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RE: penny boat
The boat has to displace less then it's weight in water otherwise it wont float.
As long as weight < displacement weight it will float.
Now with that said, I built one last night that based off of the weight of pennies (arround .1 ounces) my boat could have held about 500 pennies, with just one peice of tinfoil somewhere near 30cm x 30cm. Just build a Bowl with a flat bottom and make sure when loading pennies that the weight distribution is even!
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