[bigben2k]

I was looking at being able to test heatercores, and I have one that's 6" by 8" (a bit larger than most). That puts the diameter of my wind tunnel at 32". That's more along the lines of what I expected.

I stopped by the local hardware store last night, and found a 12" concrete former: $9. Waxed cardboard. anything bigger would be harder to find.

Reviewing the documentation last night, I'm realizing how critical it is that everything is properly sealed (for the pressure drop measurements). Then I pondered about how good a cardboard tube would be, and concluded that waxing ought to do well, but that if there's a way to apply a better kind of coating instead, it wouldn't hurt.

I also gave some thought on maintaining a seal at the nozzle plate. If the nozzle plate needs to be interchangeable (I haven't determined that yet), then it would be best to cut the tube in two and put a flange, so that I can bolt the nozzle plate. The flange would also act as a support (on a small diameter setup).

Today I'm going to try to sum up the requirements (from all the links above) in a simpler list, and source a 32" diameter tube.


Did you get a quote from helandermetal yet?