Tagit wrote: BM - a few considerations. I assume the bronze based pumps are for direct mounting to the hull. If you have an aluminium boat don't use one. If fiberglass or wood hull then fine. I assume that you will have something like a meter or so of head to the overflow point on your tubes? If so that drops a 1600gph pump to probably around 1200gph in a perfect world. Then split that between 2 tubes and you get maybe 600gph with perfect voltage and no parasitic drag on the pick up (they say not to use a scoop as it can damage the pump). Real world after bends in pipes and some pickup losses and allowing for the head etc you could easily be down around 20 - 25lpm for each tube and that doesn't sound like a lot to keep a half decent tuna alive. There are other calculations that suggest that you will get close to enough flow velocity over the tune to keep them alive with only 600gph per tube, but in our warmer conditions (lower oxygen levels) my feeling is that you will probably soon be wishing you had bought the bigger pump. |
Tagit wrote: I use 2 of these (3700) to feed 4 tubes and I wouldn't want any less. You may get away with less for 2 tubes but I think it will get marginal unless you only ever store small skippies. One thing to watch for on a trailer boat is that the pump current draw added to all your electronics etc may start to push the limits of your charging system at trolling speeds depending on what power plant you are running. |
Tagit wrote: What engine & hull do you have? Model and year? Some later gen outboards have alternators that get close to full output at modest rpms but some older ones don't produce a lot until you get the rpm's up. Should be able to get at least some basic specs online. |
Alan L wrote: Depending what motor you are running, (outboard?) it is specified with the motor - ie a query with the agent (model No ) will get you the answer. And there is usually a high output option which can be fitted. If inboard, then it will depend on the Gen specs - may be written on it? - rated in Amps. Alan |
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