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Showing results for tags 'trim'.
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In response to a post about how much the draft and trim changes with an additional load, I wrote a program to calculate it. I though I would post it here, in case it is useful to anyone in future. The script is hosted in my public dropbox at https://dl.dropboxusercontent.com/u/14846300/boat_trim_calc.m and can be run in MATLAB or Octave or online using http://www.compileonline.com/execute_matlab_online.php. It uses Archimedes' principle and static equilibrium of forces and moments. Making a few assumptions (rectangular boat, small angles, no dynamic forces, etc.) and putting in boat dimensions, masses and the locations of those masses allows the draft at the bow and stern to be calculated. For example, if I add 600kg of water 2m from the bow of my 10 tonne, 15x2m boat, according to these calculations, the front goes down by 64mm and the back comes up by 24mm, which seems to correspond to reality. Also, by swapping the width and length values, I can look at how the roll angle changes with load. If I add a 60kg load at the extremity (e.g. me standing on the gunwhale) then the boat lists 12mm down at one side and 12mm up at the other. Hope this might be interesting to a few people. Regards, Joe
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Does anyone know where I can get pig iron or scrap railway line for ballast around Yorkshire? And roughly how much the stuff will cost? My barge used to have a large HiAb on the bow in her working life, so now its not there she sits very bow high!
