I wrote a "program" (if you will) whereby I can enter the voltage constant, no load current, internal resistance, and desired voltage (it also has an amp iterator which I arbitrarily started at 30I and ended at 100I).

I've checked the specs on the main players in r/c brushless (hacker, lehner, plett., etc.) and verified the aforementioned values and plugged them into my "calculator." You can find a grid w/ those values of the motors I listed (and many many many more) at the following link -> (http://www.motocalc.com/data/motor.html).

Interestingly you won't find the same values for Lehner motors. :( I'll hopefully be calculating at least the 2400XL in the very near future. Kinda funny that I've spent so much time looking into various motors but will end up purchasing a brand that seems to have an excellent name recognition for quality. Go figure.

Anywho, its really simple, just collect the motor constants for a given motor (see the link above) and complete the formula's on which you'd like more information.

For the most part all the information you need is out there (the web and search engines are the best thing ever)...well to at least make an educated decision. Including formula's for mass, velocity, and the like.

I've not played w/ my calculator in a while (I want to expand on it) due to work (being so darn busy)...like I am tonight posting on the forums. ;) With regards to expansion I want to integrate a gearing calc and mass/velocity calc into this to help find the elusive sweet spot.

Its geeky fun.