A weight of 350 tons is loaded on your vessel 85 feet forward of the tipping center. The vessel's MT1 is 1150 foot-tons. What is the total change of trim?
A. 12.93 inches B. 23.75 inches C. 25.87 inches D. 38.50 inches
A. 12.93 inches B. 23.75 inches C. 25.87 inches D. 38.50 inches
Change of Trim = Trimming Moment / MT1
ReplyDeleteTrimming Moment = Weight Loaded x Distance from the LCF
Trimming Moment= 350 tons x 85 feet fwd of LCF, to change of trim will be by the bow.
Trimming Moment = 29,750 ft-tons
Change of Trim = 29,750 ft-tons / 1,150 ft-tons/inch = 25.869 inches by the bow.
The best answer is Choice C.
Interesting the complete answer should also indicate the direction of the Change of Trim (FWD or AFT, by the Bow or by the Stern) not just the magnitude!
You can find out more about "Change of Trim Caused by Loaded or Discharged Weights" in STABILITY AND TRIM FOR THE SHIP'S OFFICER, 4th Edition, page 190 and 191.
So you need to know that the "tipping center" is another name for the vessel's LCF at a specific draft. In this case no draft was referenced so we cannot attempt to calculate the vessel's drafts.
I would rate this a rather straight forward License Exam Question. How would you rate it?
ReplyDeleteI agree George, C
ReplyDelete(w*d) / MT1
ReplyDelete(350*85) / 1150 = 25.86956
ANS= Charley is closest
good point about the tipping center is also called the LCF