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Old Nov 19, 2012, 08:22 PM
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So a larger pump turning at lower rpm would be the solution?
But how much larger? A 30 mm jet would have an crossectional area a of 7 cm² and my current one has a 20 mm impeller 3.14 cm ² logically then if its like plane props the massive 45% diameter increase would require 45% less pitch to maintain the same motor load?

With a plane prop pitch has an influence on max speed, I think the rule of thumb is
Plane_Kph = PitchInches * RPM / 800
Is there a similar calculation for water do you know?

On full size boats I have seen very big hulls with small outlet nozzels I assume this is to increase exit velocity of the water, could a larger slower turning pump and a smaller nozzel give better speed?
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