When I was first taking my PPL, my usual instructor, ( a great story on his own, i'll tell someday), was away on vacation and I had a rookie fresh off the board rookie instructor.
Well we were coming into the circuit via the crosswind leg in a 172. He had control. We were a little high and a little fast, he noses down for the downwind leg does a sharp 40 deg. turn with throttle down to enter downwind at proper alt. All goes fine, for us.
We hear over the radio another instructor prepaired for takeoff warn us that we just struck an ultralight...I didn't hear anything, nor did the instructor. When we land this dude with his JClarkes still on his head, wire dangling and a bloodied up face starts chasing around the instructor....it woulda been freakin hillarious , if it weren't so serious.
So i come to the aid of my instructor and ground the angry dude till he relaxes. It turns out we didn't hit him, but missed him by maybe a couple of feet. When my instructor nosed down during the turn, the ultralight was at proper alt and already on the downwind leg, oops. So the ultralight cops a facefull of dirty air , does two rolls, regains control just in time to pull up and do a slam landing in the grass strip adjacent to the tarmac. Busted up his plane , and his nose, so ya know why the dude was so mad. And I might add, if that ultralight guy wasn't 10 times the pilot my instructor was, this would have been a fatal accident.
Needless to say, that instructor had to find a new school to instruct at.
I bet that ultralight dude is just happy he doesn't have to sit in the big Officers Club in the sky and tell the story of how his pilot days came to an end by the 'propwash' from a Cessna 172.
fellow fliers, stay safe.