[JulianEdgar]

Originally Posted by j-c-c

I didn't see enough info in the the video to agree with the stated conclusion of the test.

For example, the strakes seemed to have much wider spacing then is the norm, I am not convinced measuring pressure at a single point is reliable to ascertain what I think is really happening with the entire system, which is the goal (?), rather then a single point, and the two PW taped squares purpose was not explained. My assumption, they were the bases that held the strakes being tested, so they had an unknown thickness, and they likely disrupted the under airflow, like a spoiler would, and to what to degree, I don't know, but a test with no strakes and PW only, would have resolved that question, for that single point of air pressure test measurement.

You may well be right - and of course you can do some testing and make your own measurements. I don't have a monopoly on testing and posting results!