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Old 04-23-2006, 12:59 PM
sciencegirl2 sciencegirl2 is offline
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Red face submarines

i need help building a submarine that will float for 30 sec., then sink for 30 sec. and then float back up to the top with no help from anybody after you first put it in the water
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Old 04-25-2006, 04:04 PM
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SmartyC SmartyC is offline
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Lightbulb

Wow seems complicated, but I'm not the best in construction Well maybe if you build it out of a material that floats easily and on the inside put a timer. A timer and a lock, when 30 sec are up the lock will open and let the water fill the bladder. But see I really don't know how to do it, once my dad made something in that sort, but he had a ll these materials.

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Old 04-26-2006, 01:00 PM
JVG814 JVG814 is offline
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I had to do this....but i had to make it subsurface =/.
This is what i did, i made the bottle and put a long, flexible plastic straw in the bottle, duct taped to it tight ( i put it in a hole i made in the cap.) Then, i filled it with a liquid ( i used coke) and put it in the water with the coke can next to me. It floated. Here comes the gross part... I took the coke and pushed it through the straw with my mouth, making the bottle fill up with coke and sink, i then drank it back up, making it float again.
Good luck, i hope this works...it did with me.
-J
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