The D airframe's length is too short in the FM numbers. By around a foot as I recall.
Historically the early D production blocks were indeed more unstable owing to the loss of fuselage area that was cut down to make it a bubble top. The later blocks had the new tail fillet that attempted to cure the problem. The early blocks had the fillet applied in the field.
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Personally speaking, the P-40 could contend on an equal footing with all the types of Messerschmitts, almost to the end of 1943.
~Nikolay Gerasimovitch Golodnikov
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