Maybe something cool actually exists. Something clever. I was actually thinking of an hydraulic ram but im not sure it's a good idea. Another thing i saw was a one-way check valve. Would this work?
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“Doesn’t need a battery *or* power” - it takes energy to move mass, sorry. What inputs *are* available? Human effort? – Jonathan R Swift Oct 24 '19 at 12:54
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How much water & how often, how big is the boat, what type of boat? Why not solar panels? Or a wind generator on top of the mast (assuming a sail boat)? – TimWescott Oct 24 '19 at 14:49
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You can buy a mechanical pump that you work by hand for this purpose. It has a cylinder with a piston inside, a suction hose, and a discharge hose. You dip the suction hose into the bilge water, aim the discharge hose overboard, and push the handle on the piston back and forth like a bicycle pump. This is called a manual bilge pump.
niels nielsen
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