Quote:
Originally posted by MadDogMe
But will it reach those speeds without the torque?, once the waters 'load' is added?...
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yea for sure when it's loaded up the speed will drop, but if it's doing 9700rpm with the bare hub in the water then if we aim for around 4000-5000rpm loaded up then we should be able to pump a reasonable amount of water.
here is a concept drawing of what I think will work;
blue is water passege, green is impeller , red is the 12v motor, the impeller is made up of 2 discs of 2'' in diameter, and about 1/12'' thick, with a similar gap between them, the disc closest to the intake has a hole in the middle, make this around the same dia as the intake, that disk can be attached to the main disk by a couple of pins or similar.
edit, forgot to add, this design is based on the principle that a centrifical pump works by spinning the water in the impeller chamber, which then forces it's way out of the tangental exit of the pump, which creates a vacume that sucks more water into the intake.
edit again, the impeller assembly of the high head iwaki pumps is very similar in principle to this, it's where I got the idea from.