CHAPTER 11
Michael G. Parsons
PARAMETRIC DESIGN
11.1 NOMENCLATURE
AM
submerged hull section area amidships (m2)
AP
after perpendicular, often at the center of the
rudder post
AW
area of design waterplane (m2)
AX
maximum submerged hull section area (m2)
B
molded beam of the submerged hull (m)
BMT
transverse metacenteric radius (m)
BML
longitudinal metacenteric radius (m)
C
coefficient in Posdunine’s formula, equation 5;
straight line course Stability Criterion
C
distance aft of FP where the hull begins its rise
from the baseline to the stern (m)
CB
block coefficient = ∇/LBT
CBD block coefficient to molded depth D
CB’
block coefficient at 80% D
CDWT total deadweight coefficient = DWTT /∆
CI
transverse waterplane inertia coefficient
CIL
longitudinal waterplane inertia coefficient
CM
midship coefficient = AM/BT
Cm
coefficient in non prime mover machinery
weight equation, equation 42
Co
outfit weight coefficient = Wo/LB
CP
longitudinal prismatic coefficient = ∇/AXL
CS
wetted surface coefficient = S/√(∇L)
C∇
volumetric coefficient = ∇/L3
CVP
vertical prismatic coefficient = ∇/AWT
CWP waterplane coefficient = AW/LB
CX
maximum transverse section coefficient
= AX/BT
D
molded depth (m)
Der
depth to overhead of engine room (m)
DWTC cargo deadweight (t)
DWTT total deadweight (t)
E
modified Lloyd’s Equipment Numeral,
equation 33
Fn
Froude number = V/√(gL), nondimensional
FP
forward perpendicular, typically at the stem at
the design waterline
FS
free surface margin as % KG
F∇
volumetric Froude number = V/√(g∇1/3)
g
acceleration of gravity (m/s2); 9.81 m/s2
GMT transverse metacentric height (m)
GML longitudinal metacentric height (m)
hdb
innerbottom height, depth of doublebottom (m)
hi
superstructure/deckhouse element i height (m)
K
constant in Alexander’s equation, equation 14;
constant in structural weight equation
circle K
traditional British coefficient = 2F∇√π
KB
vertical cen