You have said many times this new amp hog fan is the most efficient you have ever seen blah blah, I am not going to wade through all the thread posts to cite them. I don't spin anything but rotors
There are plenty of videos out there I am not going to do your work for you, go search yourself, I post my own up, that's good enough for me, I search when I want to see what other products do.
The Jetfan is a couple millimeters bigger diameter, certainly not something to use as an excuse, I wouldn't say it was not comparable to the Ramtec because it is, its not like its 135mm vs 127mm, its a couple mm and they were able to do that while keeping the Outside Diameter pretty much in line with the old 127mm style molded shrouds. As for the Ramtec its coming along nicely thank you, its rotor is incredibly tough out of the box, no need for masses of modifications and blade strengthening to ensure it doesn't blow apart, and once we have some new ESC's and the new sample motor I will be doing 18s tests too...