Originally Posted by
PW305
That photo is a great visualization of prop geometric efficiency (slip?), but how many of those blade tip vortices are actually spiraling around the fuselage?
Just observing from the plane I fly, I think it might be a lot. I fly a turbine powered spray plane and after a few hours of operation, soot from the exhaust is visible primarily on the right hand side of the fuselage and on the left horizontal stab and elevator. Not saying the rest of the plane is free from it, but definitely more on those areas.