Backpacker... (sorry for delay don't have internet at home)
Cessna 152, Lycoming 4 cylinder, no catastrophic failure, no fuel blockage.
And, again, the prop definitely stopped and there indeed was NO fuel going to the cylinders - my student had turned it off.
(as anyone who has flown a C152 will know... you cannot see the fuel cock, you can only feel it... and as I cannot fathom any sane reason why my student would turn it off, I did not check it every two minutes.....)