Originally Posted by aelkin
I think you picked up something on your prop.
Seaweed, a plastic bag, or something else on the prop can cause the engine to labour, which does not allow it to achieve 'normal' RPM.
While you were playing with it, the boat was still slipping along with the prop still (or idly spinning, or FOLDING?) and the whatever it was fell off.
Is this a possible scenario given the waters you were in at the time?
I thought of that but I would have thought that the engine would have changed it tone in some way as I advanced the throttle.
Idle was noticable. 15% was noticeable but their was no change is sound from 15% to 100% throttle position.
I'm leaning to casing came adrift in the binnacle and eventually got jammed enough to work.