What makes cargo weigh down boats?

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looking for a good website for reference with building a narrow boat?

Gravity

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The same thing that makes cloathes weigh down a person.

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what year did hms titanic sink?

uhhhh could it be the weight of the cargo??

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well, to answer your question, 2 things have the biggest impact
firstly, and not so obvious, is the density of the water. salty water has a highter density than fresh water, so this means that it is 'harder' for a ship to sink lower in salty water... this in turn means that you can load more cargo in salty water than fresh water. this is a subject that can get complicated very quickly but in essense you will see on every cargoship in the middle of the ship, near or on the waterline a circle with a line through it... thats how deep (how much draught) that ship is allowed to go (have) in salt water. if the ship is trading in places of fresh water (rivers and lakes etc) there will be lines coming off that cicle that will dictate how deep that ship can be loaded in fresh water - these markings are called 'Load Lines' and there are 1000's of places online you can find out about them...
As for the another factor there is a ship stability term called TPC - this stands for Tonnes Per Centimeter.
This is the amount of tonnes required to be loaded onto the ship to lower it 1 centemeter in the water. everyship has its own TPC value as it depends on the 'co-efficient of form' of the ship...ummm....basically the actual design of the ships hull will have an impact on how it settles in the water.... its a bit complicated but by finding out the density of the water the ship is in, and what the TPC of the ship is at that draught you will be able to calculate exactly how the cargo will weigh down the ship....
hmmm..... but obviously its gravity that weighs the ship down (counteracted by the force of buoyancy of the ship pushing up)

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