I don't know. I had the same question, and so I ran the test multiple times with a similar result. In any case, the difference is small, about .7 seconds difference to complete a 360. The difference looks large in the chart because of the Zscore scaling, i.e. a very large number of aircraft turn 360 degrees in +/- 18 seconds.
Here are the raw times to complete a 360 in sustained turn:
Oh, and before someone asks, I turned to the right with the XIV and Yaks, to the left with the rest.
just exactly how do you go about performing/flying to gather your test data for planes in the game? going by the highlighted bold lines I quoted you on, it looks as if you only are doing your test using 1 turn, maybe 2 turns tops........ are you using the stall limiter ( as has been the case by another gameplayer in the past, when he was doing a similar test )....
having differing fuel loads for the planes can skew the results as well........ they should be tested in the same setup of loadouts.not some with 75% and others with 50%......... using the same settings for all planes ie.... all at 25% or all at 50% etc...also setting the fuel burn to 0.0001 ( practically zero fuel burn ) so the weight remains constant, will give better results.........flying for a minimal of 3 complete turns ( I prefer minimal of 5 or minimal of 10 is even better ) and then doing an average by dividing the 3 / 5 / or 10 to get an average will be alot more accurate of what the actual test data shows, then just doing 1 or 2 turns.....
I am not trying to criticize your results...only trying to be more helpful........
also keeping your turning with as little of an altitude rise/drop say less than 50 ft (no more than 100 ft) will be even more accurate ..meaning the less altitude variance the better the data......
then have 2 or 3 others perform the same test, using the same procedures to cross reference......if 1 person has set data , but the 2 others are more in line with each other or vice versa. will show any potential mistakes in the data.....
If you have any questions, I am sure their are people in the game that will have no problems with offering you solid answers / suggestions ......
I have seen many people go forth and test......but their are maybe 4 or 5 tops I will not worry about when they post plane performance data from the game, and it is always best to post with your data what version & patch of the game the testing was done in........
YMMV......
hope this helps