As an engineer myself, I love graphs and data, but I read through the data from the original guy who did this a few years ago, and if you look at from a purely scientific standpoint, there are some flaws.
First, there is no mention of how everything is calibrated each time. How do you know the tension of the "test media" is the same? How do you know the "test media" itself is consistent from test to test?Do we know the scale is calibrated properly with each test?
Next, we all know there is quite a variation in manufacturing. It appears that he tested a very limited number of samples (in fact it appears to 1) of the blades. But even if he tested 20, that is still a fairly limited number of samples. The variation he is showing could easily be covered by manufacturing variation itself.
And the how representative is the test media to human hair? In ballistics testing they use a specific hell to as closely as possible represent a living organisms. This must also be considered as some media may more closely replicate hair than others.
Having said all of this, I am not trying to poopoo the study. I just merely point out there are flaws. I am an electrical engineer with over 20 years, quite a bit of which has been spent in protective relaying on industrial power systems. One of the best books ever written on the subject is called the Art and Science of Protective Relaying. As much science as there is in this field, there really is more art. I would suggest the same for shaving. I don't think that everything could be proven or fully supported with science. Some of the guys on here that hone their straights will be familiar with the hanging hair test. This is a test of a blades sharpness. But, my guess is that none of them will tell you this is a full indicator of a blades shavability (is this a word?). That comes more from feel.
I guess that I found for myself that I had to suspend a lot of my engineering, data focused thought process for this hobby as there seems to be quite a bit of Art to it. As
@jtspartan said, the more I shaved, the more I realized blades were one of the least impactful variables of the shave.
Click to expand...