Auto-prop, agree with Mike
I have an Autoprop on my Beneteau 393. In addition to increasing my sailing performance, which is probably clear from the design, the benefits motoring are real as well. I have a Yanmar 56hp. Going forward in Idle (800 rpm), I do about 2 knots, 1200 RPM I do 5.5 knots, real quiet like. At 2400 RPM I am doing over 7 knots. Normally I cruise at 1600 rpm, 6+ knots, and enjoy the quite rather then go faster ... I credit the Autoprop to making this possible. When docking she reponds real quick to going in reverse, and has more power than my standard prop. I also get quite prop-walk, which is helpful when docking.