In-depth
described simply in terms of Beaufort
scale (BN), the correction factor (α) for Table 1 Values of correction Factor α
block coeffi cient and Froude number, and
weather direction reduction factor (m).
C Condition α (correction factor)
B
Th e head weather formulae are derived
0.55 normal 1.7 - 1.4F - 7.4(F )
2
from calculations for containerships in
n n
their normal service condition and for
0.60 normal 2.2 - 2.5F - 9.7(F )
2
n n
tankers both laden and in ballast, thus
representing both fi ne and full forms.
0.65 normal 2.6 - 3.7F - 11.6(F )
2
n n
Th e percentage of speed loss is given by
0.70 normal 3.1 - 5.3F - 12.4(F )
2
n n
D�P�
'V
100%
0.75 laden or normal 2.4 - 10.6F - 9.5(F )
2

n n
V
0.80 laden or normal 2.6 - 13.1F - 15.1(F )
2
n n
Where:

0.85 laden or normal 3.1 - 18.7F + 28(F )
2
'
∆V speed loss due to head weather
V
n n
V design service speed
∆
V
V is the speed loss in head weather
0.75 ballast 2.6 - 12.5F - 13.5(F )
2
n n

V
given by equation (1)
0.80 ballast 3.0 - 16.3F - 21.6(F )
2
α is the correction factor for block
n n

'V
coeffi cient (C )and Frou
6
d
.5
e
0.85 ballast 3.4 - 20.9F + 31.8(F )
2
100% 0.5
B
n n
number(F ) give

BN
BN
V
n
2
in
.

7
T
�
ab2le/3 1
n
m is the weather direction reduction
factor given by equation(2)
Table 1. Values of correction Factor α.
'V
6.5
100%
BN
0.7BN 
2/3
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The Naval Architect March 2008 15
NA Mar 08 - p14+15+16.indd 15 10/03/2008 11:58:35
∆V
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