Originally Posted by Stumble
The reduction is actually in wave making resistance. Bulbous bows effect the same wave drag that defines hull speed
. In effect they act as noise
canceling headphones for the bow wave.
F = ma same cross section but the acceleration of the water
depends upon the displacing agents frontal form, section defines mass of water
displaced entry bluntness or fineness defines the acceleration. Most efficient is where mass by acceleration and skin friction from longer fine bow cross at the defined SOG as it were.