While the MA went berserk with the server dumps, people migrated to the TA and we've had some extensive combat testings in the Ki-84.
Acceleration characteristics are superb. At take off roll the plane goes from 0 to 100 mph in 8 seconds. Overall between 0 to about 300 mph it boasts great accel, but the limited 324mph top speed at deck quickly takes over.
Roll characteristcs are poor. Pretty hard to manage even at moderate speeds, and a 360 degrees full roll under 200ft altitude over 300mph can cause deadly accidents.
Stability is excellent. The plane is very stable in all axises down to 200mph. Under 200mph, when it reaches about 165mph IAS the plane can use flaps. The increased efficiency of maneuvering at low-speeds with flaps are easy to tell, as it feels immediately different from other planes' flaps. Personally, I feel that the effects of the combat flaps on the Ki-84 are even more noticeable than the P-38 flaps.
Turning is also excellent. Overall the excellent stability helps greatly in turn fights. In a left turn a Ki-84 can follow and gain a firing solution against a Spit9 indefinately. After repeated mock combats against a Spit9 my conclusions are that the Ki-84 turns almost exactly the same, or very very marginally worse than the Spit9.
However, in a right turn, at low speeds, during stall/turn fights, this plane suffers serious stability issues.
While the plane will gently "mush" through impending stall signs such as roll axis destabilization and continue the turn if it is to the left, during a right turn it frequently meets destabilization and the plane keeps "tipping over" to the left, discontinuing the turn, due to stalls.
The structural durability is somewhat suspicious. Over 400mph IAS, at some point near 430 IAS-ish I believe, I've experienced numerous occasions where the ailerons, or the elevators ripped off. However, whenever a test was attempted to confirm its limits, the plane kept its parts even upto 475mph IAS during a dive.
Fuel endurance is excellent. More than 40 minutes flight time at deck at full power. This is noticeably longer than most fighters. At altitudes with slight decrease in RPM and throttle the flight time easily extends over 100 minutes.
Haven't done controlled dive tests yet, but my impression is its quite good.
