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.