dotsie,
The P-51D was given highspeed flaps, so that it could improve its turn. It was common for 51 drivers over Europe to drop flaps a notch as they were tailing a turning 109, giving them that extra degree of angle for the shot. It was advised that this setting be used only when it was needed, and raised again immediately afterward.
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leonid, aka grisha
129 IAP VVS RKKA