Wings of Death is one of the few games that use "fake 60Hz" code which allows a ~60Hz display on PAL machines without needing the ECS Agnus chip. BC Kid and Dyna Blaster are two others like that.
I don't know what the exact frame rate for Wings of Death is. Apparently BC Kid is ~57Hz. Maybe WinUAE's AVI-writing code doesn't recognise the fake-60Hz modes???
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