Dale Rogers wrote:

   In our application, there is less attenuation, but a 1.5 hp increase -
for just changing a contour in the inlet - is almost "free" power..

I especially liked how the author characterized the different contours. Just any ol' radius will get you most of the payback, but there are slight incremental improvements to be had with more manufacturing effort.  He makes it very easy to decide how much work you're willing to invest.

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