After seeing the helicopter under the fiery Kopps-Etchells effect, Gizmodo reader Carlos sent us his recent pictures of this Cobra helicopter slicing the air.
I took these a few months ago on base. It was so humid you can see the blades cutting the air producing a vortices.
You are probably familiar with this phenomenon. You can usually see vortex cores on the wingtips of fighter jets flying at high speed when there's water present. They also happen when rotors are moving at high speeds and the air humidity is very high. That's the case of that Cobra or this De Havilland C-115:
Next time you are flying a prop plane or a helicopter in this condition, watch out for this pretty effect.
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