All I am saying is that using dimensional analysis can be a quick and easy way to compare speeds of gearboxes to previous designs assuming there is not a drastic change in speed. For example, our robot last year ran at a dimensionally calculated speed of 20 fps so by gearing a gearbox for 18 fps we get a slightly slower gearbox.
For me at least, 18 fps means nothing because I cannot actually visualize how fast that is just from the number. Using a previous reference point has been useful for me at least. If there is another way to visualize this I would really appreciate the information.
JVN's design calculator is great and I still use it occasionally, but I find that a quick calculation proves just as useful in many cases.
Sorry for the confusion,
Michael