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Daily Question for Feb. 7, 2018

For a small angle of heel to port, the center of buoyancy will __________.

A. move to port

B. move to starboard

C. move directly down

D. stay in the same position

Comments

  1. Yuri PantojaFebruary 7, 2018 at 7:38 AM

    LETTER A.

    There was a weight adition or a weight movement. So, if I move cargo to portside, my center of buoyancy will move portside too. If I move cargo to starboard, my center of buoyancy will move starboard too.

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  2. Friends of STABILITY AND TRIM FOR THE SHIP'S OFFICERFebruary 7, 2018 at 7:56 PM

    Yuri, You are confusing List and Heel when you justify your answer. "List" is caused by as you said the center of gravity, G, moving off the centerline of the vessel. When a vessel lists it is in equilibrium with B aligned with G such that the righting arm GZ = 0.

    The question asks about "Heel" which is caused by an external force acting on the vessel, for example a beam wind. In the case of a vessel heeling it will have a positive righting moment and righting arm such that B is acting upwards and G is acting downward with a horizontal separation known as GZ or righting arm. In this case B would move outboard and G would stay put. The best answer is A.

    ReplyDelete
  3. Friends of STABILITY AND TRIM FOR THE SHIP'S OFFICERFebruary 7, 2018 at 8:09 PM

    https://www.youtube.com/watch?v=mQRmgUg9So8

    ReplyDelete
  4. UnknownFebruary 7, 2018 at 10:17 PM

    Alpha; B moves toward the low side to form the "couple or righting arm" GZ.

    ReplyDelete

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