Ship Maneuvering in Deep and Confined Waters 



Additional tests in the VBD Shallow Water Tank were ordered 

 in April 1966 to establish near-to-wall stiffness derivatives from 

 straight-line motion close to one of the vertical basin walls in "deep" 

 water. After a series of repeated tests with a modified recording 

 system the full captive model test programi was completed in April 

 1967. The test data are included in reports [98] and tables from 

 VBD, 



The test program is condensed in Table IV. It shall be ob- 

 served that no acceleration derivatives could be obtained from these 

 tests. Most of the force measurements were made at a model speed 

 of 0.465 m/s corresponding to a ship speed of 7.6 knots or 14 km/h. 



The ship prototype was a single- screw/single- rudder turbin 

 tanker of the Kockums 90 000 - 100 000 tdw series, delivered to the 

 owners in October 1965 for use in the crude oil trade through the 

 Suez Canal on a reduced draught. The main dimensions of ship and 

 1:70 scale model are given in Table V, and the body plan is shown in 

 Fig. 28, The prototype has a Mariner-type rudder, normal bow 

 and no bilge keels; a few tests were run to investigate the effects 

 of a bulbous bow and of bilge keels of common design. 



Fig. 28. Model of 98 000 tdw tanker -- body plan and profiles 

 Model tested on "Suez draught" 



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