due to the moderately high angle off created by the F4U's turn, you could just high yo-yo to stay within his turn radius but, in this film, one of two things would happen. You could just do a small yo-yo but that will put you too close to the F4U's tail and you can't match his turn radius so it'll set you up for an overshoot. The other possibility is a large yo-yo by pulling your nose up much higher to maintain adequate separation but, if the F4U is smart he'll pull vertical to match you and get you in a vertical scissors.
The best option is what you did, a lag roll. The lag roll actually starts the same as a high yo-yo but you roll AWAY from his turn (he's turning right, you're rolling left). Toward the end of the roll you align your fuselage and drop into a good lag position OUTSIDE of his turn radius and inside his control zone. Check your film here and look straight down at the fight and you'll see you're comfortably outside of his flight path. Because your turn radius is larger it allows you to maintain higher e without the danger of an in-close overshoot.
One other thing, you're absolutely right about the 190's roll rate helping you out here. If you're in a slow rolling plane it'll take longer to get into lag and allow the F4U to possibly gain too much separation or force you too far outside of his flight path. Either case will put you outside of the control zone letting the F4U to reverse and force a flat (or rolling) scissors.
Again, nicely done, just wanted to clairify the details.
