This post is a bit more technical and more for other sailors interested in propellers. Hopefully it may come in handy someday for those with AutoProps, because there isn’t a whole lot of community info on them that I could find.
We have an AutoProp propeller on our boat. It’s like a MaxProp, which is also a feathering propeller, except that the AutoProp is also dynamically pitching – instead of a fixed, preset pitch, it changes its pitch to match operating conditions.
It’s really a very clever piece of engineering – dynamic pitch means that in theory it’s always at the optimal pitch for our speed and engine power. This mainly applies when motor-sailing (which is pretty common in the Northwest) – our sails can contribute some speed while the AutoProp contributes some as well, but allows our engine to work less hard – meaning lower engine RPMs, saving on fuel but getting the same power as a higher RPM.