I believe it's something to do with the blades changing the air pressure affecting the temperature of the air causing condensation to form.
Hercules' are good at doing this. Normally when there is a bit of moisture around. I've got a pic somewhere that has it, but not as good as this. If I can find it I'll post it up.
Cheers guys, i have a few shots of Hercy birds with vortices, just never seen a whole plane going through one. Nice long ones on that shot b_1_rd.
Dean
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