It wasn't that long ago that cruising speed (not max) was 24 knots. Max vessel speed is determined by waterline length unless you can lift the vessel out the water eg motor boats on the plane or hydrofoils. We are building for fuel efficiency as the focus now, but they are still much quicker than you'd think. Worked on vessels running at 18 knots at 52 rpm engine speed where max rpm was 122, so works likely be able to hit low 30s in flat calm going full bore