Page 276 - Practical Ship Design

234 Chapter 8

Straight Stem Cylindrical Bow (for full Cb)

Faired-in Bulb Ram Bow "Added" Bulk with Knuckle

Ram Close to Waterline Deeply Submerged Ram Moor Deep Ram

Fig. 8.2. Various bow configurations.

manufacture and seems, on full lined ships, to give at least as good results as the
faired bulb.
The next division is between bulbs which project as rams significantly forward
of the fore perpendicular, and those with little or no such projection. Ram bows
also vary in the vertical positioning of the forward projection, which in some
designs commence near the waterline and in others are well submerged.
One of the principal criteria applied to the design of a bulbous bow is the
relationship that its sectional area at the fore perpendicular bears to the midship
section area.

8.2.3 Bows above the waterline
Above the waterline, bows are raked forward largely to conform with the flare of
the adjacent sections. Both rake and flare have as one of their objectives reducing