[Bicycle Bob]

Originally Posted by freebeard

What thread to put this in? Interesting aerodynamics isn't for just the outside:


Just A Car Guy: Dimpling the intake ports has them picking up 8% more flow and and 5% more velocity

After it's 3D printed they could clean up with an extrude-hone.

That duct must dump into a disaster zone if it needs turbulent flow delivered. Dimples are wonderful on golf balls, but if your shape is not rotating, a simple thin ring about 35% back is all you need, and if you have anything much gentler than a round shape, you don't need turbulence to keep the flow attached.
Home-built instrumentation can be tricky, especially if there are expectations. I once built a manometer, and could not get anything close to an accurate reading, even on such a simple device.