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Jan 12, 2023 · Sometimes adding weight in the wrong place will alter a boat’s CG or CB away from the ideal spot. Rough water, engine power, weather forecast, tide schedule, and wiggle room for all aboard to coexist should also play a part when configuring the layout of the load going on your boat to help the weight distribution.
gravity slightly downward and makes GM a little more positive, if you add the weight low in the boat about the same height as the designed center of gravity, or put so much weight in that the CG moves below the CB. If you put it higher than the existing CG it can have negative effects, actually making GM shorter and causing the boat to list more.
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Apr 10, 2012 · Draw a profile of a boat and put a dot where the CG would be. Trimmed up, the line of thrust runs under and forward of the CG and lifts the bow. Trimmed down, it runs above and behind the CG, lowering it. Advertisement. You can also compensate for load with trim tabs, correcting list caused by weight load by raising or lowering the boat on one ...
Jan 26, 2014 · The literature claims that this boat weighs 1200 lbs. A sister-ship was weighed on a highway scale and her weight was calculated to be 1710 lbs without outboard and gas tank, cruising gear, anchors, etc. The keel ballast is 300 lbs of lead. Now add an outboard motor on the transom, a gas tank and battery in the lazarette, and 2 adults in the ...
- By Steven K. Roberts Nomadic Research Labs April 27, 2002
- The Principle of Moments… A Few Cg Basics
- The Weight Study Database
- Using (and Enhancing) The Cg Database
I heard it from them all… every multihull marine architect who had ideas to contribute to the Microship project urged me, at one time or another, to do a weight study. Robb Walker… Gino Morrelli… John Marples… Jim Antrim… luminaries in the field, every one. Each informed me that a critical first step in designing a ship (or an airplane) is a thorou...
Every boat has a center of buoyancy (CB), which is the center of the underwater volume of the vessel. She also has a center of gravity (CG) which is where all the mass would be concentrated if it had to be compressed to a single point. If the boat is to float properly on her design waterline, then the CG must be in line vertically with the CB…. if ...
First, I need to make a quick comment on the implementation. It happens that I developed this database on a Macintosh under FileMaker Pro version 3.0, which was back around the turn of the century. None of this should matter much anyway, since you’ll doubtless want to configure the database to fit your own needs, using your own tools; by the time y...
Putting all this to use is easy… just start throwing stuff at it and watch the numbers converge! But it’s best to begin with the boat itself. This isn’t as hard as it sounds. You need a scale that can handle about half the weight of your boat. Follow these steps: 1. Weigh each end of the level boat, wherever and however convenient. 2. Note the exac...
Sep 13, 2017 · The weight (500 lbs.) is multiplied by the distance (2') for a moment of 1000 ft. lbs. Naturally this will tend to throw the hull out of balance and cause it to sink deeper at the stern while lifting the bow to some degree. Such a situation should be corrected if the boat is to perform as the designer intended.
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Jan 1, 2003 · It is called the capsize screening formula:Step 1: X = Sailing weight of boat (pounds) ÷ 64Step 2: Boat’s maximum beam (feet) ÷ cube root of X. The result will fall in the low single numbers. If the number is below two then total stability is similar to a boat with a capsize length above 30—deemed competent for sea.
