100 lb of Lead Vs 100 lb of concrete - Page 4 - SailNet Community

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  #31  
Old 04-22-2013
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Re: 100 lb of Lead Vs 100 lb of concrete

right... mass never changes. Even in the Microgravity of earth orbit. You could get a ton of weight moving slowly in orbit by yourself (if you had something to push against or an EVA thruster pack) but it could also crush you very slowly if it trapped you between it and something.
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  #32  
Old 04-22-2013
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Re: 100 lb of Lead Vs 100 lb of concrete

you guys are failing to mention th e lead as a biohazard. will raise your lead levels in blood and cause learning curve disorders--and agression increases.

concrete doesnt do that. is easier to obtain as it isnt a biohazard substance and wil not create learning curve dysfunction.

just add stuff to it as did the taiwanese when they made many boats with concrete keels--they added steel, lead chunks, whatever was in the yard that could be added.
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  #33  
Old 04-22-2013
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Re: 100 lb of Lead Vs 100 lb of concrete

encapsulated in your keel... lead is not going to hurt you. Sanding it, touching raw lead, or cutting it without proper biohazard precautions would bring about lead poisoning.. and that can take years to get over.

Concrete ships are nothing new. The US was playing with them in WW1. There is the remains of one off of Cape May NJ. The Atlantis. It was mothballed after the war and towed to Cape May to make a ferry terminal. Unfortunately it broke loose in a storm before it could be sunk in place and was blown ashore at Cape May Point where it has slowly deteriorated and sunk deeper into the sand.

Almost 100 years after she was launched, there is not a lot left.. but a lot more than if she had been built of steel
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Old 04-22-2013
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Re: 100 lb of Lead Vs 100 lb of concrete

Explanation of all the above and more at:

Stability of Boats and Ships



Buoyancy is imaginary
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Old 04-22-2013
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Re: 100 lb of Lead Vs 100 lb of concrete

Quote:
Originally Posted by mad_machine View Post
...

Concrete ships are nothing new. The US was playing with them in WW1. There is the remains of one off of Cape May NJ. ...
There's also one in Capitola, CA (just south of Santa Cruz, CA).
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Old 04-22-2013
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Re: 100 lb of Lead Vs 100 lb of concrete

I am going to have my next keel cast of gold so it doesn't create a bio hazard. It will be a very small boat!

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