A few weeks back i was driving the Stretch of River from Wroxham to Coltishal
I arrived at Colltishal, with the engine juddering, seemed it needed more power to maintain the same revs.
I lifted the outdrive to find the prop jammed up with weeds.
A Quick full power, in reverse and then forward, saw all the weeds shredded into Lentil Soup.
On the way back the prop jammed up about 3 times. I'm no expert on this, but it either sounds as if the prop is wrapped up in something ?