ρw

mass density of water, from Table 4-1

=

Vc = current speed (m/s)

A p = propeller expanded blade area (m2)

propeller drag coefficient = 1.0

C PROP

=

θC

current angle (degrees)

=

A Tpp

A Tpp

=

EQUATION:

(22)

Ap =

1.067 - 0.229 (p / d)

0.838

for an assumed propeller pitch ratio of p / d = 1.0

LwL B

EQUATION:

(23)

A Tpp =

AR

major vessel groups are given in Table 4-7.

91

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