I just ran some more tests on the subject:
P-39D-1 with 75% fuel, Crimea map, noon, throttle 0% and pp 0%
I flew level at 2000 meters with the above settings, and when speed dropped to 190 km/h IAS I pulled back on the stick hard. When it stalled I centered the controls. Every time the aircraft entered a clockwise flat spin. I started the recovery actions after waiting 5 seconds. Recovery altitude, when that happened, was always between 850 and 650 meters.
Test 1: full counter rudder and stick forwards
Recovered 2/6 times
Test 2: full counter rudder, stick forwards and ailerons pro-spin
Recovered 6/6 times
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