Indeed, it's a very impressive speed. I have been on few ships of similar size as this sailboat. With their huge, extremely loud, hot, and diesel hunger engine

Indeed, it's a very impressive speed. I have been on few ships of similar size as this sailboat. With their huge, extremely loud, hot, and diesel hunger engine they usually cruise at less than 15 knots. Container ships are outliers. Not sure how much more fuel they burn when sailing at 25 knots vs 15 knots. But they use cheaper heavy oil so perhaps are less sensitive to fuel cost. Also the same speed feels faster at sea than on the land because waves make sailing like drive off-road. A small boat can feel like fly at 30 knots. 11 knots makes a joyful ride.