"bill" == bill writes:

bill On Mon, 24 Oct 2005 12:50:20 -0500, "Jim Burns"
bill wrote:

Not the wingtip vortices, but prop wash vortices. On very
humid days, we can see them swirl past the cabin of our Aztec
on take off roll. I've also seen them many times watching crop
dusters take off. Jim


bill I've seen that as well, but it's visible from every angle.
bill It's essentially a small cloud created at the tip of the
bill prop.

This brings up a question. Why don't we experience the same
distortion all the time behind our single-engine props? Surely that
distortion would be more than what you saw, yet I've never noticed
anything like it. Maybe the distorted tube of air is too short (a few
feet) whereas your wingtip tube was many feet?