Addition of weight to a vessel will ALWAYS __________.
A. reduce reserve buoyancy
B. increase righting moments
C. increase GM
D. All of the above
A. reduce reserve buoyancy
B. increase righting moments
C. increase GM
D. All of the above
Daily License Questions about Ship Stability and Trim: I just think people need to have some knowledge in their heads, professional or otherwise. After 2007 our world has changed due to the advent of Smart Phones. Retaining knowledge is like being able to play a musical instrument, if you do not use it you will lose it! The questions I post with will hopefully help you keep what you already know or remind you of what you should know. William E. George
A.
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ReplyDeleteThe only thing for sure is that adding weight to a vessel will increase its draft measured at the LCF. A vessel's DEPTH = its DRAFT + its FREEBOARD. The DEPTH will not change so an increase in DRAFT will decrease FREEBOARD. FREEBOARD is a direct measure of RESERVE BUOYANCY. Therefore A is the best answer.
ReplyDeleteFor choices B and C it all depends where the weight is added on the vessel. Most likely if added low it could increase the Righting Arm, GZ, as well as Metacentric Height, GM. On the other hand if the weight is added high it will reduce GZ and GM.
If GZ is reduced Righting Moment is reduced. Righting Moment = GZ x Displacement.
A. More weight will give you less “freeboard” reserve bouancy.
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