Really Cool Effect

[smoke665]

I'm not sure if using this little clip of a photo that isn't mine is allowed, if it isn't I apologize, but I wasn't quite sure how to explain the effect without a visual. Maybe some others have their own photo they can share. I've never seen the cork screw effect of a plane propeller so vividly illustrated as in this clip. I am assuming that the light rain at time of takeoff is what made the air current visible.

 

[dennybeall]

Could there have been some smoke devices placed on the propellers?

 

[smoke665]

Guess anything is possible, I just assumed it had to do with the rain.

 

[astroNikon]

high humidity

 

[wfooshee]

High humidity, for sure. Low pressure behind the prop blades condenses the water vapor onto visible moisture, the same way a fighter jet in a hard turn produces vapor over the wings, or even in a flat pass at very high speed. My own shot of the same aircraft in your sample:

If you're a motorsports fan, you'll sometimes see these little contrails off the wings on the back of the race cars. Not my image, so a link: Clicky!