To clear things up on DokGonzo's site:
All the turn data comes from the list I did in 2006. The Spit 9 data was incorrect, Karnak spotted that in my thread here on Mosq's Sustained Turn List 2012. Also, as I recall, DokGonzo imported some of the Spit data incorrectly from my raw data spreadsheet. I'll have to re-check his charts to be sure.
The low level acceleration testing is also from my spreadsheet of 2006. The weapons data came from Hammer. BTW, if you haven't seen Hammer's Net Aces web pages it's worth looking thru at
http://www.netaces.org click the Site menu on the left.
So yes, DokGonzo's site is useful, but out of date.
And on the discussion of the KI-84 vs Spit 16, once full flaps are out on both planes they both turn the same radius (well there's a 1.5 ' difference, but I did the testing and I assure you that is within experimental error either way!), but the Ki-84 is turning 2.4 degrees faster in rate, so eventually it will go all the way around the circle and be behind the Spit. They are so closely matched that it really comes down to the pilot that flies perfectly vs the one who makes just the slightest, momentary mistake.