The Damping Coefficient of Roll for Patrol Boats

Abstract

In this paper the damping coefficient of roll for patrol boats engaged in Major Coasting Areas (generally, represented in N) has been investigated, and a method to obtain the damping coefficient of ship for any condition was presented, analysing results of tank experiments of nine models.
The mothod is ; first, a standard N for standard condition is obtained from a chart, (the N function of bilge keel size and C_??_ while d/B, KG/d₀ and K/B constant), then corrections for d/B, KG/d₀, K/B are done by properly prepared charts.
where C_??_= maximum sectional area coefficient of the ship d=draft of the ship
B=beam of the ship
KG=vertical position of center of gravity of the ship above base line d₀=standard draft
K=radius of gyration of the ship