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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.
Apr 10, 2012 · The center of buoyancy (CB) is where the upward (floating) forces focus and should always line up vertically under the CG at rest. Where’s the CG? “On almost any planing hull you can just assume that the center of gravity and buoyancy is 60 to 65 percent aft of the bow,” explained Dave Gerr, noted naval architect and dean of the Westlawn Institute of Marine Technology.
CG shifts more outboard than the CB then the boat rolls over. The real solution is to change the design of the boat. Give it less of a vee, make it wider at the waterline, and move things in the boat so the CG is lower but CB is the same. But how do you fix an existing boat? The best solution is not to add weight. The best solution
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- 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...
Jan 26, 2014 · But basically, its a small boat, with a somewhat pinched waist. and no weight in the keel, She's going to hobbyhorse not much you can do about it. there's a reason more modern daysailer designs like the Viper use a vertical cb with a torpedo of weight at the bottom. 1) its lighter 2) its more RM for the same weight
Dec 22, 2007 · Adding weight to near the waterline also helps RM considerably! The metacenter is about 1 m above the waterline with this boat (at small heel angles). If we asume that the new keel has it's CG 1.7 m below waterline thus 2.7 m below M and the original 0.9/1.9, we get 2.7*450 = 1215 1.9*800=1520
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Sep 13, 2017 · Now for IMPORTANT POINT #2: If the two points (CB and CG) are NOT at the same position when your boat is out of the water and on its trailer, your boat will go down by the bow or stern and/or tilt or "list" to one side or the other once in the water until the two points DO align, even if this means NOT floating on a level plane.
