similar interesting optical visualisation of airflow around your tug propeller you can attain with good camera in winter cold, stable weather, see http://www.marecek.cz/image/201005240011_bb.jpg
Whole article describing details and more photos are at
http://www.marecek.cz/view.php?cisloclanku=2010052401
but the article is in language you are probably not familiar with :-).