sorry i didnt come to the forum for a while because the thread hadn't had any activity.
How about a picture of your setup?
I cant post pictures as this is my setup at work. I'm allowed to use it for whatever but I doubt i can post pictures of the setup, work secrets i suppose.
1. Accuracy on absolute measures isn't that important if you can compare fans using the same measure that is consistent and reproducible.
The test is very reproducible, its a professionally calibrated and serviced wind tunnel.
Some Really Nice Fan tests
The issue with this test, is that the fans are just blowing into some random tunnel/enclosure which doesnt have a known back-pressure. If he was blowing the air through a certain heatsink at least you would know the airflow through that heatsink.
At least that's what it looked like to me.
You get zero back pressure by having a fan on the exhaust of the tunnel and having 0 mm/H20 pressure in the middle of the tunnel.
2. What you have done is very impressive. Please consider reposting this message here:
Good idea, i will post there shortly.
3. Have you done any testing since you posted this message?
I've done tests since then but I do them for work and few fans have looked worth testing. We use high-airflow high-pressure fans usually so I cant post anything you guys would be interested in. Although I tested one fan which had amazing airflow/pressure and 80 dBA! (We have an anechroic chamber but there is so much noise in the building it wont go below 30 dBA).