Yup, I said you’re right. Although, I don’t think all of those are down right ugly. Some are just strange and others…the designers must still be wearing bell bottom pants and pin stripe jackets, no fashion sense. How the hell does that box with 2 x 6 planks for wings fly?
The tips of the prop blades are traveling so fast through the air (supersonic sometimes) that their frictional masses are compressing and heating the ambient air to the temperature needed (dew point) to create a cloud or vapor. It happens frequently in warm humid locations. I’ve actually seen it happen once on T/O in a PA34 back when I was flying in FL. Normal sight in the hot humid South.
its not the camera, its not longer than usual exposure, every other part of the plane is in sharp focus, and the background was in focus too, so he didnt pan the camera with the plane.
Heating air tends to increase the amount of water vapor it can hold, not cause the vapor to condense. The vortices are the result of the pressure being reduced.
Eatsleepjeep is correct. The visible vortex only appears at the tip, where the compressed air behind the propeller encounters the ambient air, causing a rapid expansion.
The same effect can be visible on the top surface of the entire wing during certain atmospheric conditions, notably a very narrow temp/dewpoint spread, so the effect is definitely caused by a low pressure.