The US for example tested a captured Focke-Wulf with what I figure were very quite accurate results, except that for some reason, the engine kept cutting out at high altitude.
The test pilot for the FW-190:
1. Complains about aileron reversal and the tendancy to stall in the turns. Only in the Luftwaffe test and this test is any problem with ailerons in the turn. The RAF, which tested several different varients of 190's during the war, never mentions this characteristic. The RAF mentions stalling but never aileron reversal. That simply was not a characteristic of a properly serviced 190.
2. There was obvious engine problems. The motor fouled plugs at low speed and simply quit at altitude on several occasions. Probably did not like US AvGas. Powerloading does effect turn radius but not nearly as much as wingloading.
In those test's the FW-190 turn EXTREMELY badly. In fact there are only TWO tests' that mention aileron problems when turning. The USAAF tactical trails with an FW-190A5/U4 and the Luftwaffe Tactical trials of an FW-190A2 vs. Bf-109F4.
A P51 does turn with an F4U. An FW-190A turns with a P51B with the P51B having a "slight" advantage. Certainly not outturning it in a couple of turns. Yet the F4U and the Hellcat in these tactical trials easily outturned the FW-190.
In the FW-190A2 vs. Bf-109F4 tactical trials, it is specifically mentioned that the ailerons must be properly adjusted and the grip proof tips properly positioned. This has an adverse effect on low speed handling and causes premature stalling in the turns.
Check out the aileron comments on this website:
http://www.terra.es/personal2/matias.s/fw190.htm Now cross-reference that with the FW-190A5 condition on the USAAF tactical trials. Fairly extensive repairs were done to this A/C. It was a crashed and recovered A/C. I think the ailerons were out of adjustment.
Again, these two trials are the only mention of a problem with stalling in the turns.
Let me know if you need a copy of the USAAF tactical trials with the FW-190A5.
Crumpp