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Originally Posted by davidzo
So there must be a point, where the friction inside the jets is bigger than the advantage of the jetcount (-> better waterdistribution all over the surface)."
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I will address this point though, purely because it is unfounded conjecture.
In the Cascade the length of the jet tubes accounts for around 2% of the block's total pressure drop. In the Storm, they account for around 4%.
Oh, but hey, when attempting to discredit work for commercial reasons, why should one stop to make sure that they have their facts straight before engaging the mouth.
The bulk of the pressure drop in
any jetted design is that of restricting/accelerating the water into the jets themselves. Once the water is accelerated inside a jet the pressure drop really is fairly minimal unless travelling 5cm or so, at which point it still only becomes significant, but not dominant, in comparison to the cost of getting the water into the jets in the first place.