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I have a water pump coming from spark fun http://www.sparkfun.com/products/10455 it is 350 GPH
I am planning on attaching this to a large plastic container (tub) to make a robotic boat. I wondering if
there is any way to figure out how much weight I can put on the boat before the pump does not have
 enough power to move it.
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Maine
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I have a water pump coming from spark fun http://www.sparkfun.com/products/10455 it is 350 GPH
I am planning on attaching this to a large plastic container (tub) to make a robotic boat. I wondering if
there is any way to figure out how much weight I can put on the boat before the pump does not have
 enough power to move it.

You're going to want to take a look at http://www.homebuiltrovs.com/. They have done some testing in this area using this test stand: http://www.homebuiltrovs.com/teststand.html. We used a similar pump, but converted it to use a 30mm propeller. It moved our ~90lb ROV at roughly 1.5mph.
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"Anyone who isn't confused really doesn't understand the situation."

Electronic props for Airsoft, paintball, and laser tag -> www.nightscapetech.com

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