Yesterday I decided to do some experiments in MA flying 190D9:
1 - With a slow N1K2 at my six (2000 yards) I decided to zoom in vertical. I saw the N1K2 aproaching very slowly in the vertical, at 800 yards the closure rate was almost 0 and I decided to keep vertical (while it was a suicide) and see what the N1K2 was going to do. I just hammered and dive nose down towards him, both crossed in the air guns cold but he was still nose up at the cross and he kept nose up after the cross. I saw no yawing effect on that N1K2, he leveled smoothly inverted and went away.
2 - I repeat that move later against another N1K2. This time I got shotdown after reversing, but the effect in the vertical was the same than case 1.
3 - At sea level a Spit dived on me, I was doing my top speed with wep at this altitude. The spit aproached fast till 500 yards, I just keep looking at my six for several seconds until I saw the first tracers, then a slight roll to the left and then to the right, spit was at 450 yards, still aproaching. Then, suddenly, closure rate inverted very fast, now I was gaining distance with the spit still at my six at 600, 650, 700 yards (I was all the time about 350mph). It seems to me that drag decceleration is whatever but linear with the spit.
4 - The past week I HOed a F6F flying 110G2, F6F was shot down but I lost all of my guns except one 151/20. I was surprised cause that alone gun had the same ROF as the root wing mounted ones of the 190s, and these are synchronized. 110G2 nose 20mm guns should have same ROF as the 109G10 one, AFAIK 110G2 nose guns are not synchronized. With all the guns, the effect is like firing with a single unsynchronized gun with very hi ROF, like if one gun fires just after the other generating a continuous bullet stream.