FOD, I don't think CGB really needed that full explanation.
By "radius of curvature" do you mean "turn radius"? As to your calculation, a good attempt. It would all depend on what speed (TAS) the aircraft hits 9g. The higher that speed, the bigger the turn radius. At, say 450kts that would be about 2400 feet, so you weren't that far out - far enough to make a big difference when it comes to fighter comparison, though.
Good job there's some aircrew on here, innit?
